Effects of technology parameters on stress in silicon-graphite based multilayer electrodes for lithium ion batteries
Effects of technology parameters on stress in silicon-graphite based multilayer electrodes for lithium ion batteries
复制标题
工艺参数对锂离子电池硅石墨基多层电极应力的影响
DOI：
10.1088/1361-6463/ab1c4a
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Fang Daining
中科院分区：
文献类型：
--
作者：
Wang Zhuo;Li Caisheng;Shi Jun;Huang Huiyu;Dai Cuiying;Mao Weiguo;Chen Xi;Fang Daining
锂离子电池（LIB）的多层电极中由锂离子的插入产生的应力导致电极的机械劣化和失效，以及电池的电化学性能的劣化。在本文中，复合活性层的有效变形所引起的活性材料在电化学过程中的变形作为荷电状态（SOC）的函数进行预测。推导了多层电极中面内应力的一般解析解，讨论了集流体与复合活性层的厚度比、复合活性层的孔隙率以及硅与石墨的质量比对两层和对称三层硅-石墨（SG）中面内应力的变化和分布的影响的电极进行了评价和讨论。在应力分析的基础上，提出了SG基多层LiB电极的优化设计策略。
Stress in a multilayer electrode for a lithium ion battery (LIB) generated by the insertion of lithium ions results in the mechanical degradation and failure of the electrode, as well as the deterioration of the electrochemical properties of the battery. In this paper, the effective deformation of a composite active layer caused by the distortion of active material in the electrochemical process was predicted as a function of state of charge (SOC). A general analytical solution of in-plane stress in a multilayer electrode for a LIB was derived with respect to the geometry parameters, material properties, and SOC. The effects produced by the thickness ratio of the current collector to the composite active layer, porosity of the composite active layer, and mass ratio of silicon to graphite on the variation and distribution of in-plane stress in both two-layered and symmetric three-layered silicon-graphite (SG) based electrodes were appraised and discussed. Based on the stress analysis, some optimized design strategies for SG based multilayer LIB electrodes are suggested.