| Project/Area Number |
22K04739
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 26040:Structural materials and functional materials-related
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| Research Institution | Kyushu University |
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Principal Investigator |
WATANABE KEN 九州大学, 総合理工学研究院, 准教授 (90552480)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Completed (Fiscal Year 2024)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2024: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 一括焼結型全固体電池 / Liインサーション / 劣化挙動 / ガーネット / 層状岩塩 / 機械劣化 / 全固体電池 / Liイオン伝導体 / 層状岩塩構造 / ガーネット型酸化物 / 一括焼結 |
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| Outline of Research at the Start |
申請者は、これまでにガーネット型酸化物（Li7La3Zr2O12:LLZ）を固体電解質、Ni系層状岩塩酸化物を正極活物質とした一括焼結型全固体Liイオン二次電池（Co-fired all solid-state Li-ion battery: Cf-AssLiB）の作製プロセスを確立した。本研究では、Cf-AssLiBにしか実現できない活物質緻密正極や活物質緻密層と活物質/固体電解質複合層を積層した二層正極など正極微細構造や活物質組成が電池特性に与える影響を調査し、Cf-AssLiBの高性能化に資する設計指針を得ることを目的とする。
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| Outline of Final Research Achievements |
In all-solid-state sintered batteries, battery characteristics are considered controllable based on the mixing state of cathode active material and LLZ within the composite cathode, microstructure, and mixed conductivity of the cathode active material. In particular, since sintering is used, various electrode structures can be applied, such as dense electrodes formed by densifying only the cathode active material, or layered structures consisting of LLZ/cathode active material mixed electrodes and dense layers.
Therefore, this study focuses on designing electrode structures unique to all-solid-state sintered batteries. It has been observed that using only a dense layer of active material as the electrode leads to cycle degradation. However, it was found that cycle degradation could be suppressed by forming a buffer layer consisting of a mixture of solid electrolyte and active material between the solid electrolyte and the dense layer of active material.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、酸化物系固体電解質からなる一括焼結型全固体電池の正極に注目し、その高性能化につながる材料設計指針を、作製条件、正極活物質のLi組成、電極の構造の観点から精査したもので、酸化物系焼結型電池において、活物質の欠陥制御、活物質の体積変化の緩和が電池性能に寄与することを見出したもの、焼結型全固体電池における学術的知見を開拓した。また、得られた成果は、社会実装に向けた課題抽出およびその解決の糸口になり、今後の発展が期待される。
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