Analysis on diffusion-induced stress for multi-layer spherical core-shell electrodes in Li-ion batteries  

作　　者：Siyuan Yang Chuanwei Li Zhifeng Qi Lipan Xin Linan Li Shibin Wang Zhiyong Wang 杨思源;李传崴;齐志凤;辛立攀;李林安;王世斌;王志勇(Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Modern Engineering Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300350,China [2]Tianjin Key Laboratory of Modern Engineering Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300350,China

出　　处：《Chinese Physics B》2021年第9期587-593,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.12072229 and 11602167).

摘　　要：Silicon-based carbon composites are believed as promising anodes in the near future due to their outstanding specific capacity and relatively lower volume effect compared to pure silicon anodes.Herein,a multilayer spherical core-shell(M-SCS)electrode with a graphite framework prepared with Si@O-MCMB/C nanoparticles is developed,which aims to realize chemically/mechanically stability during the lithiation/delithiation process with high specific capacity.An electrochemical-/mechanical-coupling model for the M-SCS structure is established with various chemical/mechanical boundary conditions.The simulation of finite difference method(FDM)has been conducted based on the proposed coupling model,by which the diffusion-induced stress along both the radial and the circumferential directions is determined.Moreover,factors that influence the diffusion-induced stress of the M-SCS structure have been discussed and analyzed in detail.

关 键 词：multi-layer spherical core-shell electrode diffusion-induced stress 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]