Updated on 2024/07/10

写真a

 
Sakuda Atsushi
 
Organization
Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology Associate Professor
School of Engineering Department of Applied Chemistry
Title
Associate Professor
Affiliation
Institute of Engineering
Contact information
メールアドレス

Position

  • Graduate School of Engineering Division of Science and Engineering for Materials, Chemistry and Biology 

    Associate Professor  2022.04 - Now

  • School of Engineering Department of Applied Chemistry 

    Associate Professor  2022.04 - Now

Degree

  • 博士(工学) ( Osaka Prefecture University )

Research Areas

  • Nanotechnology/Materials / Inorganic compounds and inorganic materials chemistry

Research Interests

  • Ionic Conductor

  • All-Solid-State Batteries

  • Materials Chemistry

  • 正極活物質

  • 常温加圧焼結

  • 固体電解質

  • All-solid-state batteries

  • メカノケミカル法

Research subject summary

  • 次世代電池材料の研究

  • 全固体電池材料の研究

Professional Memberships

  • 日本化学会

    2018.01 - Now   Domestic

  • 固体イオニクス学会

    2014.03 - Now   Domestic

  • 日本セラミックス協会

    2013.01 - Now   Domestic

  • 電池技術委員会

    2012.06 - Now   Domestic

  • 電気化学会

    2007.03 - Now   Domestic

Committee Memberships (off-campus)

  • 第64回電池討論会 実行委員   電池技術委員会  

    2023.03 - 2023.12 

  • 電気化学会編集委員   公益社団法人電気化学会 編集委員会  

    2022.03 - Now 

  • 役員(事務局長補佐)   日本セラミックス協会ガラス部会   

    2020.04 - 2022.03 

  • 関西電気化学研究会 世話人   電気化学会関西支部  

    2019.04 - Now 

  • 役員   日本セラミックス協会関西支部  

    2019.04 - Now 

  • 企画委員会委員   日本セラミックス協会関西支部  

    2019.04 - Now 

  • ガラス技術シンポジウム ワーキンググループ委員   ガラス産業連合会(GIC)  

    2019.04 - 2020.03 

  • 第60回ガラスおよびフォトニクス材料討論会 事務局補佐   日本セラミックス協会ガラス部会  

    2019.04 - 2019.12 

  • 第44固体イオニクス討論会 実行委員会委員   日本固体イオニクス学会  

    2018.04 - 2018.12 

  • 第59回電池討論会 実行委員   電池技術委員会  

    2018.01 - 2018.12 

  • 電気化学会第83回大会 実行委員   電気化学会  

    2016.03 

  • 第54回電池討論会 実行委員   電池技術委員会  

    2013.04 - 2013.12 

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Awards

  • 優秀教育賞

    作田 敦

    2024.03   大阪公立大学教育後援会  

  • 2023 Bimonthly Most Downloaded Papers Ranked 3rd for Electrochemistry(From November to December 2023)

    2024.01   “Electrode Potentials Part 1: Fundamentals and Aqueous Systems”

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    Country:Japan

  • 電池技術委員会賞

    2023.11   電気化学会  

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    Country:Japan

    「アルジロダイト型固体電解質前駆溶液を用いた全固体電池材料の開発」

  • Professor Vittorio Gottardi Memorial Prize 2023

    Atsushi Sakuda

    2023.11   International Commission on Glass  

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    Country:Germany

  • 2023 BIMONTHLY MOST DOWNLOADED PAPERS Ranked 2nd for Electrochemistry (from March to April 2023)

    2023.05   “Positive Electrode Performance of All-Solid-State Battery with Sulfide Solid Electrolyte Exposed to Low-Moisture Air”

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    Country:Japan

  • 2022 ANNUALLY MOST DOWNLOADED PAPERS Ranked 10th for Electrochemistry

    2023.01   "AC Impedance Analysis of the Degeneration and Recovery of Argyrodite Sulfide-Based Solid Electrolytes under Dry-Room-Simulated Condition"

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    Country:Japan

  • 2022 BIMONTHLY MOST DOWNLOADED PAPERS Ranked 2nd for Electrochemistry from March to April 2022

    2022.05   "AC Impedance Analysis of the Degeneration and Recovery of Argyrodite Sulfide-Based Solid Electrolytes under Dry-Room-Simulated Condition"

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    Country:Japan

  • 令和2年度科学技術分野の文部科学大臣表彰 若手科学者賞

    2020.04   文部科学省  

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    Country:Japan

  • 2019年度電気化学会論文賞(Electrochemistry)

    2020.03   電気化学会  

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    Country:Japan

  • 第7回大阪府立大学TT-netワークショップポスター賞

    2019.10   大阪府立大学テニュアトラック推進会議  

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    Country:Japan

  • Best Poster Award

    2019.06   The 22nd International Conference on Solid State Ionics(SSI-22)  

  • 進歩賞(佐野賞)

    2019.03   電気化学会  

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    Country:Japan

  • 進歩賞

    2018.06   日本セラミックス協会  

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    Country:Japan

  • 倉田 元治 賞

    2013   日本セラミックス協会  

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    Country:Japan

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Papers

  • Utilizing Reactive Polysulfides flux Na2Sx for the Synthesis of Sulfide Solid Electrolytes for All-Solid-State Sodium Batteries Reviewed

    A. Nasu, T. Otono, T. Takayanagi, M. Deguchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    Energy Storage Materials   67 ( (103307) )   1 - 9   2024.03

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1016/j.ssi.2024.116479

  • Tuning the Ionic and Electronic Path in Li2S-based Cathode for High-Rate Performance All-Solid-State Lithium-Sulfur Batteries Reviewed

    W. Pan, T Watanabe, T. Matsunaga, M. Kumar, N. Thakur, K. Yamamoto, M. Uesugi, A. Takeuchi, A. Sakuda, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    Solid State Ionics   406 ( (116479) )   1 - 8   2024.03

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1016/j.ssi.2024.116479

  • Crystal Structure and Ionic Conductivity of Na2MnP2S6 Reviewed

    H. B. Yahia, K. Motohashi, S. Mori, A. Sakuda and A. Hayashi

    J. Phys. Chem. C   2024.02

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.jpcc.4c00311

  • NaTaCl6: Chloride as the End-Member of Sodium-Ion Conductors Reviewed

    K. Motohashi, H. Tsukasaki, A. Sakuda, S. Mori and A. Hayashi

    ACS Materials Lett.   6   1178 - 1183   2024.02

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acsmaterialslett.3c01445

  • An Electron/Ion Dual Conductive Integrated Cathode Using Cationic/Anionic Redox for High-Energy-Density All-Solid-State Lithium-Sulfur Batteries Reviewed

    W. Pan, K. Yamamoto, T. Matsunaga, T Watanabe, M. Kumar, N. Thakur, T. Uchiyama, M. Uesugi, A. Takeuchi, A. Sakuda, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    Batteries & Supercaps   7 ( e202300427 )   1 - 8   2024.01

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1002/batt.202300427

  • Na6Ge2S6O-Ionic Conductor: Synthesis, Structure and Ionic Transportation Reviewed

    H. Ben Yahia, K. Motohashi, S. Mori, A. Sakuda and A. Hayashi

    Solid State Ionics   403 ( 15(116412) )   1 - 7   2023.11

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1016/j.ssi.2023.116412

  • An Electron/Ion Dual Conductive Integrated Cathode Using Cationic/Anionic Redox for High-Energy-Density All-Solid-State Lithium-Sulfur Batteries Reviewed

    W. Pan, K. Yamamoto, T. Matsungaga, T. Watanabe, M. Kumar, N. Thakur, T. Uchiyama, M. Uesugi, A. Takeuchi, A. Sakuda, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    Batteries & Supercaps   e202300427   1 - 8   2023.10

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1002/batt.202300427

  • Metal Polysulfides as High Capacity Electrode Active Materials -Toward Superior Secondary Batteries Based on Sulfur Chemistry Reviewed

    S. Sakuda

    Electrochemistry   91 ( 10(102003) )   1 - 10   2023.10

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    Kind of work:Single Work  

    DOI: https://doi.org/10.5796/electrochemistry.23-00030

  • 3D Observation Using TEM Tomography of Solid Electrolyte-Electrode Interface in All-Solid-State Li-ion Batteries Reviewed

    S. Oshiro, H. Tsukasaki, H. Nakajima, K. Sakamoto, Y. Hayashi, A. Sakuda, A. Hayashi and S. Mori

    J. Solid. State. Electrochem.   online   1 - 5   2023.10

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1007/s10008-023-05714-4

  • Improving the Electrochemical Performance of Li2S Cathodes based on Point Defect Control with Cation/Anion Dual Doping Reviewed

    W. Pan, K. Yamamoto, N. Machida, T. Matsunaga M. Kumar, N. Thakur, T. Watanabe, A. Sakuda, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    J. Mater. Chem A   11 ( 45 )   24637 - 24643   2023.10

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1039/d3ta05426h

  • Mechanochemical Synthesis and Characterization of K2+xZr1-xYxCl6: Potassium-Ion-Conducting Chloride Reviewed

    Y. Okada, A. Nasu, T. Kimura, H. Tsukasaki, S. Mori, H. Ben Yahia, K. Motohashi, A. Sakuda and A. Hayashi

    Chem. Mater.   35 ( 18 )   7422 - 7429   2023.09

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.chemmater.3c00185

  • Mechanism Exploration of Li2S-Li2O-LiI Positive Electrodes with High Capacity and Long Cycle Life via TEM Observation Reviewed

    J. Ding, Y. Fujita, H. Tsukasaki, H. Nakajima, A. Sakuda, A. Hayashi and S. Mori

    ACS Appl. Energy Mater.   6 ( 18 )   9737 - 9742   2023.09

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acsaem.3c01858

  • Crystallization Process of Li3PS4 Investigated by X-ray Total Scattering Measurement and the Reverse Monte Carlo Method Reviewed

    M. Yoshimoto, T. Kimura, A. Sakuda, C. Hotehama, Y. Shiramata, A. Hayashi and K. Omote

    Solid State Ionics   401 ( (116361) )   1 - 8   2023.09

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1016/j.ssi.2023.116361

  • High-Frequency Impedance Spectroscopic Analysis of Argyrodite-Type Sulfide-Based Solid Electrolyte upon Air Exposure Reviewed

    Y. Morino, H. Sano, S. Kawaguchi, S. Hori, A. Sakuda, T. Takahashi, N. Miyashita, A. Hayashi and R. Kanno

    J. Phys. Chem. C   127 ( 37 )   18678 - 18683   2023.09

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.jpcc.3c03766

  • Structural Investigation of Li2O-LiI Amorhous Solid Electrolytes Reviewed

    Y. Fujita, T. Kimura, M. Deguchi, K. Motohashi, A. Sakuda, M. Tatsumisago, H. Tsukasaki, S. Mori, K. Ikeda, K. Ohara, N. Kuwata and K. Amezawa and A. Hayashi

    J. Phys. Chem. C   127 ( 30 )   14687 - 14693   2023.07

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.jpcc.3c03876

  • Mechanochemical Synthesis and Characterization of Na3-xIn1-xZrxCl6 Solid Electrolyte Reviewed

    Y. Okada, T. Kimura, K. Motohashi, A. Sakuda and A. Hayashi

    Electrochemistry   91 ( 7(077009) )   1 - 5   2023.07

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.5796/electrochemistry.23-00054

  • Hydrogen Components of a Sulfide-based Argyrodite-Type Solid Electrolyte after Moisture Exposure Reviewed

    Y. Morino, H. Sano, T. Takahashi, N. Miyashita, A. Sakuda and A. Hayashi

    J. Phys. Chem. C   127 ( 28 )   13616 - 13622   2023.07

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.jpcc.3c02143

  • High-Packing-Density Electrodes by Self-forming Ion Conduction Pathway During Charge Process for All-Solid-State Lithium Ion Batteries Reviewed

    K. Yamamoto, Y. Xiao, T. Watanabe, A. Sakuda, M. Takahashi, W. Pan, K. Nakanishi, T. Matsunaga, M. Uesugi, A. Takeuchi, K. Uesugi, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    J. Phys Chem. C   127 ( 30 )   14656 - 14665   2023.07

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.jpcc.3c02851

  • Fabrication of Li Metal-Sulfide Solid Electrolyte Interface Using Ultrasonic-Assisted Fusion Welding Process Reviewed

    H. Kitaura, E. Hosono, M. Otoyama, T. Takeuchi, K. Kuratani, M. Suyama, M. Deguchi, H. Kowada, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Phys. Chem. C   127 ( 26 )   12477 - 12483   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.jpcc.3c02277

  • Preparation of Li4GeO4-Li3VO4 based Electrolytes via Mechanochemical Treatment Reviewed

    C. Okushima, Y. Yoneda, T. Kimura, K. Motohashi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Ceram. Soc. Jpn.   131 ( 6 )   141 - 145   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.2109/jcersj2.23014

  • Crystal Structure Changes of thio-LISICON Electrolytes in Humid Atmosphere Reviewed

    T. Kimura, T. Nakano, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Ceram. Soc. Jpn.   131 ( 6 )   166 - 171   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.2109/jcersj2.23015

  • Synthesis and Ionic Conductivity of an Argyrodite-type Li6SbS5I Electrolyte Reviewed

    T. Kimura, R. Izawa, C. Hotehama, K. Fujii, A. Sakuda, M. Yashima, M. Tatsumisago and A. Hayashi

    Solid State Ionics   399 ( (116287) )   1 - 6   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1016/j.ssi.2023.116287

  • Ex situ TEM Observations of the SnB2O4 Glass Electrode in All-Solid-State Lithium-Ion Batteries after Charge-Discharge Process Reviewed

    H. Tsukasaki, K. Sakamoto, Y. Hayashi, H. Nakajima, T. Kimura, A. Sakuda, A. Hayashi and S. Mori

    Solid State Ionics   399 ( (116288) )   1 - 7   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1016/j.ssi.2023.116288

  • Mechanochemical Synthesis and Structure of the Alkali Metal Magnesium Chalcogenide Na6MgS4 Reviewed

    H. Ben Yahia, K. Motohashi, A. Sakuda and A. Hayashi

    Inorg. Chem.   62 ( 26 )   10440 - 10449   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acs.inorgchem.3c01415

  • Stack Pressure Dependence of Li Stripping/Plating Performance in All-Solid-State Li Metal Cells Containing Sulfide Glass Electrolytes Reviewed

    T. Asakura, T. Inaoka, C. Hotehama, H. Kowada, K. Motohashi, A. Sakuda, M. Tatsumisago and A. Hayashi

    ACS Appl. Mater. Interfaces   15 ( 26 )   31403 - 31408   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acsami.3c03552

  • Stabilizing High-Temperature α Li3PS4 by Rapidly Heating the Glass Reviewed

    T. Kimura, T. Inaoka, R. Izawa, T. Nakano, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Am. Chem. Soc.   145 ( 26 )   14466 - 14474   2023.06

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/jacs.3c03827

  • Nanoscale Coexistence of Polar-Nonpolar Domains Underlying Oxygen Storage Properties in Ho(Mn, Ti)O3+δ Reviewed

    H. Nakajima, K, Uchihashi, H, Tsukasaki, D. Morikawa, H. Tanaka, T. Furukawa, K. Kurushima, J. Yamasaki, H. Ishibashi, Y. Kubota, A. Sakuda, A. Hayashi and S. Mori

    Phys. Rev. Research   5 ( 2(023203) )   1 - 7   2023.06

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    DOI: https://doi.org/10.1103/PhysRevResearch.5.023203

  • Spectroscopic Investigation of Li3PS4 LiI Sulfide-Based Glass-Ceramic Solid Electrolytes after Moisture Exposure Reviewed

    Y. Morino, H. Sano, K. Kawamoto, H. Higuchi, N. Yamamoto, A. Matsuda, K. Fukui, A. Sakuda and A. Hayashi

    J. Phys. Chem. C   127 ( 25 )   12342 - 12348   2023.06

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    DOI: https://doi.org/10.1021/acs.jpcc.3c02399

  • Unique Li Deposition Behavior in Li3PS4 Solid Electrolyte Observed via Operando X-ray Computed Tomography Reviewed

    J.H. Park, T. Watanabe, K. Yamamoto, T. Uchiyama, T. Takami, A. Sakuda, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    Chem. Commun.   59   7799 - 7802   2023.05

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    DOI: https://doi.org/10.1039/d2cc05224e

  • Twinned Single Crystal Structure of Li4P2S6 Reviewed

    H. Ben Yahia, K. Motohashi, S. Mori, A. Sakuda and A. Hayashi

    Z. Kristallogr   238 ( 5-6 )   1 - 8   2023.05

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    DOI: https://doi.org/10.1515/zkri-2023-0013

  • Synthesis, Structure and Properties of Na4GeS4 Reviewed

    H. Ben Yahia, K. Motohashi, S. Mori, A. Sakuda and A. Hayashi

    J. Alloys Compd.   960 ( (170600) )   1 - 8   2023.05

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    DOI: https://doi.org/10.1016/j.jallcom.2023.170600

  • Tin Interlayer at the Li/Li3PS4 Interface for Improved Li Stripping/Plating Performance Reviewed

    T. Inaoka, T. Asakura, M. Otoyama, K. Motohashi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Phys. Chem. C   127 ( 22 )   10453 - 10458   2023.05

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    DOI: https://doi.org/10.1021/acs.jpcc.3c01740

  • Surface Degeneration of Li3PS4-LiI Glass-Ceramic Electrolyte by Exposure to Humidity-Controlled Air and Its Recovery by Thermal Treatment Reviewed

    H. Sano, Y. Morino, Y. Matsumura, K. Kawamoto, H. Higuchi, N. Yamamoto, A. Matsuda, H. Tsukasaki, S. Mori, A. Sakuda and A. Hayashi

    Electrochemistry   91 ( 5(057004) )   1 - 7   2023.05

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    DOI: https://doi.org/10.5796/electrochemistry.23-00029

  • Crystalline/Amorphous LiCoO2-Li2SO4 Nanoheterostructured Materials for High-Voltage All-Solid-State Lithium Batteries Reviewed

    T. Hakari, M. Deguchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Power Sources   562 ( 1(232739) )   1 - 7   2023.04

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    DOI: https://doi.org/10.1016/j.jpowsour.2023.232739

  • Degradation of an Argyrodite-type Sulfide Solid Electrolyte by a Trace of Water: A Spectroscopic Analysis Reviewed

    Y. Morino, H. Sano, K. Kawamoto, K. Fukui, M. Takeuchi, A. Sakuda and A. Hayashi

    Solid State Ionics   392 ( (116162) )   1 - 7   2023.04

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    DOI: https://doi.org/10.1016/j.ssi.2023.116162

  • Vacancies Introduced during the Crystallization Process of the Glass-Ceramics Superionic Conductor, Na3PS4, Investigated by Neutron Total Scattering and Reverse Monte Carlo Method Reviewed

    K. Ikeda, T. Kimura, K. Ohara, T. Sato, H. Ohshita, A. Sakuda and A. Hayashi

    J. Phys. Chem. C   127 ( 13 )   6199 - 6206   2023.03

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    DOI: https://doi.org/10.1021/acs.jpcc.3c00414

  • High Capacity Li2S-Li2O-LiI Positive Electrodes with Nanoscale Ion-Conduction Pathways for All-Solid-State Li/S Batteries Reviewed

    Y. Fujita, A. Sakuda, Y. Hasegawa, M. Deguchi, K. Motohashi, D. Jiong, H. Tsukasaki, S. Mori, M. Tatsumisago and A. Hayashi

    Small   19 ( 2302179 )   1 - 9   2023.03

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1002/smll.202302179

  • Positive Electrode Performance of All-Solid-State Battery with Sulfide Solid Electrolyte Exposed to Low-Moisture Air Reviewed

    Y. Morino, H. Sano, A. Shiota, K. Kawamoto, T. Takahashi, N. Miyashita, A. Sakuda and A. Hayashi

    Electrochemistry   91 ( 3(037005) )   1 - 4   2023.03

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    DOI: https://doi.org/10.5796/electrochemistry.23-00003

  • Hard Carbon–Sulfide Solid Electrolyte Interface in All-Solid-State Sodium Batteries Reviewed

    W. Yoshida, A. Nasu, K. Motohashi, M. Tatsumisago, A. Sakuda and A. Hayashi

    Electrochemistry   91 ( 3(037009) )   1 - 4   2023.03

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    DOI: https://doi.org/10.5796/electrochemistry.23-00009

  • Lithium Ion Transport Environment by Molecular Vibrations in Ion-Conducting Glasses Reviewed

    H. Yamada, K. Ohara, S. Hiroi, A. Sakuda, K. Ikeda, T. Ohkubo, K. Nakada, H. Tsukasaki, H. Nakajima, L. Temleitner, L. Pusztai, S. Ariga, A. Matsuo, J. Ding, T. Nakano, T. Kimura, R. Kobayashi, T. Usuki, S. Tahara, K. Amezawa, Y. Tateyama, S. Mori and A. Hayashi

    Energy Environ. Mater.   0 ( (e12612) )   1 - 10   2023.02

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1002/eem2.12612

  • Hydration and Dehydration Behavior of Li4SnS4 for Applications as a Moisture-Resistat All-Solid-State Battery Electrolyte Reviewed

    T. Kimura, T. Nakano, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Phys. Chem. C   127 ( 3 )   1303 - 1309   2023.01

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    DOI: https://doi.org/10.1021/acs.jpcc.2c06593

  • Vacancy-Stabilized Superionic State in Na3-xSb1-xWxS4 Reviewed

    S.-I. Nishimura, A. Hayashi, A. Sakuda and A. Yamada

    ACS Appl. Energy Mater.   5 ( 11 )   14053 - 14058   2022.11

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acsaem.2c02627

  • 電極電位測定の基礎と実際~水系・非水系・固体系~(その2)

    松本 一彦, 宮崎 晃平, 黄 珍光, 山本 貴之, 作田 敦

    関西電気化学テキストシリーズ   2022.2 ( 0 )   23 - 42   2022.10

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  • 電極電位測定の基礎と実際~水系・非水系・固体系~(その1)

    松本 一彦, 宮崎 晃平, 黄 珍光, 山本 貴之, 作田 敦

    関西電気化学テキストシリーズ   2022.2 ( 0 )   1 - 22   2022.10

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  • Ionic Conductivity and Microstructure of Li4GeO4-Based Solid Electrolytes Reviewed

    J. Ding, H. Tsukasaki, H. Nakajima, Y. Yoneda, T. Kimura, A. Sakuda, A. Hayashi and S. Mori

    Mater. Trans.   63 ( 10 )   1390 - 1395   2022.10

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    DOI: https://doi.org/10.2320/matertrans.MT-M2022094

  • Li2S-V2S3-LiI Bifunctional Material as the Positive Electrode in the All-Solid-State Li/S Battery Reviewed

    T. Shigedomi, Y. Fujita, T. Kishi, K. Motohashi, H. Tsukasaki, H. Nakajima, S. Mori, M. Tatsumisago, A. Sakuda and A. Hayashi

    Chem. Mater.   34 ( 21 )   9745 - 9752   2022.10

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    DOI: https://doi.org/10.1021/acs.chemmater.2c02645

  • Electrode Potentials Part 1: Fundamentals and Aqueous Systems Reviewed

    K. Matsumoto, K. Miyazaki, J. Hwang, T. Yamamoto and A. Sakuda

    Electrochemistry   90 ( 10(102001) )   1 - 9   2022.10

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    DOI: https://doi.org/10.5796/electrochemistry.22-66075

  • Electrode Potentials Part2: Nonaqueous and Solid-State Systems Reviewed

    J. Hwang, T. Yamamoto, A. Sakuda, K. Matsumoto and K. Miyazaki

    Electrochemistry   90 ( 10(102002) )   1 - 8   2022.10

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    DOI: https://doi.org/10.5796/electrochemistry.22-66088

  • Thermally Stable Bulk-type All-Solid-State Capacitor with a Highly Deformable Oxide Solid Electrolyte Reviewed

    T. Hakari, S. Yoshimi, K. Nagao, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Power Sources   543 ( (231821) )   1 - 8   2022.09

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    DOI: https://doi.org/10.1016/j.jpowsour.2022.231821

  • Iron Sulfide Na2FeS2 as Positive Electrode Material with High Capacity and Reversibility Derived from Anion-Cation Redox in All-Solid-State Sodium Batteries Reviewed

    A. Nasu, A. Sakuda, T. Kimura, M. Deguchi, A. Tsuchimoto, M. Okubo, A. Yamada, M. Tatsumisago and A. Hayashi

    18 ( 42 )   2203383-1 - 2203383-9   2022.09

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    DOI: https://doi.org/10.1002/smll.202203383

  • Mechanochemical Synthesis of Na3NbS4 Metastable Phase as Positive Electrode Materials for All-Solid-State Sodium Batteries Reviewed

    A. Nasu, A. Sakuda, M. Tatsumisago and A. Hayashi

    130 ( 9 )   789 - 793   2022.09

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    DOI: https://doi.org/10.2109/jcersj2.22056

  • Amorphous Positive Electrode Materials Prepared Using LiMn1.5Ni0.5O4 and Lithium Oxyacid Salts Reviewed

    N. Kwon, A. Nasu, A. Sakuda, M. Tatsumisago and A. Hayashi

    Chem. Lett.   51 ( 8 )   815 - 818   2022.08

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    Kind of work:Joint Work  

    DOI: https://doi.org/10.1246/cl.220132

  • Ionic Conduction of Glasses and their Potential Applications Reviewed

    Y. Daiko, A. Sakuda, T. Honma and A. Hayashi

    J. Ceram. Soc. Jpn.   130 ( 8 )   552 - 557   2022.08

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    DOI: https://doi.org/10.2109/jcersj2.22035

  • Li2S-LiI Solid Solutions with Ionic Conductive Domains for Enhanced All-Solid-State Li/S Batteries Reviewed

    Y. Fujita, T. Hakari, A. Sakuda, M. Deguchi, Y. Kawasaki, H. Tsukasaki, S. Mori, M. Tatsumisago and A. Hayashi

    ACS Appl. Energy Mater.   5 ( 8 )   9429 - 9436   2022.08

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    DOI: https://doi.org/10.1021/acsaem.2c00978

  • Preparation and Characterization of Na2.88Sb0.88W0.12S4-xOx Solid Electrolyte Reviewed

    T. Takayanagi, A. Nasu, F. Tsuji, K. Motohashi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Ceram. Soc. Jpn.   130 ( 7 )   498 - 503   2022.07

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    DOI: https://doi.org/10.2109/jcersj2.22017

  • Room-Temperature Preparation of All-Solid-State Lithium Batteries Using TiO2 Anodes and Oxide Electrolytes Reviewed

    H. Usui, Y. Domi, S. Izaki, A. Nasu, A. Sakuda, A. Hayashi and H. Sakaguchi

    J. Phys. Chem. C   126 ( 25 )   10320 - 10326   2022.06

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    DOI: https://doi.org/10.1021/acs.jpcc.2c02497

  • Lithium-Ion Conductivity and Crystallization Temperature of Multicomponent Oxide Glass Electrolytes Reviewed

    K. Nagao, M. Shigeno, A. Inoue, M. Deguchi, H. Kowada, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Non-Cryst. Solids: X   14 ( (100089) )   1 - 8   2022.06

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    DOI: https://doi.org/10.1016/j.nocx.2022.100089

  • Na2S-NaI Solid Solution as Positive Electrode in All-Solid-State Na/S Batteries Reviewed

    Y. Fujita, A. Nasu, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Power Sources   532 ( (231313) )   1 - 6   2022.06

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    DOI: https://doi.org/10.1016/j.jpowsour.2022.231313

  • Sodium-Ion Conducting Solid Electrolytes in the Na2S-In2S3 System Reviewed

    K. Motohashi, A. Nasu, T. Kimura, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi

    Electrochemistry,   90 ( 6(067009) )   1 - 5   2022.06

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    DOI: https://doi.org/10.5796/electrochemistry.22-00037

  • Crystalline Precursor Derived from Li3PS4 and Ethylenediamine for Ionic Conductors Reviewed

    T. Kimura, A. Ito, T. Nakano, C. Hotehama, H. Kowada, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Sol-Gel. Sci. Technol.   104 ( 3 )   627 - 634   2022.05

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    DOI: https://doi.org/10.1007/s10971-022-05824-x

  • Formation of Passivate Interphases by Na3BS3-Glass Solid Electrolytes in All-Solid-State Sodium-Metal Batteries Reviewed

    A. Nasu, T. Inaoka, F. Tsuji, K. Motohashi, A. Sakuda, M. Tatsumisago and A. Hayashi

    ACS Appl. Mater. Interfaces   14 ( 21 )   24480 - 24485   2022.05

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    DOI: https://doi.org/10.1021/acsami.2c05090

  • Studies on the Inhibition of Lithium Dendrite Formation in Sulfide Solid Electrolytes Doped with LiX(X=Br,I) Reviewed

    S.H. Yang, M. Takahashi, K. Yamamoto, K. Ohara, T. Watanabe, T. Uchiyama, T. Takami, A. Sakuda, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    Solid State Ionics   377 ( (115869) )   1 - 7   2022.04

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    DOI: https://doi.org/10.1016/j.ssi.2022.115869

  • Mechanochemical Synthesis of Amorphous MoSx (x=3,4,5,6, and 7) Electrode for All-Solid-State Sodium Battery Reviewed

    G. Shirota, A. Nasu, M. Deguchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Ceram. Soc. Jpn.   130 ( 4 )   308 - 312   2022.04

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    DOI: https://doi.org/10.2109/jcersj2.21177

  • Characterizing the Structural Change of Na3PS4 Solid Electrolytes in a Humid N2 Atmosphere Reviewed

    T. Nakano, T. Kimura, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Phys. Chem. C   126 ( 17 )   7383 - 7389   2022.04

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    DOI: https://doi.org/10.1021/acs.jpcc.2c00421

  • Mechanochemically Prepared Highly Conductive Na2.88Sb0.88W0.12S4-NaI Composite Electrolytes for All-Solid-State Sodium Battery Reviewed

    T. Takayanagi, A. Nasu, F. Tsuji, A. Sakuda, M. Tatsumisago and A. Hayashi

    Electrochemistry   90 ( 4(047005) )   1 - 5   2022.04

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    DOI: https://doi.org/10.5796/electrochemistry.22-00016

  • AC Impedance Analysis of the Degeneration and Recovery of Argyrodite Sulfide-Based Solid Electrolytes under Dry-Room-Simulated Condition Reviewed

    H. Sano, Y. Morino, A. Yabuki, S. Sato, N. Itayama, Y. Matsumura, M. Iwasaki, M. Takehara, T. Abe, Y. Ishiguro, T. Takahashi, N. Miyashita, A. Sakuda and A. Hayashi

    Electrochemistry   90 ( 3(037012) )   1 - 4   2022.03

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    DOI: https://doi.org/10.5796/electrochemistry.22-00013

  • Molybdenum Polysulfide Electrode with High Capacity for All-Solid-State Sodium Battery Reviewed

    G. Shirota, A. Nasu, M. Deguchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    Solid State Ionics   376 ( (115848) )   1 - 7   2022.03

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    DOI: https://doi.org/10.1016/j.ssi.2021.115848

  • Mechanochemical Synthesis of Pyrite Ni1-xFexS2 Electrode for All-Solid-State Sodium Battery Reviewed

    G. Shirota, A. Nasu, A. Sakuda, M. Deguchi, K. Motohashi, M. Tatsumisago and A. Hayashi

    Electrochemistry   90 ( 3(037011) )   1 - 6   2022.03

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    DOI: https://doi.org/10.5796/electrochemistry.22-00007

  • Synthesis of an AlI3-doped Li2S Positive Electrode with Superior Performance in All-Solid-State Batteries Reviewed

    H. Gamo, T. Maeda, K. Hikima, M. Deguchi, Y. Fujita, Y. Kawasaki, A. Sakuda, H. Muto, N.H.H. Phuc, A. Hayashi, M. Tatsumisago and A. Matsuda

    Mater. Adv.   3 ( 5 )   2488 - 2494   2022.02

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    DOI: https://doi.org/10.1039/D1MA01228B

  • Liquid-Phase Synthesis of Li3PS4 Solid Electrolyte Using Ethylenediamine Reviewed

    A. Ito, T. Kimura, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Sol-Gel. Sci. Technol.   101 ( 1 )   2 - 7   2022.01

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    DOI: https://doi.org/10.1007/s10971-021-05524-y

  • High Rate Capability from a Graphite Anode through Surface Modification with Lithium Iodide for All-Solid-State Batteries Reviewed

    S.H. Yang, K. Yamamoto, X.H. Mei, A. Sakuda, T. Uchiyama, T. Watanabe, T. Takami, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    ACS Appl. Energy Mater.   5 ( 1 )   667 - 673   2022.01

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    DOI: https://doi.org/10.1021/acsaem.1c03166

  • Solid Electrolyte with Oxidation Tolerance Provides a High-Capacity Li2S-Based Positive Electrode for All-Solid-State Li/S Batteries Reviewed

    T. Hakari, Y. Fujita, M. Deguchi, Y. Kawasaki, M. Otoyama, Y. Yoneda, A. Sakuda, M. Tatsumisago and A. Hayashi

    Adv. Funct. Mater.   32 ( 5(2106174) )   1 - 13   2022.01

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    DOI: https://doi.org/10.1002/adfm.202106174

  • Characteristics of a Li3BS3 Thioborate Glass Electrolyte Obtained via a Mechanochemical Process Reviewed

    T. Kimura, A. Inoue, K. Nagao, T. Inaoka, H. Kowada, A. Sakuda, M. Tatsumisago and A. Hayashi

    ACS Appl. Energy Mater.   5 ( 2 )   1421 - 1426   2022.01

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    DOI: https://doi.org/10.1021/acsaem.1c02452

  • In situ observation of the deterioration process of sulfide-based solid electrolytes using airtight and air-flow TEM systems

    Hirofumi Tsukasaki, Keisuke Igarashi, Akiko Wakui, Toshie Yaguchi, Hiroshi Nakajima, Takuya Kimura, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi, Shigeo Mori

    Microscopy   70 ( 6 )   519 - 525   2021.12( ISSN:2050-5698

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    Sulfide-based solid electrolytes (SEs) exhibiting high ionic conductivity are indispensable battery materials for next-generation all-solid-state batteries. However, sulfide-based SEs have a major drawback in their low chemical stability in air. When exposed to H2O or O2 gas, toxic H2S is generated, and their ionic conductivity considerably declines. However, their degradation mechanism caused by air exposure has not been understood yet. To clarify the degradation process, in this study, we developed a transmission electron microscope (TEM) system to evaluate the air stability of battery materials. Using a vacuum transfer double-tilt TEM holder with a gas-flow system, the in situ observation of the degradation process was conducted for a sulfide-based Li4SnS4 glass ceramic under an air-flow environment. Consequently, electron diffraction (ED) patterns and TEM images could clearly capture morphological changes and the amorphization process caused by air exposure. Moreover, based on the analysis of ED patterns, it is observed that Li4SnS4 is likely to decompose because of the reaction with H2O in air. Therefore, this airtight and air-flow TEM system should be effective in clarifying the process of the deterioration of sulfur-based SEs during exposure to air.

    DOI: 10.1093/jmicro/dfab022

    PubMed

  • Development, Structure, and Mechanical Properties of Sulfide Solid Electrolytes Reviewed

    K. Ohara, A. Sakuda and A. Hayashi

    Encyclopedia of Materials: Technical Ceramics and Glasses   3   38 - 48   2021.12

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  • Crystallization behaviors in superionic conductor Na<inf>3</inf>PS<inf>4</inf>

    Hiroshi Nakajima, Hirofumi Tsukasaki, Jiong Ding, Takuya Kimura, Takumi Nakano, Akira Nasu, Akihiko Hirata, Atsushi Sakuda, Akitoshi Hayashi, Shigeo Mori

    Journal of Power Sources   511   2021.11( ISSN:0378-7753

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    All-solid-state batteries using sodium are promising candidates for next-generation rechargeable batteries due to the limited lithium resources. A practical sodium battery requires an electrolyte with high conductivity. Cubic Na3PS4 exhibiting high conductivity of over 10−4 S cm−1 is obtained by crystallizing amorphous Na3PS4 synthesized by ball milling. Amorphous Na3PS4 crystallizes in a cubic structure and then is transformed into a tetragonal phase upon heating. In this study, in situ observation by transmission electron microscopy demonstrates that the crystallite size drastically increases during the transition from the cubic phase to the tetragonal phase. Moreover, an electron diffraction analysis reveals that amorphous domains and nano-sized crystallites coexist in the cubic Na3PS4 specimen, while the tetragonal phase contains micro-sized crystallites. The nano-sized crystallites and the composite formed by crystallites and amorphous domains are most likely responsible for the increase in conductivity in the cubic Na3PS4 specimens.

    DOI: 10.1016/j.jpowsour.2021.230444

  • Mechanochemical synthesis and characterization of Na<sub>3-x</sub>In<sub>1-x</sub>Zr<sub>x</sub>Cl<sub>6</sub> solid electrolytes

    岡田侑也, 木村拓哉, 作田敦, 林晃敏

    電池討論会PDF要旨集(CD-ROM)   62nd   2021.09( ISSN:0378-7753

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    All-solid-state sodium batteries are attracting attention as next-generation batteries, owing to their improved safety and abundance of sodium resources. To realize all-solid-state sodium batteries, solid electrolytes with high sodium-ion conductivities are required. In this study, Na3PS4 electrolytes with partial substitution of P5+ with W6+ were investigated. The Na3–xP1–xWxS4 sulfide-based solid electrolytes were prepared via a mechanochemical process and consecutive heat treatment. The Na2.85P0.85W0.15S4 electrolyte with Na vacancies exhibited an ionic conductivity of 8.8 × 10−3 S cm−1 at 25 °C, which was higher than that of Na3PS4 solid electrolyte. The all-solid-state batteries (Na-Sn/Na2.85P0.85W0.15S4/TiS2) exhibited a reversible capacity of 140 mA h g−1 at a current density of 0.038 mA cm−2 and retained the capacity of 115 mAh g−1 for 40 cycles at 0.130 mA cm−2 at 25 °C. The Na3–xP1–xWxS4 samples prepared via mechanochemistry are homogeneous electrolytes free of crystalline WS2 impurities and are effective for application to all-solid-state sodium batteries.

    DOI: 10.1016/j.jpowsour.2021.230100

    J-GLOBAL

  • Crystallization Behaviors in Superionic Conductor Na3PS4 Reviewed

    H. Nakajima, H. Tsukasaki, J. Ding, T. Kimura, T. Nakano, A. Nasu, A. Hirata, A. Sakuda, A. Hayashi, S. Mori

    Jounal of Power Sources 雑誌   511 ( 230444 )   1 - 7   2021.08

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  • Investigation of the suppression of dendritic lithium growth with a lithium-iodide-containing solid electrolyte

    Masakuni Takahashi, Toshiki Watanabe, Kentaro Yamamoto, Koji Ohara, Atsushi Sakuda, Takuya Kimura, Seunghoon Yang, Koji Nakanishi, Tomoki Uchiyama, Masao Kimura, Akitoshi Hayashi, Masahiro Tatsumisago, Yoshiharu Uchimoto

    Chemistry of Materials   33 ( 13 )   4907 - 4914   2021.07( ISSN:0897-4756

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    Publishing type:Research paper (scientific journal)  

    All-solid-state lithium batteries that use lithium metal as the anode have extremely high energy densities. However, for lithium metal anodes to be used, lithium dendrite formation must be addressed. Recently, the addition of lithium iodide (LiI) to sulfide solid electrolytes was found to suppress lithium dendrite formation. It is unclear whether the cause of this suppression is the improvement of the ionic conductivity of the solid electrolyte itself or the electrochemical properties of the lithium metal/solid electrolyte interface. In this study, the cause of the suppression was quantitatively elucidated. The effect of the interphase on the dendrite growth of doping LiI into Li3PS4 was determined using X-ray absorption spectroscopy and X-ray computed tomography measurements. The results revealed that LiI-doped Li3PS4 suppressed the dendrite formation by maintaining the interface due to inhibition of the reductive decomposition of Li3PS4. In addition, annealed LiI-doped Li3PS4 showed a greater dendrite suppression ability as the ionic conductivity increased. From these results, we not only found that the physical properties of the lithium metal/solid electrolyte interface and the bulk ionic conductivity contribute to lithium dendrite suppression but also quantitatively determined the proportions of the contributions of these two factors.

    DOI: 10.1021/acs.chemmater.1c00270

  • Structures and conductivities of stable and metastable Li<inf>5</inf>GaS<inf>4</inf>solid electrolytes

    Takuya Kimura, Chie Hotehama, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    RSC Advances   11 ( 41 )   25211 - 25216   2021.07

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    Publishing type:Research paper (scientific journal)  

    Understanding the differences in the structures and defects in the stable crystalline phase and metastable phase is important for increasing the ionic conductivities of a solid electrolyte. The metastable phase often has higher conductivity than the stable phase. In this study, metastable lithium thiogallate, Li5GaS4, was synthesizedviamechanochemistry and stable Li5GaS4was obtained by heating the metastable phase. The metastable Li5GaS4sample was found to have an antifluorite-type crystal structure with cationic disorder, while the stable phase was found to have a monoclinic crystal structure, similar to that of another solid electrolyte, Li5AlS4. In both the structures, the Ga3+cations were surrounded by four S2−anions in tetrahedral coordination. The conductivity of the metastable phase was determined to be 2.1 × 10−5S cm−1at 25 °C, which is 1000 times greater than that of the monoclinic phase. The high conductivity of the metastable phase was achieved owing to cation disorder in the crystal structure.

    DOI: 10.1039/d1ra03194e

  • Glassy oxide electrolytes in the system Li<inf>4</inf>SiO<inf>4</inf>Li<inf>2</inf>SO<inf>4</inf> with excellent formability

    Yohei Yoneda, Chie Hotehama, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of the Ceramic Society of Japan   129 ( 7 )   458 - 463   2021.07( ISSN:1882-0743

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    Publishing type:Research paper (scientific journal)  

    All-solid-state batteries using oxide electrolytes are regarded as safe batteries. However, most crystalline oxide solid electrolytes require high-temperature sintering for densification. Oxide electrolytes with high formability, which enable the construction of high-performance batteries, are thus required. In this study, Li4SiO4Li2SO4 glasses and glass-ceramics were prepared by mechanochemical treatment and subsequent heat treatment at 270 °C to achieve electrolytes with high formability. As the Li2SO4 content was increased, the formability of the electrolyte increased. The 90Li4SiO4·10Li2SO4 glass-ceramic electrolyte with a hexagonal structure (a P63/mmc space group) showed the highest ionic conductivity of 2.2 © 1016 S cm11 at 25 °C. In this crystal structure, oxygen anions form a hexagonal close-packed structure, and silicon and sulfur cations randomly occupy the tetrahedral sites formed by oxygen anions. An all-solid-state LiIn/LiNi1/3Mn1/3Co1/3O2 cell using a 90Li4SiO4·10Li2SO4 glass-ceramic electrolyte operated at 100 °C as a secondary battery without high-temperature sintering. These oxide materials are promising solid electrolytes for oxide-type all-solid-state batteries.

    DOI: 10.2109/jcersj2.21027

  • Glassy Oxide Electrolytes in the System Li4SiO4-Li2SO4 with Excellent Formability Reviewed

    Y. Yoneda, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi

    Journal of the Ceramic Society of Japan 雑誌   129 ( 7 )   458 - 463   2021.07

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  • Amorphous Li2O-LiI Solid Electrolytes Compatible to Li Metal Reviewed

    Y. Fujita, Y. Kawasaki, T. Inaoka, T. Kimura, A. Sakuda, M. Tatsumisago and A. Hayashi

    Electrochemistry 雑誌   89 ( 4 )   334 - 336   2021.07

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  • Microstructure and Charge-Discharge Mechanism of a Li<inf>3</inf>CuS<inf>2</inf>Positive Electrode Material for All-Solid-State Lithium-Ion Batteries

    Tomoji Ayama, Hirofumi Tsukasaki, Yusuke Kawasaki, Hiroshi Nakajima, Masahiro Tatsumisago, Atsushi Sakuda, Akitoshi Hayashi, Shigeo Mori

    ACS Applied Energy Materials   4 ( 6 )   6290 - 6295   2021.06

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    To develop all-solid-state lithium batteries, high-capacity positive electrode materials are necessary. An antifluorite-type material, Li2S, exhibits a high theoretical capacity. However, Li2S cannot be used as a positive electrode for the all-solid-state cell because of its insulating behavior. To provide electronic and ionic conduction, recently, antifluorite-type Li3CuS2 has been developed by activation of Li2S by Cu substitution. Li3CuS2 is a favorable candidate for positive electrodes as sulfide-based all-solid-state cells with Li3CuS2 exhibit high charge-discharge performance. However, structural changes and redox species during the charge-discharge cycle have not been understood yet. To clarify the charge-discharge mechanism of Li3CuS2, in this study, we examined the microstructural changes in a Li3CuS2-Li3PS4 positive electrode composite during charge and discharge by transmission electron microscopy (TEM). The hollow-cone dark-field imaging technique was employed to evaluate the crystallite size distribution. The result shows that the crystallite size of Li3CuS2 reversibly decreases and increases in the charging and discharging states, respectively. The electron diffraction pattern shows that LiCuS2 was formed during charging, which is attributed to Li+ extraction from Li3CuS2. In the discharging state, the crystallite size increased and Li3CuS2 was reproduced. The TEM results suggest that the reversible structural changes (Li3CuS2 ⇆ LiCuS2 + 2Li+ + 2e-) would contribute to high charge-discharge characteristics.

    DOI: 10.1021/acsaem.1c01074

  • Solid electrolytes Na10+xSn1+xP2-xS12 prepared via a mechanochemical process

    Fumika TSUJI, Kah Loong HOH, Kwang Hyun KIM, Atsushi SAKUDA, Masahiro TATSUMISAGO, Steve W. MARTIN, Akitoshi HAYASHI

    Journal of the Ceramic Society of Japan   129 ( 6 )   323 - 328   2021.06( ISSN:1882-0743

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    Solid electrolytes are important materials for enhancing the performance of all-solid-state sodium rechargeable batteries. Na10+xSn1+xP2-xS12 (0 ≤ x ≤ 1.2) samples were prepared using a mechanochemical process, followed by heat treatment and their structures and ionic conductivities were investigated. Glassy samples were obtained via the mechanochemical process; the samples with the Na11Sn2PS12 type crystal structure were obtained for all the prepared compositions through the heat treatment of the glasses. The Na11Sn2PS12 (x = 1) sample obtained by heat treatment at 300°C exhibited an ionic conductivity of 2.6

    DOI: 10.2109/jcersj2.21010

  • Mechanochemical Synthesis and Characterization of Na3-xP1-xWxS4 Solid Electrolytes Reviewed

    F. Tsuji, A. Nasu, A. Sakuda, M. Tatsumisago and A. Hayashi

    Journal of Power Sourses 雑誌   506 ( 230100 )   1 - 8   2021.06

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  • Investigation of the Suppression of Dendritic Lithium Growth with a Lithium-Iodide-Containing Solid Electrolyte Reviewed

    M. Takahashi, T. Watanabe, K. Yamamoto, K. Ohara, A. Sakuda, T. Kimura, S.H. Yang, K. Nakanishi, T. Uchiyama, M, Kimura, A. Hayashi, M. Tatsumisago and Y. Uchimoto

    Chem. Mater. 雑誌   33   4907 - 4914   2021.06

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  • In Situ Observation of the Deterioration Process of Sulfide-based Solid Electrolytes Using Airtight and Air-Flow TEM Systems Reviewed

    H. Tsukasaki, K. Igarashi, A. Wakui, T. Yaguchi, H. Nakajima, T. Kimura, A. Sakuda, M. Tatsumisago, A. Hayashi and S. Mori

    Microscopy 雑誌   2021   1 - 7   2021.06

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  • Importance of Li-Metal/Sulfide Electrolyte Interphase Ionic Conductivity in Suppressing Short-Circuiting of All-Solid-State Li-Metal Batteries Reviewed

    M. Suyama, S. Yubuchi, M. Deguchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    Journal of The Electrochemical Society 雑誌   168 ( 060542 )   1 - 6   2021.06

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  • Electrode Performance of Amorphous MoS3 in All-Solid-State Sodium Secondary Batteries Reviewed

    G. Shirota, A. Nasu, M. Deguchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    Journal of Power Sources Advances 雑誌   10 ( 100061 )   1 - 7   2021.06

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  • Solid Electrolytes Na10+xSn1+xP2-xS12 Prepared via a Mechanochemical Process Reviewed

    F. Tsuji, K.L. Hoh, K.H. Kim, A. Sakuda, M. Tatsumisago, S.W. Martin and A. Hayashi

    Journal of the Ceramic Society of Japan 雑誌   129 ( 6 )   323 - 328   2021.06

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  • Microstructure and Charge-Discharge Mechanism of a Li3CuS2 Positive Electrode Material for All-Solid-State Lithium-Ion Batteries Reviewed

    T. Ayama, H. Tsukasaki, Y. Kawasaki, H. Nakajima, M. Tatsumisago, A. Sakuda, A. Hayashi and S. Mori

    ACS Appl. Energy Mater.   4   6290 - 6295   2021.06

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  • Importance of li-metal/sulfide electrolyte interphase ionic conductivity in suppressing short-circuiting of all-solid-state li-metal batteries

    Motoshi Suyama, So Yubuchi, Minako Deguchi, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of the Electrochemical Society   168 ( 6 )   2021.06( ISSN:0013-4651

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    The electronic and ionic conductivities of the interphase that forms between Li metal and solid electrolytes (SEs) are key parameters in determining battery cell performance. In this study, we evaluated the effect of the interphase on Li dissolution/deposition behaviors. The reduction of Li2S-P2S5 glasses to Li2S and Li3P by Li metal occurred at the Li/SE interface. The Li dissolution/deposition performance at 100 °C was improved by increasing the Li3P content in the interphase, and the cell with a Li4P2S6 glass electrolyte functioned without short-circuiting at a current density of 1.3 mA cm-2. The ionic conductivity of the Li/SE interphase was evaluated by preparing Li-SE compounds using mechanochemical processing. The milled sample prepared from Li metal and Li4P2S6 glass showed a one order of magnitude higher conductivity of 10-4 S cm-1 at 100 °C than that of the Li-Li3PS4 milled sample, indicating that the ionic conductivity of the interphase formed at the Li/SE interface is an important factor for improving the short-circuiting tolerance of all-solid-state Li-metal batteries.

    DOI: 10.1149/1945-7111/ac0995

  • Development, structure, and mechanical properties of sulfide solid electrolytes

    Koji Ohara, Atsushi Sakuda, Akitoshi Hayashi

    Encyclopedia of Materials: Technical Ceramics and Glasses   3-3   38 - 48   2021.05( ISBN:9780128222331

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    DOI: 10.1016/B978-0-12-803581-8.12133-2

  • Preparation and characterization of Li<sub>4</sub>GeO<sub>4</sub>-based oxide glass-ceramic electrolytes via the mechanochemical method

    米田陽平, 作田敦, 辰巳砂昌弘, 林晃敏

    電気化学会大会講演要旨集(CD-ROM)   88th   2021.05( ISSN:0167-2738

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    A new lithium-ion conducting oxide, hexagonal Li4GeO4, with a space group of P63/mmc, was prepared by mechanochemical treatment and subsequent heat treatment at 250 °C. The crystal structure was found in sulfide Li4SnS4, and this is the first study to report an oxide system. In addition, (100-x)Li4GeO4·xLi2MO4 (M = S or W; x = 10, 20, 30, and 40 mol%) glass-ceramic electrolytes with the hexagonal phase were prepared by crystallization of their mother glasses. The formability of the electrolytes improved as the quantity of Li2SO4 increased, and the 90Li4GeO4·10Li2SO4 glass-ceramic electrolyte showed the highest ionic conductivity of 2.9 × 10−6 S cm−1 at 25 °C. Compared with the experimental results, the bond valence sum (BVS) analysis results indicated that ionic conduction paths are easily connected along the c-axis in the hexagonal phase, suggesting that the relatively small lattices in the a- and b-axes are more advantageous for three-dimensional ionic conduction.

    DOI: 10.1016/j.ssi.2021.115605

    J-GLOBAL

  • High Ionic Conductivity of Liquid-Phase-Synthesized Li3PS4 Solid Electrolyte, Comparable to That Obtained via Ball Milling Reviewed

    K. Yamamoto, S.H. Yang, M. Takahashi , K. Ohara, T. Uchiyama, T. Watanabe, A. Sakuda, A. Hayashi, M. Tatsumisago, H. Muto, A. Matsuda and Y. Uchimoto

    ACS Appl. Energy Mater. 雑誌   4   2275 - 2281   2021.04

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  • Synthesis and Electrochemical Properties of Li3CuS2 as a Positive Electrode Material for All-Solid-State Batteries Reviewed

    Y. Kawasaki, H. Tsukasaki, T. Ayama, S. Mori, M. Deguchi, M. Tatsumisago, A. Sakuda and A. Hayashi

    ACS Appl. Energy Mater. 雑誌   4   20 - 24   2021.04

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Kind of work:Joint Work  

    DOI: https://doi.org/10.1021/acsaem.1c01074

  • Preparation and Characterization of Hexagonal Li4GeO4-based Glass-Ceramic Electrolytes Reviewed

    Y. Yoneda, M. Shigeno, T. Kimura, K. Nagao, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi

    Solid State Ionics 雑誌   363 ( 115605 )   1 - 7   2021.04

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  • Improvement of Electrochemical Property of VS4 Electrode Material by Amorphization via Mechanical Milling Process Reviewed

    K. Koganei, A. Sakuda, T. Takeuchi, H. Kiuchi and H. Sakaebe

    Electrochemistry 雑誌   89 ( 3 )   239 - 243   2021.04

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  • Visualizing Local Electrical Properties of Composite Electrodes in Sulfide All-Solid-State Batteries by Scanning Probe Microscopy Reviewed

    M. Otoyama, T. Yamaoka, H. Ito, Y. Inagi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Phys. Chem. C 雑誌   125   2841 - 2849   2021.04

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  • High Ionic Conductivity of Liquid-Phase-Synthesized Li<inf>3</inf>PS<inf>4</inf>Solid Electrolyte, Comparable to That Obtained via Ball Milling

    Kentaro Yamamoto, Seunghoon Yang, Masakuni Takahashi, Koji Ohara, Tomoki Uchiyama, Toshiki Watanabe, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago, Hiroyuki Muto, Atsunori Matsuda, Yoshiharu Uchimoto

    ACS Applied Energy Materials   4 ( 3 )   2275 - 2281   2021.03( ISSN:2574-0962

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    Recently, several sulfide solid electrolytes have been synthesized by liquid-phase synthesis for the commercialization of all-solid-state batteries. Unfortunately, the ionic conductivity for most of these electrolytes is unsatisfactory compared to that of solid electrolytes synthesized by conventional ball milling. This problem is attributed to different mechanisms between the liquid phase and the solid phase in reaction and formation. However, to the best of our knowledge, the effect of the solvent on the ionic conductivity of solid electrolytes has not been extensively investigated, although the identification of these properties is a key point in understanding the liquid-phase synthesis. Herein, the correlation between ionic conductivity and crystallinity originating from the solvents used has been investigated. As a result, the ionic conductivity of the electrolyte was found to be strongly dependent on polarity (δP) with low crystallinity. The highest ionic conductivity (5.09 × 10-4 S cm-1 at 25 °C) was obtained using butyl acetate, which exhibited the lowest δP. Moreover, the highest ionic conductivity of Li3PS4 produced by liquid-phase synthesis using butyl acetate was very comparable to that obtained by ball milling (5.14 × 10-4 S cm-1).

    DOI: 10.1021/acsaem.0c02771

  • Improvement of lithium ionic conductivity of Li<inf>3</inf>PS<inf>4</inf> through suppression of crystallization using low-boiling-point solvent in liquid-phase synthesis

    Masakuni Takahashi, Seunghoon Yang, Kentaro Yamamoto, Koji Ohara, Nguyen Huu Huy Phuc, Toshiki Watanabe, Tomoki Uchiyama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago, Hiroyuki Muto, Atsunori Matsuda, Yoshiharu Uchimoto

    Solid State Ionics   361   115568 - 115568   2021.03( ISSN:0167-2738

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    Publishing type:Research paper (scientific journal)  

    Liquid-phase synthesis for solid electrolytes has received considerable attention owing to its shape control, with the potential to produce particles easily on a large scale, and its low cost and energy consumption. However, solid electrolytes prepared through liquid-phase synthesis have been shown to have lower ionic conductivity than solid electrolytes prepared through the mechanical milling method. Recently, following various efforts, our group found that the crystallinity and remaining intermediate are the reasons for the low ionic conductivity of these materials. By using tetrahydrofuran (THF), we successfully improved the ionic conductivity of Li3PS4 to 1.85 × 10−4 S cm−1 at 25 °C, higher than that afforded by ethyl propionate, which was reported to produce the highest ionic conductivity among the solvents used for liquid-phase synthesis. High-energy X-ray diffraction (XRD) measurements coupled with pair distribution function (PDF) analysis were employed to analyze the synthesized materials in order to determine why the ionic conductivity was higher than that of a sample prepared using ethyl propionate. The PDF analysis revealed that the crystallization of Li3PS4 can be suppressed using THF, which has a lower boiling point than ethyl propionate. Moreover, it was revealed that the solvent could not be removed completely when the material has an amorphous structure, and thus, the ionic conductivity was lower than that of a material prepared using the solid-phase synthesis method.

    DOI: 10.1016/j.ssi.2021.115568

  • Visualizing local electrical properties of composite electrodes in sulfide all-solid-state batteries by scanning probe microscopy

    Atsushi Sakuda, Misae Otoyama, Takehiro Yamaoka, Hiroyuki Ito, Yuki Inagi, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of Physical Chemistry C   125 ( 5 )   2841 - 2849   2021.02( ISSN:1932-7447

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    Studies on local conduction paths in composite electrodes are essential to the realization of high-performance sulfide all-solid-state lithium batteries. Here, we directly evaluate the electrical properties of individual LiNi1/3Mn1/3Co1/3O2 (NMC) electrode active material particles in composite positive electrodes by scanning probe microscopy (SPM) techniques. Kelvin probe force microscopy (KPFM) and scanning spreading resistance microscopy (SSRM) are combined. The results indicate that all NMC particles exhibit a charged state with increasing potential, but low electronic conduction paths exist at point of contacts of some NMC particles. Furthermore, the I-V characteristics measured by conductive atomic force microscopy (C-AFM) suggest that these specific NMC particles show low charge-discharge reactivity. The results of the SPM techniques indicate that poor conduction locally limits the charge-discharge reactivity of electrode active materials, leading to the degradation of battery performance. Such an SPM combination accelerates the morphological optimization of composite electrodes by facilitating the investigation of the intrinsic electrical properties of the electrodes.

    DOI: 10.1021/acs.jpcc.0c10148

  • Visualization and Control of Chemically Induced Crack Formation in All-Solid-State Lithium-Metal Batteries with Sulfide Electrolyte

    Misae Otoyama, Motoshi Suyama, Chie Hotehama, Hiroe Kowada, Yoshihiro Takeda, Koichiro Ito, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    ACS Applied Materials and Interfaces   13 ( 4 )   5000 - 5007   2021.02( ISSN:1944-8244

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    The application of lithium metal as a negative electrode in all-solid-state batteries shows promise for optimizing battery safety and energy density. However, further development relies on a detailed understanding of the chemo-mechanical issues at the interface between the lithium metal and solid electrolyte (SE). In this study, crack formation inside the sulfide SE (Li3PS4: LPS) layers during battery operation was visualized using in situ X-ray computed tomography (X-ray CT). Moreover, the degradation mechanism that causes short-circuiting was proposed based on a combination of the X-ray CT results and scanning electron microscopy images after short-circuiting. The primary cause of short-circuiting was a chemical reaction in which LPS was reduced at the lithium interface. The LPS expanded during decomposition, thereby forming small cracks. Lithium penetrated the small cracks to form new interfaces with fresh LPS on the interior of the LPS layers. This combination of reduction-expansion-cracking of LPS was repeated at these new interfaces. Lithium clusters eventually formed, thereby generating large cracks due to stress concentration. Lithium penetrated these large cracks easily, finally causing short-circuiting. Therefore, preventing the reduction reaction at the interface between the SE and lithium metal is effective in suppressing degradation. In fact, LPS-LiI electrolytes, which are highly stable to reduction, were demonstrated to prevent the repeated degradation mechanism. These findings will promote all-solid-state lithium-metal battery development by providing valuable insight into the design of the interface between SEs and lithium, where the selection of a suitable SE is vital.

    DOI: 10.1021/acsami.0c18314

    PubMed

  • Preparation and Characterization of Sodium-Ion Conductive Na3BS3 Glass and Glass-Ceramic Electrolytes Reviewed

    F. Tsuji, A. Nasu, C. Hotehama, A. Sakuda, M. Tatsumisago and A. Hayashi

    Mater. Adv. 雑誌   2   1676 - 1682   2021.02

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  • Comparison of Sulfur Cathode Reactions between a Concentrated Liquid Electrolyte System and a Solid-State Electrolyte System by Soft X-Ray Absorption Spectroscopy

    Yao Xiao, Kentaro Yamamoto, Yukiko Matsui, Toshiki Watanabe, Atsushi Sakuda, Koji Nakanishi, Tomoki Uchiyama, Akitoshi Hayashi, Shoso Shingubara, Masahiro Tatsumisago, Masashi Ishikawa, Masayoshi Watanabe, Yoshiharu Uchimoto

    ACS Applied Energy Materials   4 ( 1 )   186 - 193   2021.01( ISSN:2574-0962

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    Sulfur is one of the promising next-generation cathode materials because of its low cost and high theoretical gravimetric capacity. However, the reaction mechanism of the sulfur cathode is largely influenced by the electrolyte and the intermediate sulfur species during the first discharge process has not been quantitatively explored in different electrolytes. In this study, we elucidated the reaction mechanism of sulfide cathodes by using three different electrolyte systems, viz., a conventional liquid electrolyte [LiPF6/ethylene carbonate (EC)/ethylene-methyl carbonate (EMC)], a concentrated liquid electrolyte [lithium bis(trifluorosulfonyl)amide (LiTFSA)/tetraglyme (G4):1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (HFE)], and a solid-state electrolyte (Li3PS4). Soft X-ray absorption spectroscopy was used to examine the reaction mechanism of the sulfur cathode in the liquid and solid-state electrolytes during the first discharge process. In the conventional electrolyte, the sulfur cathode was reduced to long-chain polysulfide (S62-) during the first discharge process, and the polysulfide subsequently dissolved into the electrolyte. In the concentrated electrolyte, the sulfur cathode was reduced to midchain polysulfide (S42-) at the initial stage of the first discharge process and then reduced to short-chain polysulfide (S22-) and Li2S, followed by the formation of long-chain polysulfide (S62-). In the solid-state electrolyte, the sulfur cathode was reduced to long-chain polysulfide (S62-) at the initial stage of the first discharge process and was gradually reduced to mid-chain polysulfide (S42-), short-chain polysulfide (S22-), and Li2S. The differences in these reaction pathways govern electrochemical properties such as the difference in discharge voltage.

    DOI: 10.1021/acsaem.0c02063

  • Synthesis and Electrochemical Properties of Li<inf>3</inf>CuS<inf>2</inf>as a Positive Electrode Material for All-Solid-State Batteries

    Yusuke Kawasaki, Hirofumi Tsukasaki, Tomoji Ayama, Shigeo Mori, Minako Deguchi, Masahiro Tatsumisago, Atsushi Sakuda, Akitoshi Hayashi

    ACS Applied Energy Materials   4 ( 1 )   20 - 24   2021.01

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    All-solid-state batteries using flame-retardant inorganic solid electrolytes boast of advantages such as safety and wide usable temperature ranges. Although Li2S with an antifluorite-type structure has a high theoretical capacity, it is challenging to use in all-solid-state batteries because of the insulating nature. Here, we report an antifluorite-type Li3CuS2 as a sulfide positive electrode active material with high electronic conductivity. All-solid-state batteries using Li3CuS2 were successfully operated without the addition of conductive additives to the positive electrode. The Li3CuS2 exhibited an initial charge-discharge capacity of 380 mAh g-1 with an average discharge voltage of 2.1 V vs Li+/Li.

    DOI: 10.1021/acsaem.0c02657

  • Visualization and Control of Chemically Induced Crack Formation in All-Solid-State Lithium-Metal Batteries with Sulfide Electrolyte Reviewed

    M. Otoyama, M. Suyama, C. Hotehama, H. Kowada, Y. Takeda, K. Ito, A. Sakuda, M. Tatsumisago and A. Hayashi

    ACS Appl. Mater. Interfaces 雑誌   13   5000 - 5007   2021.01

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    Kind of work:Joint Work  

  • Comparison of Sulfur Cathode Reactions between a Concentrated Liquid Electrolyte System and a Solid-State Electrolyte System by Soft X-Ray Absorption Spectroscopy Reviewed

    Y. Xiao, K. Yamamoto, Y. Matsui, T. Watanabe, A. Sakuda, K. Nakanishi, T. Uchiyama, A. Hayashi, S. Shingubara, M. Tatsumisago, M. Ishikawa, M. Watanabe and Y. Uchimoto

    ACS Appl. Energy Mater. 雑誌   4   186 - 193   2021.01

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  • Improvement of Lithium Ionic Conductivity of Li3PS4 through Suppression of Crystallization Using Low-Boiling-Point Solvent in Liquid-phase Synthesis Reviewed

    M. Takahashi, S. H. Yang, K. Yamamoto, K. Ohara, N. H. H. Phuc, T. Watanabe, T. Uchiyama, A. Sakuda, A. Hayashi, M. Tatsumisago, H. Muto, A. Matsuda and Y. Uchimoto

    Solid State Ionics 雑誌   361 ( 115568 )   1 - 5   2021.01

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  • Improvement of electrochemical property of VS<inf>4</inf>electrode material by amorphization via mechanical milling process

    Kazuto KOGANEI, Atsushi SAKUDA, Tomonari TAKEUCHI, Hisao KIUCHI, Hikari SAKAEBE

    Electrochemistry   89 ( 3 )   239 - 243   2021( ISSN:1344-3542

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    Amorphous VS4(a-VS4) electrode material was synthesized by mechanical milling of crystalline VS4(c-VS4). The columbic efficiency of the a- VS4cell was significantly improved (ca. 86 %) at the first cycle as compared with the c-VS4cell (ca. 77 %), resulting in the improved capacity retention for prolonged cycling. Pair distribution function (PDF) analysis obtained from X-ray total scattering data, revealed that the radial atomic distribution of a-VS4at initial stage was similar to that of the low-crystalline VS4appeared after the first cycle of c-VS4. This is suggestive that the amorphization via mechanical milling process gave rise to the preparation of "first cycled VS4" which would contribute to the improved columbic efficiency at the first cycle and the resulting improved capacity retention for prolonged cycling. The structure of a-VS4could be visualized by first-principles molecular dynamic calculation of "first-cycled VS4".

    DOI: 10.5796/electrochemistry.21-00015

  • Amorphous Li<inf>2</inf>O-lii solid electrolytes compatible to li metal

    Yushi Fujita, Yusuke Kawasaki, Takeaki Inaoka, Takuya Kimura, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Electrochemistry   89 ( 4 )   334 - 336   2021( ISSN:1344-3542

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    Development of oxide solid electrolytes for all-solid-state batteries is attracting increasing attention. In this study, amorphous Li2O-LiI materials are prepared via a mechanochemical process to achieve high lithium ionic conductivity and good compatibility to lithium metal. Amorphous 66.7Li2O·33.3LiI (mol%) electrolyte shows a high ionic conductivity of 3.1 × 10−5 S cm−1 at 25 °C with a relative density of 96 %. An all-solid-state Li symmetric cell (Li/66.7Li2O·33.3LiI/Li) operates without an increase in overvoltage. A simple combination of lithium oxide and lithium iodide exhibits high ionic conductivity, ductility, and stability to lithium metal.

    DOI: 10.5796/electrochemistry.21-00049

  • Preparation and Characterization of Cation-Substituted Na<inf>3</inf>SbS<inf>4</inf> Solid Electrolytes

    Fumika Tsuji, Naoki Masuzawa, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    ACS Applied Energy Materials   3 ( 12 )   11706 - 11712   2020.12

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    To realize all-solid-state sodium-ion batteries, the ionic conductivities and stabilities of solid electrolytes must be improved. The sulfide Na3SbS4 electrolyte is known to show a high sodium-ion conductivity of over 10-3 S cm-1 at room temperature. In this study, cation-substituted Na3SbS4 solid electrolytes with excess Na or Na vacancies were prepared, and the effects of substitution on the material conductivity were examined. The ionic conductivities of the Na3+xSb1-xMxS4 (M = Si, Ge, Sn) electrolytes, which were doped with excess Na, were lower than that of the Na3SbS4 electrolyte; in contrast, the conductivities of the Na3-xSb1-xMoxS4 electrolytes, which were doped with Na vacancies, were higher. The Na2.88Sb0.88Mo0.12S4 electrolyte showed the highest room-temperature ionic conductivity of 3.9 × 10-3 S cm-1 and the lowest activation energy for conduction of 21 kJ mol-1. To improve the ionic conductivity of the Na3SbS4 electrolyte, introducing Na vacancies instead of excess Na was found to be effective.

    DOI: 10.1021/acsaem.0c01823

  • Exothermal behavior and microstructure of a LiNi<inf>1/3</inf>Mn<inf>1/3</inf>Co<inf>1/3</inf>O<inf>2</inf> electrode layer using a Li<inf>4</inf>SnS<inf>4</inf> solid electrolyte

    Hirofumi Tsukasaki, Misae Otoyama, Takuya Kimura, Shigeo Mori, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of Power Sources   479   2020.12( ISSN:0378-7753

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    © 2020 Elsevier B.V. A positive electrode containing Li3PS4 (LPS) glasses and LiNi1/3Mn1/3Co1/3O2 (NMC) is a promising candidate for sulfide-based all-solid-state lithium batteries owing to its excellent charge–discharge cycle characteristics. However, sulfide-based solid electrolytes exhibit low chemical stability in air. This disadvantage affects process cost and thermal stability of all-solid-state cells. To resolve these issues, in this study, we focus on solid electrolytes, Li4SnS4 (LSS), that do not generate H2S gas in air. The thermal behavior and microstructure of LSS–NMC positive electrode composites before and after the initial charge–discharge cycle are investigated. The initially charged LSS–NMC composites exhibit several exothermal reactions above 250 °C. However, pristine and initially discharged samples do not show any considerable exothermal reactions. For LPS–NMC composites, by contrast, exothermal reactions are detected regardless of the charging and discharging state. To clarify the exothermic factors of initially charged LSS–NMC composites, we performed ex situ transmission electron microscopy observation and X-ray diffraction measurements. It is determined that SnS2, transition metal sulfides, and metal oxides are formed above 300 °C, which is attributable to LSS and NMC decomposition reactions. On the basis of the relation between thermal behavior and corresponding structural changes, exothermic factors and thermal stability of LSS–NMC composites are discussed in comparison with LPS–NMC composites.

    DOI: 10.1016/j.jpowsour.2020.228827

  • Preparation and Characterization of Cation-Substituted Na3SbS4 Solid Electrolytes Reviewed

    F. Tsuji, N. Masuzawa, A. Sakuda, M. Tatsumisago and A. Hayashi

    ACS Appl. Energy Mater. 雑誌   3   11706 - 11712   2020.12

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  • Effect of volume changes of active materials under different compressive pressures on the performance and microstructure of sulfide-based all-solid-state batteries

    山本真理, 寺内義洋, 作田敦, 加藤敦隆, 高橋雅也

    電池討論会PDF要旨集(CD-ROM)   61st   228595 - 228595   2020.10( ISSN:0378-7753

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    Compressive pressure applied during the operation of all-solid-state batteries that employ a sulfide solid electrolyte (SE) assists particle contact, thereby maintaining the ionic and electronic conduction network. The relationship between compressive pressure and volume variation in active materials is critical for designing practical full-cells with enhanced cell-based energy densities. However, studies into these aspects are rare. Here, we systematically investigate the effects of volume change of active materials [silicon, graphite, and LiNi1/3Mn1/3Co1/3O2 (NMC)] at different pressures (75 and 50 MPa) on electrochemical performance, cell internal resistance, and microstructure of full-cells with a thin SE layer (approximately 75-μm-thick). Pressurization at 75 MPa and use of graphite with lower expansion ratios improves capacity and capacity retentions. Increasing variation in the negative electrode volume increases charge-transfer resistance and crack formation in the NMC-composite layer. This indicates that the buffering effect via the elastic deformation of the thin SE layer is insufficient. Pressure facilitates plastic deformation of LixSi and SE, resulting in their improved contact, while perpendicular cracks appear throughout the Si-composite layer, effectively alleviating stress derived from variations in the volume of Si. This study provides important mechanistic insights into the design of advanced active materials and batteries required for industrial applications.

    DOI: 10.1016/j.jpowsour.2020.228595

    J-GLOBAL

  • First-Principles Calculation Study of Na<sup>+</sup>Superionic Conduction Mechanism in W- And Mo-Doped Na<inf>3</inf>SbS<inf>4</inf>Solid Electrolytes

    Randy Jalem, Akitoshi Hayashi, Fumika Tsuji, Atsushi Sakuda, Yoshitaka Tateyama

    Chemistry of Materials   32 ( 19 )   8373 - 8381   2020.10( ISSN:0897-4756

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    Publishing type:Research paper (scientific journal)  

    © 2020 American Chemical Society. The guiding principle for the design of inorganic compounds with high ionic conductivity has been extensively sought to realize next-generation all-solid-state batteries (ASSBs). Recently, a sulfide-type Na+ ion conductor, cubic Na3SbS4 with W doping (Na2.88Sb0.88W0.12S4), was reported with unprecedentedly high ionic conductivity of 3.2 × 10-2 S cm-1, making it now a champion solid electrolyte for Na-ASSB (A. Hayashi et al., Nat. Commun. 2019, 10, 5266). Herein, density functional theory molecular dynamics (DFT-MD) calculations were performed for pristine, W-doped, and Mo-doped Na3SbS4 to examine the ionic conduction mechanism (Boltzmann factor vs prefactor) and the aliovalent cation dopant effects in Na3SbS4. We showed that Na vacancies induced by cation doping play crucial roles in superionic conductivity, while the diffusion process is rather characterized by the concerted motion of Na+ ions. A comparison between the two dopants, Mo6+ and W6+, revealed that the conductivity enhancement can be primarily explained by a decrease of Na+ ion activation energy, which is found to be strongly correlated to the enlargement of Na Wyckoff site cages brought upon by the smaller WS4/MoS4 tetrahedral volume relative to the host SbS4 volume. This descriptor of the pathway free volume can suggest a general guiding principle for superionic conduction that can be applied to other cations, in addition to explaining the superior performance of W-doped Na3SbS4.

    DOI: 10.1021/acs.chemmater.0c02318

  • Synthesis of Sulfide Solid Electrolytes through the Liquid Phase: Optimization of the Preparation Conditions

    Kentaro Yamamoto, Masakuni Takahashi, Koji Ohara, Nguyen Huu Huy Phuc, Seunghoon Yang, Toshiki Watanabe, Tomoki Uchiyama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago, Hiroyuki Muto, Atsunori Matsuda, Yoshiharu Uchimoto

    ACS Omega   5 ( 40 )   26287 - 26294   2020.10

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    All-solid-state lithium batteries using inorganic sulfide solid electrolytes have good safety properties and high rate capabilities as expected for a next-generation battery. Presently, conventional preparation methods such as mechanical milling and/or solid-phase synthesis need a long time to provide a small amount of the product, and they have difficult in supplying a sufficient amount to meet the demand. Hence, liquid-phase synthesis methods have been developed for large-scale synthesis. However, the ionic conductivity of sulfide solid electrolytes prepared via liquid-phase synthesis is typically lower than that prepared via solid-phase synthesis. In this study, we have controlled three factors: (1) shaking time, (2) annealing temperature, and (3) annealing time. The factors influencing lithium ionic conductivity of Li3PS4 prepared via liquid-phase synthesis were quantitatively evaluated using high-energy X-ray diffraction (XRD) measurement coupled with pair distribution function (PDF) analysis. It was revealed from PDF analysis that the amount of Li2S that cannot be detected by Raman spectroscopy or XRD decreased the ionic conductivity. Furthermore, it was revealed that the ionic conductivity of Li3PS4 is dominated by other parameters, such as remaining solvent in the sample and high crystallinity of the sample.

    DOI: 10.1021/acsomega.0c04307

  • Preparation of Sodium-Ion-Conductive Na3-xSbS4-xClx Solid Electrolytes Reviewed

    F. Tsuji, S. Yubuchi, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Ceram. Soc. Jpn. 雑誌   128 ( 9 )   641 - 647   2020.09

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  • Synthesis of Sulfide Solid Electrolytes through the Liquid Phase: Optimization of the Preparation Conditions Reviewed

    K. Yamamoto, M. Takahashi, K. Ohara, N. H. H. Phuc, S. H. Yang, T. Watanabe, T. Uchiyama, A. Sakuda, A. Hayashi, M. Tatsumisago, H. Muto, A. Matsuda and Y. Uchimoto

    ACS Omega 雑誌   5   26287 - 26294   2020.09

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  • First-Principles Calculation Study of Na+ Superionic Conduction Mechanism in W- and Mo-Doped Na3SbS4 Solid Electrolytes Reviewed

    R. Jalem, A. Hayashi, F. Tsuji, A. Sakuda and Y. Tateyama

    Chem. Mater. 雑誌   32   8373 - 8381   2020.09

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  • Preparation and Characterization of Composite Quasi-Solid Electrolytes Composed of 75Li2S・25P2S5 Glass and Phosphate Esters Reviewed

    K. Shimamoto, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Power Sources 雑誌   479 ( 228826 )   1 - 6   2020.09

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  • Characterization of Quasi-Solid Electrolytes Based on Li3PS4 Glass with Organic Carbonate Additives Reviewed

    K. Shimamoto, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Ceram. Soc. Jpn. 雑誌   128 ( 9 )   653 - 655   2020.09

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  • Preparation of sodium-ion-conductive Na<inf>3-x</inf>SbS<inf>4-x</inf>Cl<inf>x</inf>solid electrolytes

    Fumika Tsuji, So Yubuchi, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of the Ceramic Society of Japan   128 ( 9 )   641 - 647   2020.09( ISSN:1882-0743

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    © 2020 Ceramic Society of Japan. All rights reserved. Solid electrolytes have become important materials for improving the performance of next-generation all-solidstate sodium rechargeable batteries. Therefore, sodium vacancy doping for Na3SbS4electrolytes was performed by partially substituting Cl for S. Na3-xSbS4-xClxelectrolytes were prepared using a mechanochemical process and consecutive heat treatment. The structures, ionic conductivities, and air safety of the prepared Na3-x- SbS4-xCxl electrolytes were evaluated via X-ray diffraction and impedance, air stability, and electrochemical tests. The Na2.9375SbS3.9375Cl0.0625electrolyte showed a higher room-temperature ionic conductivity of 2.9 × 10-3Scm-1than that of the Na3SbS4electrolyte. An all-solid-state Na15Sn4/Na2.9375SbS3.9375Cl0.0625/TiS2cell showed a reversible capacity of approximately 100mAh g-1at room temperature. Thus, the Na2.9375SbS3.9375Cl0.0625solid electrolyte has the potential for application as a solid electrolyte in all-solid-state batteries.

    DOI: 10.2109/jcersj2.20089

  • Characterization of quasi-solid electrolytes based on Li<inf>3</inf>PS<inf>4</inf>glass with organic carbonate additives

    Kei Shimamoto, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of the Ceramic Society of Japan   128 ( 9 )   653 - 655   2020.09( ISSN:1882-0743

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    ©2020 The Ceramic Society of Japan. All rights reserved. Composite quasi-solid electrolytes comprising Li3PS4 (LPS) glass and various organic carbonates were prepared, and the effects of these carbonates on the glass were investigated. Compared to LPS glass, the conductivity decreased for composites with highly dielectric cyclic carbonates and increased slightly for composites with a poorly dielectric linear carbonate. Scanning electron microscopy observations indicated that the addition of a poorly dielectric linear carbonate slightly improved the formability of LPS glass.

    DOI: 10.2109/jcersj2.20114

  • Quasi-Solid Electrolytes Comprising Sulfide Electrolyte and Carboxylate Esters: Investigation of the Influence of the Carboxylate Ester Structure Reviewed

    K. Shimamoto, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Electrochem. Soc. 雑誌   167 ( 120521 )   1 - 6   2020.08

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  • Exothermal Behavior and Microstructure of a LiNi1/3Mn1/3Co1/3O2 Electrode Layer Using a Li4SnS4 Solid Electrolyte Reviewed

    H. Tsukasaki, M. Otoyama, T. Kimura, S. Mori, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Power Sources 雑誌   479 ( 228827 )   1 - 7   2020.08

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  • Sulfide Electrolyte Suppressing Side Reactions in Composite Positive Electrodes for All-Solid-State Lithium Batteries

    Misae Otoyama, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    ACS Applied Materials and Interfaces   12 ( 26 )   29228 - 29234   2020.07( ISSN:1944-8244

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    © 2020 American Chemical Society. Long-lasting all-solid-state batteries can be achieved by preventing side reactions in the composite electrodes comprising electrode active materials and solid electrolytes. Typically, the battery performance can be enhanced through the use of robust solid electrolytes that are resistant to oxidation and decomposition. In this study, the thermal stability of sulfide solid electrolytes Li3PS4 and Li4SnS4 toward oxide positive electrode active materials was estimated by investigating the occurrence of side reactions at the electrolyte-electrode interfaces when the composite electrodes are heated in an accelerated aging test: Li4SnS4 showed higher thermal stability because of the suppression of the substitution reaction between S and O. Moreover, thermally stable sulfide solid electrolytes are amenable to an improved cell construction process. The sintering (pelletizing and subsequent heating) of the composite electrodes with Li4SnS4 as the solid electrolyte allowed the manufacture of dense electrodes that exhibited increased ionic conductivity, thereby enhancing the battery performance.

    DOI: 10.1021/acsami.0c05050

    PubMed

  • Effects of Volume Variations under Different Compressive Pressures on the Performance and Microstructure of All-Solid-State Batteries Reviewed

    M. Yamamoto, Y. Terauchi, A. Sakuda, A. Kato and M. Takahashi

    J. Power Sources 雑誌   473 ( 228595 )   1 - 10   2020.07

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  • All-solid-state sodium-sulfur battery showing full capacity with activated carbon MSP20-sulfur-Na<inf>3</inf>SbS<inf>4</inf> composite

    Taka Ando, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Electrochemistry Communications   116   2020.07( ISSN:1388-2481

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    © 2020 The Authors The need for an effective design of composite electrodes in all-solid-state Na-S batteries is warranted because of their slow charge–discharge reactions. By employing a composite of activated carbon MSP20, sulfur, and Na3SbS4 as the positive electrode material, we developed an effective all-solid-state Na-S battery that demonstrated the advantages of exhibiting a high capacity and good cyclability. Further, we discovered that filling the carbon micropores with sulfur and combining with highly conductive Na3SbS4, results in a reversible two-electron reaction between S and Na2S. This all-solid-state Na-S battery, operating at room temperature, demonstrates a high capacity of 1560 mAh per gram of sulfur (ca. 330 mAh per gram of positive electrode) and a capacity retention of 93% after 50 cycles. Decreasing the size of the S-MSP20 particles coated with Na3SbS4 in a liquid phase process was observed to reduce the volume change of the particles during charge and discharge cycles, which resulted in an excellent electrochemical performance.

    DOI: 10.1016/j.elecom.2020.106741

  • Elucidation of Capacity Degradation for Graphite in Sulfide-Based All-Solid-State Lithium Batteries: A Void Formation Mechanism

    Kentaro Kuratani, Atsushi Sakuda, Tomonari Takeuchi, Hironori Kobayashi

    ACS Applied Energy Materials   3 ( 6 )   5472 - 5478   2020.06

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    Capacity degradation mechanism of graphite in sulfide-based all-solid-state lithium batteries has been investigated by adopting three different press conditions for cell assembling. Reversible redox reaction and stage transition of graphite were recognized from cyclic voltammetry and X-ray diffraction measurement. Initial charge and discharge capacity of graphite in the thus obtained three cells were ca. 310 and 270 mAh g-1, respectively, indicating that the press conditions did not affect the initial charge and discharge capacity of graphite. After 50 cycles, the cell pressed at the highest pressure maintained over 95% of the capacity of that obtained at the 10th cycle. The capacity of the cell pressed at the lowest pressure, on the other hand, faded near 90%. The increase of resistance assigned to bulk solid electrolyte during cycling was detected by the impedance spectroscopy, and the cell pressed at the lowest pressure exhibited the largest resistance increase among all of the cells. Cross-sectional scanning electron microscope observation revealed formation of the voids in the bulk solid electrolyte, especially in the cell pressed at the lowest pressure, after 50 cycles, which resulted in the increase of the resistance for bulk solid electrolyte and capacity degradation of graphite.

    DOI: 10.1021/acsaem.0c00460

  • Reaction uniformity visualized by Raman imaging in the composite electrode layers of all-solid-state lithium batteries

    Misae Otoyama, Yusuke Ito, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Physical Chemistry Chemical Physics   22 ( 23 )   13271 - 13276   2020.06( ISSN:1463-9076

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    © the Owner Societies. The reaction uniformity of LiCoO2 composite positive electrodes in all-solid-state cells was compared quantitatively by investigating the Raman band shifts corresponding to the state-of-charge (SOC) of LiCoO2. The quantitative SOC analysis was conducted using the Raman imaging data of composite electrodes with smaller or larger solid electrolytes. The electrodes exhibited different reaction uniformity although the cells showed similar initial charge capacities and average SOC. In the case of larger solid electrolytes, most LiCoO2 particles showed higher or lower SOC than the average SOC, and lower battery performance. The quantitative analysis of SOC in each LiCoO2 electrode demonstrated that a variable SOC outside the average SOC resulted in larger irreversible capacity and lower rate performance. The quantitative SOC analysis newly developed in the present study is a useful technique for designing composite electrodes showing higher battery performance.

    DOI: 10.1039/d0cp00508h

    PubMed

  • Sulfide Electrolyte Suppressing Side Reactions in Composite Positive Electrodes for All-Solid-State Lithium Batteries Reviewed

    M. Otoyama, A. Sakuda, M. Tatsumisago and A. Hayashi

    ACS Appl. Mater. Interfaces 雑誌   12   29228 - 29234   2020.06

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  • A Reversible Oxygen Redox Reaction in Bulk-type All-Solid-State Batteries Reviewed

    K. Nagao, Y. Nagata, A. Sakuda, A. Hayashi, M. Deguchi, C. Hotehama, H. Tsukasaki, S. Mori, Y. Orikasa, K. Yamamoto, Y. Uchimoto and M. Tatsumisago

    Sci. Adv. 雑誌   6 ( (eaax7236) )   1 - 11   2020.06

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  • A reversible oxygen redox reaction in bulk-type all-solid-state batteries Reviewed

    Kenji Nagao, Yuka Nagata, Atsushi Sakuda, Akitoshi Hayashi, Minako Deguchi, Chie Hotehama, Hirofumi Tsukasaki, Shigeo Mori, Yuki Orikasa, Kentaro Yamamoto, Yoshiharu Uchimoto, Masahiro Tatsumisago

    Science Advances   6 ( 25 )   eaax7236 - eaax7236   2020.06

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    An all-solid-state lithium battery using inorganic solid electrolytes requires safety assurance and improved energy density, both of which are issues in large-scale applications of lithium-ion batteries. Utilization of high-capacity lithium-excess electrode materials is effective for the further increase in energy density. However, they have never been applied to all-solid-state batteries. Operational difficulty of all-solid-state batteries using them generally lies in the construction of the electrode-electrolyte interface. By the amorphization of Li<sub>2</sub>RuO<sub>3</sub> as a lithium-excess model material with Li<sub>2</sub>SO<sub>4</sub>, here, we have first demonstrated a reversible oxygen redox reaction in all-solid-state batteries. Amorphous nature of the Li<sub>2</sub>RuO<sub>3</sub>-Li<sub>2</sub>SO<sub>4</sub> matrix enables inclusion of active material with high conductivity and ductility for achieving favorable interfaces with charge transfer capabilities, leading to the stable operation of all-solid-state batteries.

    DOI: 10.1126/sciadv.aax7236

    PubMed

  • Reaction Uniformity Visualized by Raman Imaging in the Composite Electrode Layers of All-Solid-State Lithium Batteries Reviewed

    M. Otoyama, Y. Ito, A. Sakuda, M. Tatsumisago and A. Hayashi

    Phys. Chem. Chem. Phys. 雑誌   22   13271 - 13276   2020.05

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  • Elucidation of Capacity Degradation for Graphite in Sulfide-Based All-Solid-State Lithium Batteries: A Void Formation Mechanism Reviewed

    K. Kuratani, A. Sakuda, T. Takeuchi and H. Kobayashi

    ACS Appl. Energy Mater. 雑誌   3   5472 - 5478   2020.05

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  • All-Solid-State Sodium-Sulfur Battery Showing Full Capacity with Activated Carbon MSP20-Sulfur-Na3SbS4 Composite Reviewed

    T. Ando, A. Sakuda, M. Tatsumisago and A. Hayashi

    Electrochemistry Communications 雑誌   116 ( 106741 )   1 - 5   2020.05

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  • High-rate operation of sulfur/mesoporous activated carbon composite electrode for all-solid-state lithium-sulfur batteries

    Taka Ando, Yuta Sato, Takuya Matsuyama, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of the Ceramic Society of Japan   128 ( 5 )   233 - 237   2020.05( ISSN:1882-0743

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    ©2020 The Ceramic Society of Japan. All rights reserved. All-solid-state lithium-sulfur batteries are promising from the perspective of high safety, low cost, and high capability. Herein, composites of sulfur and microporous carbon (MSP20, MSC30) are prepared by a melt diffusion process, and their performance as electrode materials are compared with that of composites based on nanocarbons. In addition to the type of carbon, the degree of mixing with solid electrolytes is an important factor in the formation of ionic/electronic conduction pathways. The all-solid-state cell using S-MSC30-Li3PS4 shows a high initial discharge capacity of 1488 mAh per gram of sulfur at 25 °C at a current density of 1.3 mA cm12 and operates reversibly at a high current density of 12.7 mA cm12 (3C) at 100 °C. The amorphization of sulfur is effective for obtaining high capacity and sulfur impregnated into the meso- and micropores of carbon is more active than sulfur that forms nanocom osites with nanocarbon

    DOI: 10.2109/jcersj2.20003

  • High-Rate Operation of Sulfur/Mesoporous Activated Carbon Composite Electrode for All-Solid-State Lithium-Sulfur Batteries Reviewed

    T. Ando, Y. Sato, T. Matsuyama, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Ceram. Soc. Jpn. 雑誌   128 ( 5 )   233 - 237   2020.04

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  • How Certain Are the Reported Ionic Conductivities of Thiophosphate-Based Solid Electrolytes? An Interlaboratory Study

    Saneyuki Ohno, Tim Bernges, Johannes Buchheim, Marc Duchardt, Anna Katharina Hatz, Marvin A. Kraft, Hiram Kwak, Aggunda L. Santhosha, Zhantao Liu, Nicolò Minafra, Fumika Tsuji, Atsushi Sakuda, Roman Schlem, Shan Xiong, Zhenggang Zhang, Philipp Adelhelm, Hailong Chen, Akitoshi Hayashi, Yoon Seok Jung, Bettina V. Lotsch, Bernhard Roling, Nella M. Vargas-Barbosa, Wolfgang G. Zeier

    ACS Energy Letters   5 ( 3 )   910 - 915   2020.03

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  • Operando Confocal Microscopy for Dynamic Changes of Li<sup>+</sup> Ion Conduction Path in Graphite Electrode Layers of All-Solid-State Batteries

    Misae Otoyama, Hiroe Kowada, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of Physical Chemistry Letters   11 ( 3 )   900 - 904   2020.02

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    Copyright © 2020 American Chemical Society. The dynamic changes of ionic conduction path in the cross-sectional graphite composite electrodes of bulk-type all-solid-state lithium batteries have been monitored using operando confocal microscopic observations for color changes of graphite in response to their stage structures. The ionic conduction path decreased in the cross-sectional direction as cycle numbers increased, with simultaneous capacity degradation. The local reactivity of lithiation and delithiation was evaluated by image analysis considering state-of-charge (SOC) values. Electrode thickness changes were examined from the confocal microscope images obtained in the operando observations. The results revealed that voids and cracks were formed during cycle tests and that the thickness gradually increased. These cracks and voids were one of the main contributors to the limitation of ionic conduction paths in the depth direction. Operando microscopic observation and subsequent image analysis elucidated not only the morphological changes of active materials but also the differences in local SOC changes in the electrode.

    DOI: 10.1021/acs.jpclett.9b03456

    PubMed

  • Dry coating of active material particles with sulfide solid electrolytes for an all-solid-state lithium battery Reviewed

    Hideya Nakamura, Takashi Kawaguchi, Tomoyuki Masuyama, Atsushi Sakuda, Toshiya Saito, Kentaro Kuratani, Shuji Ohsaki, Satoru Watano

    Journal of Power Sources   448   2020.02( ISSN:0378-7753

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    © 2019 Elsevier B.V. In this study, we present a dry coating process to produce a core-shell composite particle for an all-solid-state lithium battery, where a single particle of the active material is coated with solid electrolytes. LiNi1/3Co1/3Mn1/3O2 (NCM) and Li3PS4 (LPS), which are typical cathode active material and sulfide solid electrolyte, were used. A dry impact-blending device was employed for the dry coating process. We demonstrated that a single particle of NCM was uniformly coated with a continuous layer of LPS by the dry coating process without any breakage or attrition of NCM, to produce an NCM@LPS core-shell particle. The charge-discharge cycling tests showed that the rate and cycle performances of an all-solid-state half-cell prepared with the NCM@LPS core-shell particles significantly improved. The three-dimensional internal structure of the composite cathode was subsequently analyzed using FIB-SEM with an image reconstruction technique. The results revealed that the composite cathode prepared with the NCM@LPS core-shell particles had a (i) high interfacial contact area between NCM and LPS and (ii) well-percolated ion transport pathway. In conclusion, the core-shell composite particle contributed to the structure of the composite cathode, thus resulting in improved cell performance.

    DOI: 10.1016/j.jpowsour.2019.227579

  • How Certain Are the Reported Ionic Conductivities of Thiophosphate-Based Solid Electrolytes? An Interlaboratory Study Reviewed

    S. Ohno, T. Bernges, J. Buchheim, M. Duchardt, A.-K. Hatz, M. A. Kraft, H. Kwak, A. L. Santhosha, Z. Liu, N. Minafra, F. Tsuji, A. Sakuda, R. Schlem, S. Xiong, Z. Zhang, P. Adelhelm, H. Chen, A. Hayashi, Y. S. Jung, B. V. Lotsch, B. Roling, N. M. Vergas-Barbosa, W. G. Zeier

    ACS Energy Lett. 雑誌   5   910 - 915   2020.02

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  • Aqueous Solution Synthesis of Na3SbS4-Na2WS4 Superionic Conductors Reviewed

    S. Yubuchi, A. Ito, N. Masuzawa, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Mater. Chem. A. 雑誌   8   1947 - 1954   2020.02

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  • Quasi-Solid Electrolytes Comprising Sulfide Electrolyte and Carboxylate Esters: Investigation of the Influence of the Carboxylate Ester Structure

    Kei Shimamoto, Atsushi Sakuda, Masahiro Tatsumisago, Akitoshi Hayashi

    Journal of the Electrochemical Society   167 ( 12 )   2020.01( ISSN:0013-4651

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    © 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited. Composite quasi-solid electrolytes composed of Li3PS4 (LPS) glass and a carboxylate ester were prepared via planetary ball milling, and the influence of the molecular structure of the carboxylate esters on their ion-conduction was investigated. The results revealed that filling the voids in the solid electrolyte with a bulky carboxylate ester, which hardly reacted with the LPS glass, effectively maintains the high ionic conductivity of the LPS glass even when the relative density of LPS decreases. The use of this composite quasi-solid electrolyte is an effective approach to maintain the ion-conduction in not only an electrolyte separator layer but also a composite electrode layer in an all-solid-state battery.

    DOI: 10.1149/1945-7111/abacec

  • Operando Confocal Microscopy for Dynamic Changes of Li+ Ion Conduction Path in Graphite Electrode Layers of All-Solid-State Batteries Reviewed

    M. Otoyama, H. Kowada, A. Sakuda, M. Tatsumisago and A. Hayashi

    J. Phys. Chem. Lett. 雑誌   11   900 - 904   2020.01

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  • Dry Coating of Active Material Particles with Sulfide Solid Electrolytes for an All-Solid-State Lithium Battery Reviewed

    H. Nakamura, T. Kawaguchi, T. Masuyama, A. Sakuda, T. Saito, K. Kuratani, S. Ohsaki, S. Watano

    J. Power Sources 雑誌   448 ( 227579 )   1 - 10   2020.01

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  • Electrode performance of amorphous MoS<sub>3</sub> in all-solid-state sodium secondary batteries

    城田岳, 奈須滉, 出口三奈子, 作田敦, 辰巳砂昌弘, 林晃敏

    電池討論会PDF要旨集(CD-ROM)   61st   2020

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    All-solid-state Na–S secondary batteries that use sodium and sulfur, both available in abundance, are the most attractive next-generation batteries. In this study, two types of amorphous MoS3 (a-MoS3) were prepared as electrode active materials for use in all-solid-state sodium secondary batteries using the thermal decomposition (TD) of (NH4)2MoS4 and mechanochemical (MC) processes, denoted a-MoS3 (TD) and a-MoS3 (MC), respectively. X-ray diffraction, thermogravimetric-differential thermal analysis, and X-ray photoelectron spectroscopy (XPS) analyses revealed that a-MoS3 (TD) and a-MoS3 (MC) had different local structures. The a-MoS3 (TD) and a-MoS3 (MC) electrodes showed high reversible capacities of 310 mAh g−1 and 260 mAh g−1, respectively, for five cycles in all-solid-state sodium secondary batteries. XPS analysis of the discharge–charge products suggested that the dissociation and formation of disulfide bonds occurred during the discharge–charge reaction. The results show that a-MoS3 is a promising active electrode material for all-solid-state sodium batteries.

    DOI: 10.1016/j.powera.2021.100061

    J-GLOBAL

  • Preparation and characterization of sodium ion conductive Na<sub>3</sub>BS<sub>3</sub> glass electrolyte

    辻史香, 奈須滉, 作田敦, 辰巳砂昌弘, 林晃敏, 林晃敏

    電池討論会PDF要旨集(CD-ROM)   61st ( 5 )   1676 - 1682   2020

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    In order to find suitable solid electrolytes for all-solid-state sodium batteries, sulfide electrolytes composed of tetrahedral structural units such as PS4, SnS4 and SbS4 have been widely studied. In this paper, the ionic conductivities of Na3BS3ortho-thioborate electrolytes with triangular BS3 units are firstly reported. Na3BS3 glass was prepared via a mechanochemical process from crystalline Na3BS3 (monoclinic phase). The crystalline Na3BS3 was pre-synthesized from a mixture of Na2S, B, and S due to the instability of the B2S3 compound. A new metastable phase of trigonal Na3BS3 was precipitated as the primary phase by crystallization of the Na3BS3 glass. The prepared glass-ceramic electrolyte showed a higher ionic conductivity than the monoclinic Na3BS3 phase. The Na3BS3 glass showed the highest conductivity of 1.1 × 10-5 S cm-1, which was higher than that of conventional Na3PS4 glass. Futhermore, the Na3BS3 glass showed a superior formability and electrochemical stability to Na15Sn4 negative electrode. An all-solid-state cell with the Na3BS3 glass as an electrolyte successfully operated as a secondary battery at 60 °C. It is concluded that the Na3BS3 glass with triangular structural units has appropriate properties as a solid electrolyte for application to all-solid-state sodium batteries. The results of this study extend research on multi-component sulfide electrolytes with triangular BS3 structural units and contribute to the development of solid electrolytes for all-solid-state batteries. This journal is

    DOI: 10.1039/d0ma00777c

    J-GLOBAL

  • Aqueous solution synthesis of Na<inf>3</inf>SbS<inf>4</inf>-Na<inf>2</inf>WS<inf>4</inf> superionic conductors

    So Yubuchi, Akane Ito, Naoki Masuzawa, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of Materials Chemistry A   8 ( 4 )   1947 - 1954   2020( ISSN:2050-7488

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    © The Royal Society of Chemistry. We report a route for the synthesis of Na3SbS4-Na2WS4 superionic conductors from aqueous solution. Na3SbS4-Na2WS4 has the highest high sodium-ion conductivity (4.28 mS cm-1 at 25 °C) of reported sulfide-based solid electrolytes prepared via liquid-phase methods. The antimony in Na3SbS4 is replaced by tungsten in a higher valence state, which is charge-compensated by sodium vacancies in the form Na3-xSb1-xWxS4. Introducing sodium vacancies while maintaining the 3D conduction pathways increases the pre-exponential factor in the Arrhenius plots of ionic conduction. The development of a facile synthetic protocol, as well as the high ionic conductivity and excellent chemical stability of Na3SbS4-Na2WS4 in the presence of water, is a major step towards the realization of all-solid-state sodium batteries.

    DOI: 10.1039/c9ta02246e

  • A sodium-ion sulfide solid electrolyte with unprecedented conductivity at room temperature

    A. Hayashi, N. Masuzawa, S. Yubuchi, F. Tsuji, C. Hotehama, A. Sakuda, M. Tatsumisago

    Nature Communications   10 ( 1 )   2019.12

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    Solid electrolytes are key materials to enable solid-state rechargeable batteries, a promising technology that could address the safety and energy density issues. Here, we report a sulfide sodium-ion conductor, Na2.88Sb0.88W0.12S4, with conductivity superior to that of the benchmark electrolyte, Li10GeP2S12. Partial substitution of antimony in Na3SbS4 with tungsten introduces sodium vacancies and tetragonal to cubic phase transition, giving rise to the highest room-temperature conductivity of 32 mS cm−1 for a sintered body, Na2.88Sb0.88W0.12S4. Moreover, this sulfide possesses additional advantages including stability against humid atmosphere and densification at much lower sintering temperatures than those (>1000 °C) of typical oxide sodium-ion conductors. The discovery of the fast sodium-ion conductors boosts the ongoing research for solid-state rechargeable battery technology with high safety, cost-effectiveness, large energy and power densities.

    DOI: 10.1038/s41467-019-13178-2

    PubMed

    Other URL: http://www.nature.com/articles/s41467-019-13178-2

  • Sulfur-Based Composite Electrode with Interconnected Mesoporous Carbon for All-Solid-State Lithium–Sulfur Batteries Reviewed

    Atsushi Sakuda, Yuta Sato, Akitoshi Hayashi, Masahiro Tatsumisago

    Energy Technology   7 ( 12 )   1 - 5   2019.12( ISSN:2194-4288

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    © 2019 WILEY-VCH Verlag GmbH &amp; Co. KGaA, Weinheim All-solid-state lithium–sulfur batteries have attracted much attention because of their large capacity and long life. However, their rate capability is not sufficiently high, prompting a great demand for improvement. Herein, a sulfur-based composite electrode is fabricated for the high-rate operation of all-solid-state lithium–sulfur batteries. The electrode is made of a carbon material having a large number of “interconnected mesopores” with a diameter of 5 nm. The highly mesoporous structure is conducive to electrode reactions and the formation of conduction pathways. Consequently, the rate capability of the composite electrode is drastically improved compared with that of an electrode made of conventional conducting nanocarbon. The all-solid-state lithium–sulfur battery with this composite electrode shows a high capacity of 1100 mA h g −1 per sulfur after 400 cycles at a high current density of 1.3 mA cm −2 at 25 °C. These findings are expected to contribute toward the development of practical all-solid-state lithium–sulfur batteries.

    DOI: 10.1002/ente.201900077

  • Microstructure and conductivity of Al-substituted Li<inf>7</inf>La<inf>3</inf>Zr<inf>2</inf>O<inf>12</inf> ceramics with different grain sizes Reviewed

    Yuma Matsuki, Kousuke Noi, K. Suzuki, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Solid State Ionics   342   2019.12( ISSN:0167-2738

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    © 2019 Elsevier B.V. Al-doped Li7La3Zr2O12 (LLZ) sintered ceramics with two grain sizes were prepared to investigate the relationship between their microstructure and conducting properties. The X-ray diffraction patterns showed no difference in the peak shift and intensity between the two prepared LLZ ceramics, suggesting that their bulk conductivities were almost the same. Scanning electron microscopy and energy dispersive X-ray spectrometry were used to observe their microstructure. Neither of the ceramics had an obvious impurity phase along grain boundaries. One of LLZ (LLZ_LG) had a larger grain size of 5–20 μm and showed intergranular fracture. The other LLZ (LLZ_SG) had a smaller grain size of primarily &lt;1 μm and showed intragranular fracture. LLZ_LG showed a total conductivity of 3.6 × 10−4 S cm−1 and an activation energy, Ea, for conduction of 32 kJ mol−1, while LLZ_SG showed conductivity of 4.4 × 10−4 S cm−1 and Ea of 26 kJ mol−1. It is noteworthy that the grain boundary composed of small grains showed lower grain boundary resistance than that composed of large grains. As a result, it is clarified that LLZ ceramics with higher ion-conductivity and lower Ea can be prepared by suppressing grain growth.

    DOI: 10.1016/j.ssi.2019.115047

  • Microstructure and Conductivity of Al-Substituted Li7La3Zr2O12 Ceramics with Different Grain Sizes Reviewed

    Y. Matsuki, K. Noi, K. Suzuki, A. Sakuda, A. Hayashi and M. Tatsumisago

    Solid State Ionics 雑誌   342 ( 115047 )   1 - 6   2019.12

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  • Sulfur-Based Comosite Electrode with Interconnected Mesoporous Carbon for All-Solid-State Lithium-Sulfur Batteries Reviewed

    A. Sakuda, Y. Sato, A. Hayashi and M. Tatsumisago

    Energy Technol. 雑誌   7 ( 1900077 )   1 - 5   2019.12

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  • A Sodium-ion Sulfide Solid Electrolyte with Unprecedented Conductivity at Room Temperature Reviewed

    A. Hayashi, N. Masuzawa, S. Yubuchi, F. Tsuji, C. Hotehama, A. Sakuda and M. Tatsumisago

    Nat. Commun. 雑誌   10:5266   1 - 6   2019.11

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  • New lithium-conducting nitride glass Li<inf>3</inf>BN<inf>2</inf> Reviewed

    Manari Shigeno, Kenji Nagao, Minako Deguchi, Chie Hotehama, Hiroe Kowada, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Solid State Ionics   339   2019.10( ISSN:0167-2738

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    © 2019 Elsevier B.V. Novel nitride glass electrolyte Li3BN2 was prepared from Li3N and BN via a mechanochemical process using planetary ball milling. Raman and X-ray photoelectron spectroscopies revealed that the glass was composed of Li+ and BN23− ions. The Li3BN2 glass exhibited good ductility, and the powder-compressed pellet showed a relative density of 84%. The hot-pressed pellet of the Li3BN2 glass showed a conductivity of 1.3 × 10−5 S cm−1 at 25 °C, which is much higher than that of oxide-based glass electrolytes such as Li3BO3 glass and LiPON thin films. Moreover, Young&#039;s modulus of the Li3BN2 glass was 51.1 GPa, which is an intermediate value between sulfides and oxides. The Li symmetric cell using the Li3BN2 glass electrolyte was cycled stably at 100 °C without short-circuiting. Nitride glassy materials are promising electrolytes for all-solid-state batteries because of their high conductivity, good mechanical properties, and electrochemical stability.

    DOI: 10.1016/j.ssi.2019.05.020

  • Mechanochemical Synthesis and Characterization of Amorphous Li2CN2 as a Lithium Ion Conductor Reviewed

    T. Kimura, C. Hotehama, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Ceram. Soc. Jpn 雑誌   127 ( 8 )   518 - 520   2019.08

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  • Mechanochemical Synthesis of Na-Sb Alloy Negative Electrodes and their Application to All-Solid-State Sodium Batteries Reviewed

    T. Ando, S. Yubuchi, A. Sakuda, A. Hayashi and M. Tatsumisago

    Electrochemistry 雑誌   87 ( 5 )   289 - 293   2019.08

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  • Metastable Materials for All-Solid-State Batteries Reviewed

    A. Sakuda, A. Hayashi and M. Tatsumisago

    Electrochemistry 雑誌   87 ( 5 )   247 - 250   2019.08

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  • Mechanochemical Synthesis of Cubic Rocksalt Na3TiS3 as Novel Active Materials for All-Solid-State Sodium Secondary Batteries Reviewed

    A. Nasu, M. Otoyama, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Ceram. Soc. Jpn 雑誌   127 ( 8 )   514 - 517   2019.08

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  • Mechanochemical synthesis and characterization of amorphous Li<inf>2</inf>CN<inf>2</inf> as a lithium ion conductor Reviewed

    Takuya Kimura, Chie Hotehama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of the Ceramic Society of Japan   127 ( 8 )   518 - 520   2019.08( ISSN:1882-0743

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    Drastically higher conductivity was found in the amorphous lithium-ion conducting nitride relative to the crystal. The amorphous Li2CN2 prepared by a mechanochemical process has the conductivity of 1.1 © 1016 S cm11 at 25°C, which is more than 1000 times higher than that of the crystalline form. The nitride has a better deformability compared to Li3BO3 oxide glass.

    DOI: 10.2109/jcersj2.19077

  • Mechanochemical synthesis of cubic rocksalt Na<inf>2</inf>TiS<inf>3</inf> as novel active materials for all-solid-state sodium secondary batteries Reviewed

    Akira Nasu, Misae Otoyama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of the Ceramic Society of Japan   127 ( 8 )   514 - 517   2019.08( ISSN:1882-0743

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    Mechanochemical (MC) process is one of the most effective methods to produce amorphous and cation disordered electrode active materials. We individually synthesized amorphous and cation disordered cubic rocksalt Na2TiS3 by controlling the preparation conditions of the MC process. Cubic rocksalt Na2TiS3 and ordered monoclinic Na2TiS3 were also obtained via the heat treatment of amorphous Na2TiS3. The all-solid-state cell with cubic rocksalt Na2TiS3 showed a high reversible capacity of 270 mAh g11, which corresponds to the theoretical capacity of Na2TiS3. The cell maintained the capacity for more than 30 cycles, indicating that the active materials can endure long operation life. The MC methods for transition metal sulfides and the search for ordered monoclinic polymorphs are necessary for the pursuit of novel electrode materials.

    DOI: 10.2109/jcersj2.19086

  • Suspension synthesis of Na<inf>3-x</inf>PS<inf>4-x</inf>Cl<inf>x</inf> solid electrolytes Reviewed

    Miwa Uematsu, So Yubuchi, Fumika Tsuji, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of Power Sources   428   131 - 135   2019.07( ISSN:0378-7753

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    © 2019 Elsevier B.V. All-solid-state sodium batteries with sulfide-based solid electrolytes are attracting attention as next-generation energy storage systems to replace Li-ion batteries, owing to their improved safety and the abundant sodium resources. Na 3 PS 4 -based materials, which have relatively high conductivities and favorable mechanical properties, make promising Na-ion solid electrolytes for realizing all-solid-state sodium batteries. However, it is essential to establish a further simple and effective protocol for manufacturing such solid electrolytes and composite electrodes. In this study, Na 3-x PS 4-x Cl x (x = 0, 0.0625) was prepared by a liquid-phase (suspension) process from Na 2 S, P 2 S 5 , and NaCl using 1,2-dimethoxyethane as a reaction media. Na 3 PS 4 heated at 400 °C and Na 2.9375 PS 3.9375 Cl 0.0625 heated at 480 °C exhibited Na-ion conductivities of 2.6 × 10 −4 and 4.3 × 10 −4 S cm −1 at 25 °C, respectively. A homogenous composite electrode was prepared with TiS 2 active material and Na 3 PS 4 solid electrolyte via the simple liquid-phase process, resulting in large contact areas between electrode and electrolyte particles. The electrode obtained by liquid-phase provided an all-solid-state cell with higher reversible capacity of 161 mAh g −1 than a conventional mechanically mixed electrode. Suspension syntheses of Na 3-x PS 4-x Cl x are useful for the simple production of solid electrolytes and are highly applicable to all-solid-state sodium batteries.

    DOI: 10.1016/j.jpowsour.2019.04.069

  • Formation of interfacial contact with ductile Li<inf>3</inf>BO<inf>3</inf>-based electrolytes for improving cyclability in all-solid-state batteries Reviewed

    Kenji Nagao, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of Power Sources   424   215 - 219   2019.06( ISSN:0378-7753

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    © 2019 Elsevier B.V. Highly safe all-solid-state batteries are constructed using oxide electrolytes because of their high chemical and electrochemical stabilities. Previously, we have developed various Li 3 BO 3 -based glass-ceramic electrolytes with high ductility and conductivity. In this study, we focus on the importance of electrode/electrolyte interfacial contacts in all-solid-state batteries. All-oxide solid-state cells (Li-In/LiNi 1/3 Mn 1/3 Co 1/3 O 2 ) with Li 3 BO 3 -based glass-ceramic electrolytes, are fabricated simply by pressing at room temperature. Furthermore, the effects of the ductility and ionic conductivity of glass-ceramic electrolytes on the charge-discharge properties of all-solid-state batteries are investigated. The 33Li 3 BO 3 ·33Li 2 SO 4 ·33Li 2 CO 3 (mol%) glass-ceramic electrolyte shows lower ionic conductivity and better ductility than the 90Li 3 BO 3 ·10Li 2 SO 4 electrolyte. The all-solid-state cells using these electrolytes operate as secondary batteries at 100 °C. However, better cycle performance is obtained with cells using the former electrolyte. Formation of well-contacted electrode/electrolyte interfaces when using highly ductile electrolytes leads to enhanced electrochemical performance of bulk-type all-solid-state batteries.

    DOI: 10.1016/j.jpowsour.2019.03.083

  • Ion-exchange Synthesis of Li2NaPS4 from Na3PS4 Reviewed

    J. Chen, S. Yubuchi, C. Hotehama, A. Sakuda, A. Hayashi and M. Tatsumisago

    Chem. Lett. 雑誌   48   863 - 865   2019.06

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  • Amorphous Ni-Rich Li(Ni1-x-yMnxCoy)O2-Li2SO4 Positive Electrode Materials for Bulk-Type All-Oxide Solid-State Batteries Reviewed

    K. Nagao, A. Sakuda, A. Hayashi, H. Tsukasaki, S. Mori and M. Tatsumisago

    Adv. Mater. Interfaces 雑誌   6 ( 1802016 )   1 - 10   2019.06

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  • Highly Stable Li/Li<inf>3</inf>BO<inf>3</inf>-Li<inf>2</inf>SO<inf>4</inf> Interface and Application to Bulk-Type All-Solid-State Lithium Metal Batteries Reviewed

    Kenji Nagao, Motoshi Suyama, Atsutaka Kato, Chie Hotehama, Minako Deguchi, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    ACS Applied Energy Materials   2 ( 5 )   3042 - 3048   2019.05( ISSN:2574-0962

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    © 2019 American Chemical Society. All-solid-state batteries (ASSBs) are potentially safe energy storage devices. The 90Li3BO3·10Li2SO4 (mol %) glass-ceramic is one of the promising oxide electrolytes due to its high ductility and ionic conductivity. Utilization of Li metal negative electrode enhances the energy density of ASSBs. Herein, the high electrochemical stability of the 90Li3BO3·10Li2SO4 electrolyte against Li metal negative electrode was demonstrated. The symmetric cells using a dense electrolyte body with relative density of 99% synthesized by the hot-pressing technique showed excellent cycle performance for the Li dissolution and deposition reactions. Finally, the all-solid-state (Li/80LiNi0.5Mn0.3Co0.2O2·20Li2SO4) full cell operated as a secondary battery at 100 °C.

    DOI: 10.1021/acsaem.9b00470

  • Preparation and characterization of lithium ion conductive Li <inf>3</inf> SbS <inf>4</inf> glass and glass-ceramic electrolytes Reviewed

    Takuya Kimura, Atsutaka Kato, Chie Hotehama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Solid State Ionics   333   45 - 49   2019.05( ISSN:0167-2738

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    © 2019 Elsevier B.V. Li 3 SbS 4 glass was prepared by a mechanochemical process and a glass-ceramic was prepared by heating the glass above the crystallization temperature. The glass-ceramic had a crystal structure similar to that of γ-Li 3 PS 4 . As indicated by the Raman spectra, both electrolytes contained an SbS 4 unit. The conductivity of the pelletized Li 3 SbS 4 glass was 1.5 × 10 −6 S·cm −1 at 25 °C, which was higher than that of its glass-ceramic. The amount of H 2 S generated from Li 3 SbS 4 glass in humid air was considerably lower than that from the Li 3 PS 4 glass.

    DOI: 10.1016/j.ssi.2019.01.017

  • Suspension Synthesis of Na3-xPS4-xClx Solid Electrolytes Reviewed

    M. Uematsu, S. Yubuchi, F. Tsuji, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Power Sources 雑誌   428   131 - 135   2019.05

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  • Highly Stable Li/Li3BO3-Li2SO4 Interface and Application to Bulk-Type All-Solid-State Lithium Metal Batteries Reviewed

    K. Nagao, M. Suyama, A. Kato, C. Hotehama, M. Deguchi, A. Sakuda, A. Hayashi and M. Tatsumisago

    ACS Appl. Energy Mater. 雑誌   2   3042 - 3048   2019.05

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  • New Lithium-Conducting Nitride Glass Li3BN2 Reviewed

    M. Shigeno, K. Nagao, M. Deguchi, C. Hotehama, H. Kowada, A. Sakuda, A. Hayashi and M. Tatsumisago

    Solid State Ionics 雑誌   339   2019.05

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  • Morphological Effect of Reaction Distribution Influenced by Binder Materials in Composite Electodes for Sheet-type All-Solid-State Lithium-Ion Batteries with the Sulfide-based Solid Electrolyte Reviewed

    K. Chen, S. Shinjo, A. Sakuda, K. Yamamoto, T. Uchiyama, K. Kuratani, T. Kakeuchi, Y. Orikasa, A. Hayashi, M. Tatsumisago, Y. Kimura, T. Nakamura, K. Amezawa and Y. Uchimoto

    J. Phys. Chem. C 雑誌   123   3292 - 3298   2019.05

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  • Quantitative Analysis of Crystallinity in an Argyrodite Sulfide-based Solid Electrolyte Synthesized Via Solution Processing Reviewed

    S. Yubuchi, H. Tsukasaki, A. Sakuda, S. Mori, A. Hayashi and M. Tatsumisago

    RSC Adv. 雑誌   9   14465 - 14471   2019.05

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  • Formation of Interfacial Contact with Ductile Li3BO3-based Electrolytes for Improving Cyclability in All-Solid-State Batteries Reviewed

    K. Nagao, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Power Sources 雑誌   424   215 - 219   2019.04

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  • Amorphous Ni-Rich Li(Ni <inf>1−</inf><inf>x</inf><inf>−</inf><inf>y</inf> Mn <inf>x</inf> Co <inf>y</inf> )O <inf>2</inf> –Li <inf>2</inf> SO <inf>4</inf> Positive Electrode Materials for Bulk-Type All-Oxide Solid-State Batteries Reviewed

    Kenji Nagao, Atsushi Sakuda, Akitoshi Hayashi, Hirofumi Tsukasaki, Shigeo Mori, Masahiro Tatsumisago

    Advanced Materials Interfaces   6 ( 8 )   2019.04( ISSN:2196-7350

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    © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim All-solid-state batteries attract significant attention owing to their potential to realize an energy storage system with high safety and energy density. In this paper, a mechanochemical synthesis of novel amorphous positive electrode materials of the Ni-rich LiNi 1−x−y Mn x Co y O 2 (NMC)–Li 2 SO 4 system suitable for oxide-type all-solid-state batteries is reported. Through the mechanochemical treatment with Li 2 SO 4 , excellent formabilities of the electrode materials as those of ductile solid electrolytes are obtained. Owing to the deformability of the active material, a good electrode/electrolyte interface is provided simply by pressing at room temperature. In all-oxide solid-state cells using 80NMCs·20Li 2 SO 4 (mol%) positive electrode materials, the cell capacity increases with the Ni content in the NMC. The all-solid-state cell using the 80NMC811·20Li 2 SO 4 positive electrode active material exhibits a high capacity larger than 250 mAh g −1 in a voltage range of 1.6–4.8 V versus Li at 100 °C. Furthermore, bulk-type all-oxide solid-state batteries (Li 4 Ti 5 O 12 /80NMC532·20Li 2 SO 4 (mol%)) successfully function as secondary batteries with excellent cycle performances.

    DOI: 10.1002/admi.201802016

  • All-solid-state cells with Li<inf>4</inf>Ti<inf>5</inf>O<inf>12</inf>/carbon nanotube composite electrodes prepared by infiltration with argyrodite sulfide-based solid electrolytes via liquid-phase processing Reviewed

    So Yubuchi, Wataru Nakamura, Thomas Bibienne, Steeve Rousselot, Lauren W. Taylor, Matteo Pasquali, Mickaël Dollé, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of Power Sources   417   125 - 131   2019.03( ISSN:0378-7753

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    © 2019 Elsevier B.V. All-solid-state cells are safe, and have high energy densities and power densities. Sulfide-based solid electrolytes (SEs) exhibit high ionic conductivities and favorable mechanical properties allowing for the facile preparation of all-solid-state cells via simple mixing and cold-pressing processes. For practical applications, it is necessary to produce SEs and all-solid-state cells more efficiently. Herein, a novel fabrication process for homogeneous composite electrodes used in all-solid-state cells was successfully demonstrated using an infiltration technique. The Li 4 Ti 5 O 12 and carbon nanotube (LTO@CNT) porous electrode was infiltrated with a precursor solution containing an argyrodite Li 6 PS 5 Br SE, and the solvent was removed by drying at 150 °C under vacuum to prepare an infiltrated SE-LTO@CNT electrode. The process without conventional mixing formed an electrochemically active interface with a large contact area and favorable conduction pathways. The all-solid-state cell with the SE-LTO@CNT electrode showed an improved capacity of 163 mAh g −1 compared to those prepared with the dry-mixed electrodes at 25 °C, and the high capacity was maintained for 500 cycles. Moreover, the cell with the SE-LTO@CNT electrode showed a reversible capacity of 100 mAh g −1 or more at 4 C-rate and 100 °C. Thus, the infiltration process is effective for the practical fabrication and application of all-solid-state cells.

    DOI: 10.1016/j.jpowsour.2019.01.070

  • Fast Cationic and Anionic Redox Reactions in Li<inf>2</inf>RuO<inf>3</inf>-Li<inf>2</inf>SO<inf>4</inf> Positive Electrode Materials Reviewed

    Kenji Nagao, Atsushi Sakuda, Wataru Nakamura, Akitoshi Hayashi, Masahiro Tatsumisago

    ACS Applied Energy Materials   2 ( 3 )   1594 - 1599   2019.03( ISSN:2574-0962

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    © 2019 American Chemical Society. For the application of lithium-ion batteries (LiBs) to a large-scale power source for electric vehicles, positive electrode materials with high energy and power densities should be developed. Although Li-excess materials are regarded as high-capacity positive electrodes, there are several issues in the anionic redox reactions, such as oxygen gas evolution and large resistance, which lead to capacity fading and limitation of high-current operation. Here, we report the high-current operation of an electrochemical cell using the Li 2 RuO 3 -Li 2 SO 4 positive electrode in LiBs. The cell using Li 2 Ru 0.8 S 0.2 O 3.2 showed a high capacity of 350 mAh g -1 with an average discharge voltage of 2.9 V vs Li at 25 °C. By introducing an amorphous matrix based on Li 2 SO 4 , a high diffusion coefficient was maintained during the whole charge-discharge process, and low charge-transfer resistance was maintained even at a high oxidation state up to 4.2 V vs Li. As a result, extremely high current operation, such as 40 C rate, was achieved.

    DOI: 10.1021/acsaem.8b02163

  • Liquid-phase syntheses of sulfide electrolytes for all-solid-state lithium battery Reviewed

    Akira Miura, Nataly Carolina Rosero-Navarro, Atsushi Sakuda, Kiyoharu Tadanaga, Nguyen H.H. Phuc, Atsunori Matsuda, Nobuya Machida, Akitoshi Hayashi, Masahiro Tatsumisago

    Nature Reviews Chemistry   3 ( 3 )   189 - 198   2019.03( ISSN:2397-3358

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    © 2019, Springer Nature Limited. Solid sulfide electrolytes are key materials in all-solid-state lithium batteries because of their high lithium-ion conductivity and deformability, which enable the lithium-ion path to be connected between the material’s grain boundaries under pressure near room temperature. However, sulfur species are moisture-sensitive and exhibit high vapour pressures; therefore, syntheses of sulfide electrolytes need to be carefully designed. Liquid-phase reactions can be performed at low temperatures in controlled atmospheres, opening up the prospect of scalable processes for the preparation of sulfide electrolytes. Here, we review liquid-phase syntheses for the preparation of sulfide-based solid electrolytes and composites of electrolytes and electrodes, and we compare the charge–discharge performances of the all-solid-state lithium batteries using these components.

    DOI: 10.1038/s41570-019-0078-2

  • Morphological Effect on Reaction Distribution Influenced by Binder Materials in Composite Electrodes for Sheet-type All-Solid-State Lithium-Ion Batteries with the Sulfide-based Solid Electrolyte Reviewed

    Kezheng Chen, Sae Shinjo, Atsushi Sakuda, Kentaro Yamamoto, Tomoki Uchiyama, Kentaro Kuratani, Tomonari Takeuchi, Yuki Orikasa, Akitoshi Hayashi, Masahiro Tatsumisago, Yuta Kimura, Takashi Nakamura, Koji Amezawa, Yoshiharu Uchimoto

    Journal of Physical Chemistry C   123 ( 6 )   3292 - 3298   2019.02( ISSN:1932-7447

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    © 2019 American Chemical Society. In sheet-type all-solid-state lithium-ion batteries with the sulfide-based solid electrolyte, composite electrodes consist of active material, solid electrolyte, conductive additive material, and binder. Thus, they form a three-dimensional ionic and electronic conduction pass. In composite electrodes, the reaction inhomogeneity derived from their morphology exerts a remarkable effect on battery performance. In this study, we prepared sheet-type composite electrodes for all-solid-state lithium-ion batteries with the sulfide-based solid electrolyte using different binder materials with different solvents and investigated the reaction distribution within the electrodes using the 2D-imaging X-ray absorption spectroscopy. Thus, we demonstrated that the dominant factor of the reaction distribution formation is the ionic conduction, depending on the structure of the composite electrode, and that the structure is influenced by the combination between the binder and the solvent used in the preparation of the sheet-type composite electrode.

    DOI: 10.1021/acs.jpcc.8b09569

  • Liquid-Phase Syntheses of Sulfide Electrolytes for All-Solid-State Lithium Battery Reviewed

    A. Miura, N.C. Rosero-Navarro, A. Sakuda, K. Tadanaga, N.H.H. Phuc, A. Matsuda, N. Machida, A. Hayashi and M. Tatsumisago

    Nature Reviews Chemistry 雑誌   doi: 10.1038/s41570 - 019   2019.02

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  • Fast Cationic and Anionic Redox Reactions in Li2RuO3-Li2SO4 Positive Electrode Materials Reviewed

    K. Nagao, A. Sakuda, W. Nakamura, A. Hayashi and M. Tatsumisago

    ACS Appl. Energy Mater. 雑誌   2   1594 - 1599   2019.02

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  • Amorphous Na2TiS3 as an Active Material for All-Solid-State Sodium Batteries Reviewed

    A. Nasu, M. Otoyama, A. Sakuda, A. Hayashi and M. Tatsumisago

    Chem. Lett. 雑誌   48   288 - 290   2019.02

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  • Amorphous Na <inf>2</inf> TiS <inf>3</inf> as an active material for all-solid-state sodium batteries Reviewed

    Akira Nasu, Misae Otoyama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Chemistry Letters   48 ( 3 )   288 - 290   2019.01( ISSN:0366-7022

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    © 2019 The Chemical Society of Japan. Amorphous transition metal polysulfides are promising high capacity electrode active materials for sodium secondary batteries. Here we report the superior electrode performance of amorphous Na 2 TiS 3 . Crystalline (c-) and amorphous (a-) Na 2 TiS 3 were prepared by solid phase reaction with heat treatment and mechanochemical reaction, respectively. a-Na 2 TiS 3 showed 10 fold higher ionic conductivity (1.5 © 10 16 S cm 11 ) than that of c-Na 2 TiS 3 . The all-solid-state cells using c-Na 2 TiS 3 and a-Na 2 TiS 3 showed reversible capacities of 110 mAh g 11 and 250 mAh g 11 , respectively. Amorphization of Na 2 TiS 3 is a powerful way to improve electrode performance in all-solid-state sodium secondary batteries.

    DOI: 10.1246/cl.180895

  • Development of Next Generation Battery Materials by Mechanochemical Process Invited Reviewed

    作田敦, 林晃敏, 辰巳砂昌弘

    粉体工学会誌   56 ( 8 )   452 - 458   2019.01( ISSN:0386-6157

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    Copyright © The Japan Institute of Electronics Packaging Mechanochemistry is a study that deals with the interaction between mechanical energy and chemical energy. Mechanochemical reaction is a chemical reaction by mechanical energy. We have synthesized various next-generation battery materials using the mechanochemical method and evaluated their unique properties. In this paper, we review our recent researches on mechanochemical syntheses of sulfide materials as next-generation battery materials.

    DOI: 10.4164/sptj.56.452

    J-GLOBAL

  • Lithium dissolution/deposition behavior of Al-doped Li<inf>7</inf>La<inf>3</inf>Zr<inf>2</inf>O<inf>12</inf> ceramics with different grain sizes Reviewed

    Yuma Matsuki, Kousuke Noi, Minako Deguchi, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of the Electrochemical Society   166 ( 3 )   A5470 - A5473   2019.01( ISSN:0013-4651

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    Publishing type:Research paper (scientific journal)  

    © The Author(s) 2019. Published by ECS. Lithium dissolution/deposition behavior of Al-doped Li7La3Zr2O12 (LLZ) was investigated in terms of grain size of LLZ-sintered bodies. One LLZ had smaller grain sizes of primarily less than 1 μm (LLZ_SG), and the other one had larger grain sizes of 5-20 μm (LLZ_LG). The total resistance of a Li symmetric cell using LLZ_SG was smaller than that using LLZ_LG at 100◦C. The cell using LLZ_SG was stably cycled at 100◦C without short-circuiting at a high current density of 1.3 mA cm−2, while the cell using LLZ_LG was stably cycled at current densities below 0.26 mA cm−2. Stronger bonding at grain boundaries for LLZ_SG was expected to contribute to the improvement of cyclability.

    DOI: 10.1149/2.0661903jes

  • Ion-exchange synthesis of Li<inf>2</inf>NaPS<inf>4</inf> from Na<inf>3</inf>PS<inf>4</inf> Reviewed

    Jin Chen, So Yubuchi, Chie Hotehama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Chemistry Letters   48 ( 8 )   863 - 865   2019.01( ISSN:0366-7022

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    Publishing type:Research paper (scientific journal)  

    © 2019 The Chemical Society of Japan. A novel Li2NaPS4 crystal was successfully prepared from tetragonal Na3PS4 via Na+/Li+ ion-exchange in an acetonitrile solution of lithium bis(fluorosulfonyl)amide at room temperature. Its crystal structure was analyzed by powder X-ray diffraction. The Li2NaPS4 crystal maintained the basic anion framework of tetragonal Na3PS4 (P421c). The chemical environment of PS43- units in the ion-exchanged product was similar to that in the Li3PS4 crystal. Ion-exchange synthesis is a promising approach to develop novel sulfide-based materials.

    DOI: 10.1246/cl.190135

  • An argyrodite sulfide-based superionic conductor synthesized by a liquid-phase technique with tetrahydrofuran and ethanol Reviewed

    So Yubuchi, Miwa Uematsu, Chie Hotehama, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Journal of Materials Chemistry A   7 ( 2 )   558 - 566   2019.01( ISSN:2050-7488

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    Publishing type:Research paper (scientific journal)  

    © 2018 The Royal Society of Chemistry. Sulfide-based solid electrolytes with halide elements are essential components of advanced all-solid-state batteries. Argyrodite crystals are viable candidates as solid electrolytes for realizing all-solid-state batteries. However, a simple and effective route for the synthesis of these solid electrolytes is required. Herein, argyrodite Li 6 PS 5 Br superionic conductors were synthesized from a homogeneous solution by a liquid-phase technique. The Li 6 PS 5 Br solid electrolyte was prepared in a shorter synthesis time of one day using tetrahydrofuran and ethanol as compared with the solid-phase method. More importantly, of all the sulfide-based solid electrolytes prepared by liquid-phase techniques, Li 6 PS 5 Br showed the highest ionic conductivity of 3.1 mS cm -1 at 25 °C. The obtained particle size of 1 μm is suitable for application in all-solid-state cells. Moreover, coating electrode active materials with the solid electrolyte using the precursor solution led to a large contact area between the electrode and electrolyte and improved the cell performance. In addition, infiltrating a porous electrode with the precursor solution of the solid electrolyte is suitable for forming homogeneous composite electrodes to improve the cell performance. The all-solid-state cell using the Li 6 PS 5 Br fine powder with a high conductivity of 1 mS cm -1 or more exhibited a reversible capacity of 150 mA h g -1 . This technique is effective for the industrial production of solid electrolytes and is applicable to all-solid-state batteries.

    DOI: 10.1039/c8ta09477b

  • Metastable materials for all-solid-state batteries Reviewed

    Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Electrochemistry   87 ( 5 )   247 - 250   2019.01( ISSN:1344-3542

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    Publishing type:Research paper (scientific journal)  

    © The Electrochemical Society of Japan, All rights reserved. Materials with metastable structures often exhibit high stability up to a certain temperature, despite not being thermodynamically stable. Therefore, it is important to use the excellent physical properties generated by metastable structure. Secondary batteries are an energy device that stores chemical energy by producing thermodynamically metastable materials. Metastable materials can also be directly utilized as the electrode active materials and the solid electrolytes. The rapid quenching and mechanochemical processes are useful to obtain room temperature metastable materials. This review provides an overview of our research progress on glassy and metastable crystalline materials for all-solid-state batteries.

    DOI: 10.5796/electrochemistry.19-H0002

  • Mechanochemical Synthesis of Na-Sb Alloy Negative Electrodes and Their Application to All-solid-state Sodium Batteries Reviewed

    Taka Ando, So Yubuchi, Atsushi Sakuda, Akitoshi Hayashi, Masahiro Tatsumisago

    Electrochemistry   87 ( 5 )   289 - 293   2019.01( ISSN:1344-3542

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    Publishing type:Research paper (scientific journal)  

    © The Electrochemical Society of Japan, All rights reserved. Na-Sb alloy was synthesized as an advanced negative electrode material for all-solid-state sodium batteries by a mechanochemical process. An all-solid-state symmetric cell using a composite of an Na-Sb alloy and Na3PS4 solid electrolyte operated reversibly with a high reversible capacity of 370 mAh g−1 at room temperature under a current density of 0.064 mA cm−2. The composite electrode showed an effective ionic conductivity of 3.4 × 10−5 S cm−1. The cell also operated at 60°C under the same current density with low polarization compared to room temperature operation. The sodiation process from NaSb to Na3Sb was examined by ex situ X-ray diffraction (XRD) measurements. An all-solid-state half-cell using a TiS2 composite electrode and a Na3Sb composite electrode showed a high reversible capacity of 200 mAh g−1 at room temperature under a constant current density of 0.064 mA cm−2. Na-Sb alloys are a suitable negative electrode material for all-solid-state sodium batteries.

    DOI: 10.5796/electrochemistry.19-00014

  • An Argyrodite Sulfide-based Superionic Conductor Synthesized by a Liquid-phase Technique with Tetrahydrofuran and Ethanol Reviewed

    S. Yubuchi, M. Uematsu, C. Hotehama, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Mater. Chem. A 雑誌   7   558 - 566   2019.01

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    Kind of work:Joint Work  

  • Preparation and Characterization of Lithium Ion Conductive Li3SbS4 Glass and Glass-Ceramic Electrolytes Reviewed

    T. Kimura, A. Kato, C. Hotehama, A. Sakuda, A. Hayashi and M. Tatsumisago

    Solid State Ionics 雑誌   333   45 - 49   2019.01

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    Kind of work:Joint Work  

  • All-Solid-State Cells with Li4Ti5O12/Carbon Nanotube Composite Electrodes Prepared by Infiltration with Argyrodite Sulfide-based Solid Electrolytes via Liquid-phase Processing Reviewed

    S. Yubuchi, W. Nakamura, T. Bibienne, S. Rousselot, L. W. Taylor, M. Pasquali, M. Dollé, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Power Sources 雑誌   417   125 - 131   2019.01

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    Kind of work:Joint Work  

  • Lithium Dissolution/Deposition Behavior of Al-Doped Li7La3Zr2O12 Ceramics with Different Grain Sizes Reviewed

    Y. Matsuki, K. Noi, M. Deguchi, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Electrochem. Soc. 雑誌   166 ( 3 )   A5470 - A5473   2019.01

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    Kind of work:Joint Work  

  • Characterization of composite quasi-solid electrolytes composed of 75Li<sub>2</sub>S・25P<sub>2</sub>S<sub>5</sub> glass and phosphate esters

    島本圭, 島本圭, 作田敦, 林晃敏, 辰巳砂昌弘

    電池討論会PDF要旨集(CD-ROM)   60th   2019( ISSN:0378-7753

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    © 2020 Elsevier B.V. Mechanical properties and ionic conductivities of solid electrolytes are important factors influencing the performance of all-solid-state batteries. This study investigates composite quasi-solid electrolytes composed of Li2S–P2S5 glass and a phosphate ester, prepared via planetary ball milling, and the relative densities of the powder-compressed pellets, formed using the composite quasi-solid electrolytes. Dense pellets of the Li2S–P2S5 glass electrolyte are obtained via addition of phosphate esters; the relative densities increase from 90.6% to 93.1%, without the ionic conductivities decreasing, upon addition of a small quantity of tris (2, 2, 2-trifluoroethyl) phosphate to the Li3PS4 glass. The addition of small quantities of phosphate esters to sulfide solid electrolytes is effective in improving the formability of these solid electrolytes.

    DOI: 10.1016/j.jpowsour.2020.228826

    J-GLOBAL

  • 全固体における界面形成とキャラクタリゼーション

    林 晃敏, 作田 敦, 辰巳砂 昌弘

    セラミックス   54   250 - 253   2019

  • Quantitative analysis of crystallinity in an argyrodite sulfide-based solid electrolyte synthesized via solution processing Reviewed

    So Yubuchi, Hirofumi Tsukasaki, Atsushi Sakuda, Shigeo Mori, Akitoshi Hayashi, Masahiro Tatsumisago

    RSC Advances   9 ( 25 )   14465 - 14471   2019( ISSN:2046-2069

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    Publishing type:Research paper (scientific journal)  

    © 2019 The Royal Society of Chemistry. Liquid-phase synthesis is a useful technique for preparing argyrodite sulfide-based solid electrolytes, and the synthesis conditions such as heat treatment strongly affect the conductivity. Because the understanding of structural changes reveals crucial information about their properties, it is necessary to evaluate this change during heat treatment to determine the factors that affect the conductivity. In this study, X-ray diffraction measurements and transmission electron microscope observations reveal the effects of heat treatment on the crystallinities and ionic conductivities in the synthesis process of argyrodite electrolytes with tetrahydrofuran and ethanol. The amorphous material is in the main phase when heated at low temperatures below 200 °C and exhibits relatively low conductivities of ca. 2 × 10-4 S cm-1 despite precipitation of the argyrodite crystals. As the heat treatment temperature increases, the ratio of argyrodite crystals increases, involving nucleation and grain growth, leading to high conductivities of over 10-3 S cm-1. It is critical to control the ratio of the amorphous and crystal phases to achieve high conductivities in the synthesis of argyrodite electrolytes via liquid-phase processing.

    DOI: 10.1039/c9ra00949c

  • Amorphization of Sodium Cobalt Oxide Active Materials for High-Capacity All-Solid-State Sodium Batteries Reviewed

    Y. Nagata, K. Nagao, M. Deguchi, A. Sakuda, A. Hayashi, H. Tsukasaki, S. Mori and M. Tatsumisago

    Chem. Mater. 雑誌   30 ( 20 )   6998 - 7004   2018.11

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    Kind of work:Joint Work  

  • Analysis of the Discharge/Charge Mechanism in VS4 Positive Electrode Material Reviewed

    K. Koganei, A. Sakuda, T. Takeuchi, H. Sakaebe, H. Kobayashi, H. Kageyama, T. Kawaguchi, H. Kiuchi, K. Nakanishi, M Yoshimura T. Ohta, T. Fukunaga, E. Matsubara

    Solid State Ionics 雑誌   323   32 - 36   2018.10

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  • A Reversible Rocksalt to Amorphous Phase Transition Involving Anion Redox Reviewed

    A. Sakuda, K. Ohara, T. Kawaguchi, K. Fukuda, K. Nakanishi, H. Arai, Y. Uchimoto, T. Ohta, E. Matsubara, Z. Ogumi, K. Kuratani, H. Kobayashi, M. Shikano, T. Takeuchi and H. Sakaebe

    Sci. Rep. 雑誌   8 ( 1 )   1 - 6   2018.10

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    Kind of work:Joint Work  

  • Slurry Mixing for Fabricating Silicon-Composite Electrodes in All-Solid-State Batteries with High Areal Capacity and Cycling Stability Reviewed

    M. Yamamoto, Y. Terauchi, A. Sakuda and M. Takahashi

    J. Power Sources 雑誌   402   506 - 512   2018.10

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    Kind of work:Joint Work  

  • Lithium Dissolution/Deposition Behavior with Li3PS4-LiI Electrolyte for All-Solid-State Batteries Operating at High Temperatures Reviewed

    M. Suyama, A. Kato, A. Sakuda, A. Hayashi and M. Tatsumisago

    Electrochim. Acta 雑誌   286   158 - 162   2018.10

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    Kind of work:Joint Work  

  • Optical Microscopic Observation of Graphite Composite Negative Electrodes in All-Solid-State Lithium Batteries Reviewed

    M. Otoyama, A. Sakuda, A. Hayashi and M. Tatsumisago

    Solid State Ionics 雑誌   323   123 - 129   2018.10

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    Kind of work:Joint Work  

  • Favorable Composite Electrodes for All-Solid-State Batteries Reviewed

    A. Sakuda

    J. Ceram. Soc. Jpn. 雑誌   126 ( 9 )   675 - 683   2018.09

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    Kind of work:Single Work  

  • Mechanical Properties of Sulfide Glasses in All-Solid-State Batteries Reviewed

    A. Kato, M. Nose, M. Yamamoto, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Ceram. Soc. Jpn. 雑誌   126 ( 9 )   719 - 727   2018.09

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    Kind of work:Joint Work  

  • Mechanochemical Synthesis and Characterization of Metastable Hexagonal Li4SnS4 Solid Electrolyte Reviewed

    K. Kanazawa, S. Yubuchi, C. Hotehama, M. Otoyama, S. Shimono, H. Ishibashi, Y. Kubota, A. Sakuda, A. Hayashi and M. Tatsumisago

    Inorg. Chem. 雑誌   57 ( 16 )   9925 - 9930   2018.08

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    Kind of work:Joint Work  

  • Structure Analyses of Fe-substituted Li2S-based Positive Electrode Materials for Li-S Batteries Reviewed

    T. Takeuchi, H. Kageyama, N. Taguchi, K. Nakanishi, T. Kawaguchi, K. Ohara, K. Fukuda, A. Sakuda, T. Ohta, T. Fukunaga, H. Sakaebe, H. Kobayashi and E. Matsubara

    Solid State Ionics 雑誌   320   387 - 391   2018.07

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    Kind of work:Joint Work  

  • High-Temperature Performance of All-Solid-State Lithium-Metal Batteries Having Li/Li3PS4 Interfaces Modified with Au Thin Films Reviewed

    A. Kato, M. Suyama, C. Hotehama, H. Kowada, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Electrochem. Soc. 雑誌   165 ( 9 )   A1950 - A1954   2018.06

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    Kind of work:Joint Work  

  • Electrochemical Properties of All-Solid-State Lithium Batteries with Amorphous FeSx-based Composite Positive Electrodes Prepared via Mechanochemistry Reviewed

    M. Pan, T. Hakari, A. Sakuda, A. Hayashi, Y. Suginaka, S. Mori and M. Tatsumisago

    Electrochemistry 雑誌   86 ( 4 )   175 - 178   2018.06

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    Kind of work:Joint Work  

  • Mechanochemically Prepared Li2S-P2S5-LiBH4 Solid Electrolytes with an Argyrodite Structure Reviewed

    A. Sakuda, A. Yamauchi, S. Yubuchi, N. Kitamura, Y. Idemoto, A. Hayashi and M. Tatsumisago

    ACS Omega 雑誌   3 ( 5 )   5453 - 5458   2018.05

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    Kind of work:Joint Work  

  • Preparation of an Amorphous 80LiCoO2・20Li2SO4 Thin Film Electrode by Pulsed Laser Deposition Reviewed

    M. Nishimura, K. Nagao, Y. Ito, M. Deguchi, A. Sakuda, A. Hayashi and M. Tatsumisago

    Electrochemistry 雑誌   86 ( 5 )   246 - 249   2018.05

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    Kind of work:Joint Work  

  • Oxide-Based Composite Electrolytes Using Na3Zr2Si2PO12/Na3PS4 Interfacial Ion Transfer Reviewed

    K. Noi, Y. Nagata, T. Hakari, K. Suzuki, S. Yubuchi, Y. Ito, A. Sakuda, A. Hayashi and M. Tatsumisago

    ACS Appl. Mater. Interfaces 雑誌   10 ( 23 )   19605 - 19614   2018.05

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    Kind of work:Joint Work  

  • Mechanical Properties of Li2S-P2S5 Glasses with Lithium Halides and Application in All-Solid-State Batteries Reviewed

    A. Kato, M. Yamamoto, A. Sakuda, A. Hayashi and M. Tatsumisago

    ACS Appl. Energy Mater. 雑誌   1   1002 - 1007   2018.04

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    Kind of work:Joint Work  

  • Amorphous LiCoO2-based Positive Electrode Active Materials with Good Formability for All-Solid-State Rechargeable Batteris Reviewed

    K. Nagao, Y. Nagata, A. Sakuda, A. Hayashi and M. Tatsumisago

    MRS Advances 雑誌   3 ( 23 )   1319 - 1327   2018.03

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    Kind of work:Joint Work  

  • Structure Analyses of Fe-substituted Li2S-based Positive Electrode Materials for Li-S Batteries Reviewed

    T. Takeuchi, H. Kageyama, N. Taguchi, K. Nakanishi, T. Kawaguchi, K. Ohara, K. Fukuda, A. Sakuda, T. Ohta, T. Fukunaga, H. Sakaebe, H. Kobayashi and E. Matsubara

    Solid State Ionics 雑誌   320   387 - 391   2018.03

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    Kind of work:Joint Work  

  • Preparation of Na3PS4 Electrolyte by Liquid-phase Process Using Ether Reviewed

    M. Uematsu, S. Yubuchi, K. Noi, A. Sakuda, A. Hayashi and M. Tatsumisago

    Solid State Ionics 雑誌   320   33 - 37   2018.02

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    Kind of work:Joint Work  

  • Binder-free Sheet-type All-Solid-State Batteries with Enhanced Rate Capabilities and High Energy Densities Reviewed

    M. Yamamoto, Y. Terauchi, A. Sakuda and M. Takahashi

    Scientific Reports 雑誌   8 ( 1212 )   1 - 10   2018.01

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    Kind of work:Joint Work  

  • Preparation of Sodium Ion Conductive Na10GeP2S12 Glass-Ceramic Electrolytes Reviewed

    F. Tsuji, N. Tanibata, A. Sakuda, A. Hayashi and M. Tatsumisago

    Chem. Lett. 雑誌   2018 ( 47 )   13 - 15   2018.01

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    Kind of work:Joint Work  

  • Electronic and Ionic Conductivities of LiNi1/3Mn1/3Co1/3O2-Li3PS4 Positive Composite Electrodes for All-Solid-State Lithium Batteries Reviewed

    T. Asano, S. Yubuchi, A. Sakuda, A. Hayashi and M. Tatsumisago

    J. Electrochem Soc. 雑誌   164 ( 14 )   A3960 - A3963   2017.12

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    Kind of work:Joint Work  

  • Recent Progress on Interface Formation in All-Solid-State Batteries Reviewed

    A. Sakuda, A. Hayashi and M. Tatsumisago

    Curr. Opin. Electrochem. 雑誌   6   108 - 114   2017.12

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    Kind of work:Joint Work  

  • All-Solid-State Battery Electrode Sheets Prepared by a Slurry Coating Process Reviewed

    A. Sakuda, K. Kuratani, M. Yamamoto, M. Takahashi, T. Takeuchi and H. Kobayashi

    J. Electrochem Soc. 雑誌   164 ( 12 )   A2474 - A2478   2017.12

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    Kind of work:Joint Work  

  • Cubic Rocksalt Li2SnS3 and a Solid Solution with Li3NbS4 Prepared by Mechanochemical Synthesis Reviewed

    A. Sakuda, K. Kuratani, T. Takeuchi, H. Kiuchi, T. Kawaguchi, M. Shikano, H. Sakaebe and H. Kobayashi

    Electrochemistry 雑誌   85 ( 9 )   580 - 584   2017.09

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    Kind of work:Joint Work  

  • Amorphous Metal Polysulfides: Electrode Materials with Unique Insertion / Extraction Reactions Reviewed

    A. Sakuda, K. Ohara, K. Fukuda, K. Nakanishi, T. Kawaguchi, H. Arai, Y. Uchimoto, T. Ohta, E. Matsubara, Z. Ogumi, T. Okumura, H. Kobayashi, H. Kageyama, M. Shikano, H. Sakaebe and T. Takeuchi

    J. Am. Chem. Soc. 雑誌   139   8796 - 8799   2017.07

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    Kind of work:Joint Work  

  • Electrical and Mechanical Properties of Glass and Glass-Ceramic Electrolytes in the System Li3BO3-Li2SO4 Reviewed

    M. Tatsumisago, R. Takano, M. Nose, K. Nagao, A. Kato, A. Sakuda, K. Tadanaga and A. Hayashi

    J. Ceram. Soc. Jpn. 雑誌   125 ( 6 )   433 - 437   2017.06

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    Kind of work:Joint Work  

  • Fabrication of Composite Positive Electrode Sheet with High Active Material Content and Effect of Fabrication Pressure for All-Solid-State Battery Reviewed

    M. Yamamoto, M. Takahashi, Y. Terauchi, Y. Kobayashi, S. Ikeda and A. Sakuda

    J. Ceram. Soc. Jpn. 雑誌   125 ( 5 )   391 - 395   2017.05

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    Kind of work:Joint Work  

  • Preparation and Characterization of Glass Solid Electrolytes in the Pseudoternary System Li3BO3-Li2SO4-Li2CO3 Reviewed

    K. Nagao, M. Nose, A. Kato, A. Sakuda, A. Hayashi and M. Tatsumisago

    Solid State Ionics 雑誌   308   68 - 76   2017.05

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    Kind of work:Joint Work  

  • Development of Li2TiS3-Li3NbS4 by a Mechanochemical Process Reviewed

    A. Sakuda, T. Takeuchi, M. Shikano, K. Ohara, K. Fukuda, Y. Uchimoto, Z. Ogumi, H. Kobayashi and H. Sakaebe

    J. Ceram. Soc. Jpn. 雑誌   125 ( 4 )   268 - 271   2017.04

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    Kind of work:Joint Work  

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Books and Other Publications

  • セラミックス・金属の焼成、焼結技術とプロセス開発

    作田 敦, 本橋宏大, 林 晃敏( Role: Joint author ,  硫化物系固体電解質の常温加圧焼結と電極複合体の作製プロセス)

    技術情報協会  2024.02 

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    Responsible for pages:353-357  

  • EV用電池の安全性向上、高容量化と劣化抑制技術

    作田 敦, 本橋宏大, 林 晃敏( Role: Joint author ,  硫化物型固体電解質を用いた全固体電池の開発動向)

    技術情報協会  2023.12 

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    Responsible for pages:85-91  

  • ニューガラス大学院 基礎課程テキスト

    作田 敦( Role: Sole author ,  ガラスの電気的性質(基礎3))

    ニューガラスフォーラム  2023.10 

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    Responsible for pages:6-1~6-19  

  • 車載用リチウムイオン電池の開発と市場2024

    作田 敦, 本橋宏大, 林 晃敏( Role: Joint author ,  第5章 車載用全固体電池開発の最先端)

    シーエムシー出版  2023.09 

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    Responsible for pages:45-52  

  • ポストリチウムイオン二次電池開発 -部材開発から解析・性能診断技術まで-

    作田 敦, 本橋 宏大, 辰巳砂昌弘, 林 晃敏( Role: Joint author ,  硫黄系正極を用いた全固体二次電池)

    エヌー・ティー・エス  2023.07 

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    Responsible for pages:269-280  

  • 次世代二次電池の開発動向

    林 晃敏, 作田 敦, 本橋宏大, 辰巳砂昌弘( Role: Joint author ,  全固体電池)

    シーエムシー出版  2023.04 

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    Responsible for pages:13-22  

  • モビリティ用電池の化学 -リチウムイオン二次電池から燃料電池まで- (CSJ Current Review 44 Chemistry of Batteries for Mobilities)

    林 晃敏, 作田 敦, 辰巳砂昌弘( Role: Joint author ,  全固体電池)

    化学同人  2022.03 

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    Responsible for pages:50-56  

  • Next Generation Batteries – Realization of High Energy Density Rechargeable Batteries-

    A. Sakuda( Role: Joint author)

    Springer Nature Singapore  2021.12 

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    Responsible for pages:119-123  

  • Next Generation Batteries – Realization of High Energy Density Rechargeable Batteries-

    M. Tatsumisago and A. Sakuda( Role: Joint author ,  Solution Process)

    Springer Nature Singapore  2021.12 

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    Responsible for pages:77-83  

  • 車載用リチウムイオン電池の開発最前線

    林 晃敏・作田 敦・辰巳砂昌弘( Role: Joint author)

    シーエムシー出版  2020.11 

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    Responsible for pages:188-194  

  • Encyclopedia of Materials: Technical Ceramics and Glasses

    K. Ohara, A. Sakuda, A. Hayashi( Role: Joint author)

    Elsevier   2020.06 

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    Responsible for pages:1-11  

  • 全固体リチウム電池の開発動向と応用展望

    作田 敦( Role: Joint author)

    シーエムシー出版  2019.06 

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    Responsible for pages:137-144  

  • リチウムイオン電池&全固体電池製造技術 -微粒子&スラリー調整および評価を中心に-

    加藤敦隆・作田 敦・林 晃敏・辰巳砂昌弘( Role: Joint author)

    シーエムシー・リサーチ  2019.06 

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    Responsible for pages:235-244  

  • 最近の化学工学67 進化する燃料電池・二次電池 -反応・構造・製造技術の基礎と未来社会を支える電池技術-

    林 晃敏・作田 敦・辰巳砂昌弘( Role: Joint author)

    化学工学会  2019.02 

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    Responsible for pages:193-206  

  • 全固体電池開発の現状と産業化へのアプローチ ~製造プロセス、部材作成、高容量化、評価手法~

    辰巳砂昌弘・作田 敦・林 晃敏( Role: Joint author)

    情報機構  2018.11 

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    Responsible for pages:72-83  

  • 全固体電池の基礎理論と開発最前線

    林 晃敏・作田 敦・辰巳砂昌弘( Role: Joint author)

    シーエムシー・リサーチ  2018.07 

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    Responsible for pages:57-71  

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MISC

  • Expectations for Ion-conducting Glasses and the Future

    大幸裕介, 作田敦, 本間剛, 林晃敏

    セラミックス   57 ( 3 )   137 - 140   2022( ISSN:0009-031X

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  • All-Solid-State Battery

    林晃敏, 作田敦, 辰巳砂昌弘

    CSJ Current Review   ( 44 )   2022

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  • 遷移金属硫化物ガラス正極材料の充放電メカニズム

    作田敦

    日本放射光学会年会・放射光科学合同シンポジウム(Web)   35th   2022

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  • Examination of feeding technique of silage mixing feed rice and tofu cake in pigs.

    鈴木菜月, 吉岡圭輔, 前田育子, 佐々木将武, 戸田尚美, 作田敦

    茨城県畜産センター研究報告   ( 51 )   2020( ISSN:1346-6488

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  • 究極に安全な電池への挑戦 期待広がる全固体リチウムイオン二次電池の実用化

    小林弘典, 倉谷健太郎, 奥村豊旗, 作田敦

    産総研LINK(Web)   ( 22 )   2019( ISSN:2189-6097

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Industrial Property Rights

  • 電極活物質粒子の被覆方法及び被覆電極活物質粒子の製造方法

    作田 敦、中村 渉、辰巳砂 昌弘、林 晃敏

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    property_type:Patent 

    Application no:特願2022-177709 

  • 固体電解質前駆液、固体電解質前駆液の製造方法、固体電解質の製造方法 及び固体電解質層を有する基体の製造方法

    作田 敦、中村 渉、辰巳砂 昌弘、林 晃敏

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    property_type:Patent 

    Application no:特願2022-177709 

  • 負極構成部材、負極複合体及びこれらを含む全固体電池

    北浦 弘和、作田 敦、林 晃敏、辰巳砂 昌弘

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    property_type:Patent 

    Application no:特願2022-003858 

  • 電極触媒複合体、電極及びこれらの製造方法

    作田 敦, 長谷川 優樹, 林 晃敏

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    property_type:Patent 

    Application no:特願2021-032789 

    Announcement no:特開2022-133863 

    J-GLOBAL

  • アルカリ金属電池用の電極活物質、それを含む電極及びアルカリ金属電池

    作田 敦、辰巳砂 昌弘、林 晃敏

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    property_type:Patent 

    Patent/Registration no:PCT/JP2020/38342 

  • 全固体ナトリウム電池用の固体電解質とその製造方法及び全固体ナトリウム電池

    林 晃敏, 辰巳砂 昌弘, 作田 敦

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    property_type:Patent 

    Application no:JP2019028881 

    Publication no:WO2020-022342 

    J-GLOBAL

  • 固体電解質組成物、それを用いた成形体、及び全固体二次電池

    島本 圭, 辰巳砂 昌弘, 林 晃敏, 作田 敦

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    property_type:Patent 

    Application no:特願2019-065062 

    Announcement no:特開2020-166994 

    J-GLOBAL

  • 全固体ナトリウム電池用の固体電解質及び全固体ナトリウム電池

    林 晃敏、辰巳砂 昌弘、作田 敦

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    property_type:Patent 

    Patent/Registration no:特願2019-552777、US 16/762752 

  • 全固体ナトリウム電池用の固体電解質及び全固体ナトリウム電池

    林 晃敏, 辰巳砂 昌弘, 作田 敦

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    property_type:Patent 

    Application no:JP2018041013 

    Publication no:WO2019-093273 

    J-GLOBAL

  • 全固体ナトリウム電池用の固体電解質とその製造方法及び全固体ナトリウム電池

    林 晃敏、辰巳砂 昌弘、作田 敦

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    property_type:Patent 

    Patent/Registration no:PCT/JP2019/ 028881 

  • 低結晶性バナジウム硫化物

    小金井 寿人, 作田 敦, 竹内 友成, 栄部 比夏里, 小林 弘典

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    property_type:Patent 

    Application no:JP2018013204 

    Publication no:WO2018-181698 

    Patent/Registration no:特許第6867713号 

    J-GLOBAL

  • 全固体ナトリウム電池用固体電解質及び全固体ナトリウム電池

    林 晃敏, 辰巳砂 昌弘, 作田 敦

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    property_type:Patent 

    Patent/Registration no:PCT/JP2018/ 041013 

  • リチウムスズ硫化物

    作田 敦, 竹内 友成, 倉谷 健太郎, 栄部 比夏里, 鹿野 昌弘, 小林 弘典

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    property_type:Patent 

    Application no:特願2017-071979 

    Announcement no:特開2018-172244 

    Patent/Registration no:特許第6721912号 

    J-GLOBAL

  • リチウムスズ硫化物

    作田 敦, 倉谷 健太郎, 小林 弘典, 竹内 友成

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    property_type:Patent 

    Application no:特願2017-001810 

    Announcement no:特開2018-111616 

    Patent/Registration no:特許第6950916号 

    J-GLOBAL

  • リチウム-鉄-リン-硫黄-炭素複合体及びその製造方法

    竹内 友成, 蔭山 博之, 作田 敦, 栄部 比夏里

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    property_type:Patent 

    Application no:特願2016-560265 

    Patent/Registration no:特許第6501272号 

    J-GLOBAL

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Collaborative research (seeds) keywords

  • 全固体電池

Outline of collaborative research (seeds)

  • 全固体電池

Grant-in-Aid for Scientific Research

  • ナトリウム二次電池用金属硫化物系電極活物質の開拓

    Grant-in-Aid for Scientific Research(C)  2022.04

  • ホロコーン照射を用いた蓄電固体材料のヘテロ/ホモ界面状態の2次元/3次元構造解析

    Grant-in-Aid for Scientific Research(A)  2022.04

  • 全固体イオニクスデバイスにおける電極複合体ダイナミクスの研究基盤確立

    Grant-in-Aid for Scientific Research(S)  2022.04

  • ナトリウム二次電池用金属硫化物系電極活物質の開拓

    2021

  • ナトリウム二次電池用金属硫化物系電極活物質の開拓

    2020

  • ナトリウム二次電池用金属硫化物系電極活物質の開拓

    2020

  • 非晶質を介する新奇充放電機構を有するナトリウム二次電池用金属硫化物材料の創製

    2019

  • 非晶質を介する新奇充放電機構を有するナトリウム二次電池用金属硫化物材料の創製

    2018

  • 非晶質を介する新奇充放電機構を有するナトリウム二次電池用金属硫化物材料の創製

    2017

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Charge of on-campus class subject

  • 無機材料化学

    2022   Weekly class   Undergraduate

  • 物理化学演習IIA

    2022   Weekly class   Undergraduate

  • 応用化学実験I

    2022   Weekly class   Undergraduate

  • 応用化学実験III

    2022   Weekly class   Undergraduate

  • 初年次ゼミナール

    2022   Weekly class   Undergraduate

  • 物質化学生命系特別演習

    2022   Intensive lecture   Graduate school

  • 物質化学生命系特別演習第1

    2022   Intensive lecture   Graduate school

  • 物質化学生命系特別研究 (応用化学分野)

    2022   Intensive lecture   Graduate school

  • 物質化学生命系特別演習第2 (応用化学分野)

    2022   Intensive lecture   Graduate school

  • 応用化学特論3 (応用化学分野)

    2022   Weekly class   Graduate school

  • 無機材料化学特論 (応用化学分野)

    2022   Weekly class   Graduate school

  • 応用化学実験II

    2022   Weekly class   Undergraduate

  • 応用化学実験IV

    2022   Weekly class   Undergraduate

  • 応用化学実験V

    2022   Weekly class   Undergraduate

  • Advanced Applied Chemistry III

    2021    

  • Laboratory Exercises for Applied Chemistry II

    2021   Practical Training  

  • Laboratory Exercises for Applied Chemistry I

    2021   Practical Training  

  • Laboratory Exercises for Applied Chemistry V

    2021   Practical Training  

  • Laboratory Exercises for Applied Chemistry III

    2021   Practical Training  

  • Inorganic Materials Chemistry

    2021    

  • Exercises in Physical Chemistry IIA

    2021    

  • Laboratory Exercises for Applied Chemistry IV

    2021   Practical Training  

  • Advanced Inorganic Materials Chemistry

    2021    

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Charge of off-campus class subject

  • 応用化学の最前線

    2023.01
    Institution:Tokyo Institute of Technology

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    Level:Postgraduate 

Media Coverage

  • 積極投資が重要 コストが課題開発途上 全固体電池 普及の鍵(週刊金曜経済 なぞ解きけいざい) Newspaper, magazine

    毎日新聞  23面  2023.10

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    SDGs:

  • 安全で長寿命、開発進む「全固体電池」 Promotional material

    関西電力㈱YOU'S(ユーズ)  May 2023, No.7, p.16  2023.05

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    SDGs:

  • Domestic Training Programs Reports, Visiting the Hayashi Group at Osaka Metropolitan University Promotional material

    Interface IONICS Newsletter  2023.03

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    SDGs:

  • 全固体がEV普及の鍵を握る(人気講師に聞く!)<日経XTECHラーニングINTERVIEW) Promotional material

    日経ものづくり(NIKKEI MONOZUKURI)  January 2023, p.103-105  2023.01

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    SDGs:

  • 全固体ナトリウム電池の新たな正極材料を開発<トピックス> Newspaper, magazine

    セラミックス  No.57, No.12, p.829  2022.12

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    SDGs:

  • 全固体ナトリウム電池の新たな正極材料を開発~二次電池市場を支えるより安価で高性能な全固体電池の実現へ~

    プレスリリース  2022.09

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    SDGs:

  • 高温X高容量を実現!全固体電池開発の技術を応用し成形性に優れた固体電解質を用いた蓄電デバイスの実現に成功!

    プレスリリース  2022.07

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    SDGs:

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