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
Abstract 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.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12072229 and 11602167).
Corresponding Authors:
Chuanwei Li, Zhiyong Wang
E-mail: licw16@tju.edu.cn;zywang@tju.edu.cn
Cite this article:
Siyuan Yang(杨思源), Chuanwei Li(李传崴), Zhifeng Qi(齐志凤), Lipan Xin(辛立攀), Linan Li(李林安), Shibin Wang(王世斌), and Zhiyong Wang(王志勇) Analysis on diffusion-induced stress for multi-layer spherical core-shell electrodes in Li-ion batteries 2021 Chin. Phys. B 30 098201
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