阳极
淡出
材料科学
电化学
降级(电信)
锂(药物)
锂离子电池
粒子(生态学)
芯(光纤)
壳体(结构)
电池(电)
离子
电极
化学工程
复合材料
化学
电气工程
计算机科学
热力学
物理
工程类
内分泌学
地质学
物理化学
功率(物理)
有机化学
操作系统
海洋学
医学
出处
期刊:Journal of electrochemical energy conversion and storage
[ASME International]
日期:2020-11-05
卷期号:18 (2)
被引量:8
摘要
Abstract The capacity fade in lithium-ion battery (LIB) of high energy density using Si/C core–shell particle anode is one of the major barriers blocking its wide application. However, the underlying mechanism of electro-chemo-mechanical degradation remains unclear. In this study, we propose and validate a multiscale model (electrode level and particle level), considering electrochemical–mechanical coupling and cohesive zone method at the particle level. The effects of charging rate, core/shell ratio, and mechanical properties of the shell on the separation and capacity fade are discussed. We discover that larger charging rate, smaller core/shell ratio, and stiffer shell can mitigate the core–shell separation gap, leading to higher capacity retention. Results shed light on the degradation mechanism of Si/C core–shell anode and provide design guidance for Si/C anode materials in minimizing the capacity fade and safe battery charging/discharging strategy.
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