2020 Fiscal Year Final Research Report
Control of High Capacity Cathode Reaction of Lithium Secondary Batteries by Construction of Solid Electrolyte/Electrode Interface
| Project/Area Number |
19K15658
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
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| Research Institution | Mie University |
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Principal Investigator |
Taminato Sou 三重大学, 工学研究科, 助教 (60771201)
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Keywords | リチウム二次電池正極材料 / 固体電解質 / 薄膜電池 |
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| Outline of Final Research Achievements |
We investigate the electrochemical performance of Li5FeO4 with solid electrolyte by using thin-film electrode. The charge-discharge characteristics of the Li3PO4 layered thin-film electrode showed improved coulombic efficiency in the first cycle compared to the unstacked electrode. The reversibility of the high-capacity cathode reaction is improved by constructing a solid interface with Li3PO4 solid electrolyte.
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| Free Research Field |
無機固体化学
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| Academic Significance and Societal Importance of the Research Achievements |
Li5FeO4は，初回充電時に従来正極の4倍以上の高容量を示すが，充電時のLi脱離以外に反応性の高い有機電解液との副反応で不可逆な酸素脱離が進行して分解するため，放電時に容量が取り出せない点が課題であった．本検討により，Li3PO4の積層による固体界面の構築で，高容量正極反応の可逆性が向上することを見出した.正極材料の高容量化に向けた材料探索や反応機構の制御指針を得ることに貢献し，リチウム二次電池の高エネルギー密度化に繋がると考えられる．
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