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Quantifying the solid electrolyte interphase stress induced capacity fading of lithium-ion batteries via a multiscale mechanical-electrochemical coupling model

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Science China Technological Sciences 2024年第10期67卷 3168-3181页

作者： HE YaoLong XU Peng JIANG DengFeng HU HongJiu LI DaWei SHI SiQi Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Shanghai Frontier Science Center of Mechanoinformatics Shanghai University School of mechanical Engineering University of Shanghai for Science and Technology School of Materials Science and Engineering Shanghai University Materials Genome Institute Shanghai University

The solid electrolyte interphase（SEI） is widely recognized as a critical factor leading to the capacity fading of lithium-ion batteries（LIBs）. Although SEI stress-related mechanical failure caused by the expansion or contraction of active materials upon cycles is well documented, previously reported SEI components and overpotential varying phenomena due to SEI stress and their effects on the electrochemical performance are poorly understood. Here, we establish a quantitative correlation between capacity fading and the SEI stress by considering its effects on side reactions, especially SEI component evolution, in a multiscale mechanical-electrochemical coupling model. Furthermore, the capacity fading behaviors of two typical cells（Li[NiMnCo]O2as the cathode, and graphite and silicon as the anode, respectively） were adopted as numerical examples to demonstrate its potential utility and applications. Stress within the SEI was indeed found to play a predominant role in the capacity fading of the graphite and silicon anodes, resulting in 27% and 69% of the total capacity loss after 200 and 100 cycles at 1 C, respectively. This study provides valuable mechanical insights into the variations of SEI properties related to the capacity degradation and SEI optimization and design for LIBs.

关键词： solid electrolyte interphase capacity fading multiscale mechanical-electrochemical coupling stress analysis

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