2023 Fiscal Year Final Research Report
Electrochemical quartz crystal microbalance measurements of the electrode reactions in lithium secondary batteries
| Project/Area Number |
19K15682
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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 36020:Energy-related chemistry
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | EQCM / リチウムイオン電池 / その場測定 / 電極質量変化 / 局所粘性率 / 共振 / 電極作製 / 合剤電極 |
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| Outline of Final Research Achievements |
The in-situ analysis of the charge-discharge reactions of rechargeable lithium batteries was investigated using an electrochemical quartz crystal microbalance (EQCM) under the simulated conditions of the inside of practical batteries. The prepared composite-coated quartz crystal electrode oscillated in organic electrolytes with a low resonance resistance. The changes in the electrode mass and the local physicochemical properties of the electrolyte in the composite electrode during the reactions were quantitatively analyzed by monitoring the resonance frequency and resistance of the electrode. These changes can be detected in the contact with a separator on the composite electrode, suggesting that EQCM can be applied to analyze the charge-discharge reactions under the simulated conditions of practical batteries.
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| Free Research Field |
電気化学
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| Academic Significance and Societal Importance of the Research Achievements |
電気化学水晶振動子マイクロバランス（EQCM）を用いた平滑電極上での電極反応解析は従来から行われていたが，本研究では二次電池の活物質を含む多孔性の電極を用いて，電解液の局所物性変化から電極内のリチウムイオン濃度分布を解析できた．さらに，この局所物性変化の寄与を考慮することで反応に伴う電極質量変化を定量的に解析できたことはEQCMを用いた新たな反応解析手法の観点で学術的な意義がある．また，実用電池内部と同様にセパレーターが押下された環境でも反応解析できたことは電池開発の観点で社会的波及効果がある．
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