2022 Fiscal Year Final Research Report
Development of SOH Diagnosis Method for Secondhand Lithium-Ion Batteries by AC Impedance Technique
| Project/Area Number |
20K14729
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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 21010:Power engineering-related
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| Research Institution | Japan Automobile Research Institute |
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Principal Investigator |
Ando Keisuke 一般財団法人日本自動車研究所, 環境研究部, 研究員 (80866161)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | リチウムイオン電池 / 劣化診断 / 残存容量評価 |
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| Outline of Final Research Achievements |
In this study, the dependence of impedance on state of charge (SOC) was clarified for five electrode materials for lithium-ion batteries (LIBs). Based on the results, we succeeded in developing a new state-of-health (SOH) diagnosis method to calculate the remaining capacity by impedance technique by evaluating the slippage between positive-negative electrodes, which is a degradation phenomenon of LIBs. The effect of Li-ion diffusion in the active material on the impedance was also investigated using a battery performance simulator, and it was clarified that a small diffusion coefficient leads to a large impedance.
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| Free Research Field |
二次電池
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| Academic Significance and Societal Importance of the Research Achievements |
環境問題に対する意識の高まりから，LIBを搭載した電気自動車の普及が進められているが，課題の一つとして車載LIBの劣化による航続距離の低下が挙げられる．車載用LIBはその使用環境・方法が様々であることから，中古車両の残存性能評価には，車載用LIBの性能低下を個々に診断する技術が求められている．本研究では，LIBのインピーダンス特性について電極材料ごとに解析を進め，特に拡散係数がインピーダンスに及ぼす影響を明らかにしたことは学術的な意義は高いと考える．また，電極材料のインピーダンスのSOC依存性を応用した，LIBの劣化メカニズムに基づいた劣化診断術を開発したことは社会的意義も大きいと考える．
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