文献类型：期刊文献

英文题名：Multi-failure mode characterization and low-cycle fatigue assessment of Si C core-shell particles in the lithium-ion battery

作者：Ding, Haoyu[1];Wang, Xiaoxiao[1];Chen, Haofeng[1,2,3];Luan, Weiling[1];Tu, Shan-Tung[1,2,3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Wuhan Inst Technol, Sch Mech & Elect Engn, Hubei Prov Key Lab Chem Equipment Intensificat & I, Wuhan 430205, Peoples R China

年份：2025

卷号：198

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20251718288337);WOS:【SCI-EXPANDED(收录号:WOS:001480507200001)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (52375145 and 52375144) , the Shanghai Gaofeng Project for University Academic Program Develop-ment, the China Postdoctoral Science Foundation (2023TQ0119, GZC20240467 and 2024M760909) and the Shanghai Pujiang Program (No. 24PJD026) .

语种：英文

外文关键词：Core-shell structure; Si C anode material; Low-cycle fatigue; Lithium-ion battery

摘要：Si C composites are considered potential anode materials due to better cycling stability, compared to pure silicon. However, severe volume expansion of Si during cycling results in various failure forms of Si C particles, exposing the Si core to the electrolyte, generating Solid-Electrolyte Interface (SEI) films, and consuming lithium-ions in the electrolyte solution. In this paper, a coupled mechanical-chemical model is developed to analyze different failure modes of the particle during the charge and discharge cycle. Besides, the Direct Steady Cyclic Analysis (DSCA) under the Linear Matching Method (LMM) framework is utilized to evaluate the fatigue damage at the critical location of the particle. With the C shell thickness increased, the particle is more prone to debonding failure between the Si core and C shell, while a thicker C shell can mitigate the volume expansion of the Si core and alleviate fatigue damage in the C shell. This study also establishes a threshold size to identify the significant acceleration of low-cycle fatigue damage, which provides theoretical guidance for particle design.