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

作     者：HE YaoLong XU Peng JIANG DengFeng HU HongJiu LI DaWei SHI SiQi 

作者机构：Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai University Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai University Shanghai Frontier Science Center of MechanoinformaticsShanghai University School of Mechanical EngineeringUniversity of Shanghai for Science and Technology School of Materials Science and EngineeringShanghai University Materials Genome InstituteShanghai University 

出 版 物：《Science China Technological Sciences》 (中国科学:技术科学(英文版))

年 卷 期：2024年第67卷第10期

页      面：3168-3181页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the Natural Science Foundation of Shanghai(Grant No. 23ZR1421800) the National Natural Science Foundation of China (Grant Nos. 12272213 and 11872235) 

主　　题：solid electrolyte interphase capacity fading multiscale mechanical-electrochemical coupling stress analysis 

摘      要：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.