Insights for understanding multiscale degradation of LiFePO<sub>4</sub> cathodes

Wang Li; Qiu Jingyi; Wang Xiaodan; Chen Long; Cao Gaoping; Wang Jianlong; Zhang Hao; He Xiangming

doi:10.1016/j.esci.2022.03.006

Volume 2 Issue 2

Mar. 2022

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Wang Li, Qiu Jingyi, Wang Xiaodan, Chen Long, Cao Gaoping, Wang Jianlong, Zhang Hao, He Xiangming. Insights for understanding multiscale degradation of LiFePO4 cathodes[J]. eScience, 2022, 2(2): 125-137. doi: 10.1016/j.esci.2022.03.006

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Wang Li, Qiu Jingyi, Wang Xiaodan, Chen Long, Cao Gaoping, Wang Jianlong, Zhang Hao, He Xiangming. Insights for understanding multiscale degradation of LiFePO₄ cathodes[J]. eScience, 2022, 2(2): 125-137. doi: 10.1016/j.esci.2022.03.006

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Insights for understanding multiscale degradation of LiFePO₄ cathodes

doi: 10.1016/j.esci.2022.03.006

a.
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, 100084, China
b.
Research Institute of Chemical Defense, Beijing, 100191, China

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Corresponding author: Hao Zhang dr.h.zhang@hotmail.com; Xiangming He hexm@tsinghua.edu.cn
Received Date: 2022-01-01
Revised Date: 2022-02-20
Accepted Date: 2022-03-16

Available Online: 2022-03-24

Abstract

Abstract

Lithium-ion batteries (LIBs) based on olivine LiFePO₄ (LFP) offer long cycle/calendar life and good safety, making them one of the dominant batteries in energy storage stations and electric vehicles, especially in China. Yet scientists have a weak understanding of LFP cathode degradation, which restricts the further development of LFP materials and batteries. Here, we critically review reports on LFP cathode degradation with respect to different electric parameters (including C-rates, storage, and long cycling), mechanical stresses, and thermal fields. The detailed chemical and physical aspects of degradation mechanisms at various scales (i.e., from atomic to devices) and their causes are comprehensively summarized, and discussions of related concerns are provided in each section. We close with a systematic overview of LFP degradation research and mediation strategies, suggesting future directions for developing robust, safe LFP batteries with long cycle life.
- Lithium-ion batteries,
- LiFePO₄ cathodes,
- Multiscale degradation,
- Multisource field,
- Safety

● A systematical perspective of LFP degradation and mediation strategies are provided for long life and safe LFP batteries.
● LFP cathode degradation under different electric parameters, mechanical stresses, and thermal fields are critically reviewed.
● Detailed degradation mechanisms from atomic scale to devices are summarized with safety concerns and mechanisms.

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References

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