中国物理B ›› 2021, Vol. 30 ›› Issue (9): 98201-098201.doi: 10.1088/1674-1056/ac11de

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

Siyuan Yang(杨思源)1,2, Chuanwei Li(李传崴)1,2,†, Zhifeng Qi(齐志凤)1,2, Lipan Xin(辛立攀)1,2, Linan Li(李林安)1,2, Shibin Wang(王世斌)1,2, and Zhiyong Wang(王志勇)1,2,‡   

  1. 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
  • 收稿日期:2021-05-19 修回日期:2021-07-02 接受日期:2021-07-07 出版日期:2021-08-19 发布日期:2021-09-02
  • 通讯作者: Chuanwei Li, Zhiyong Wang E-mail:licw16@tju.edu.cn;zywang@tju.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12072229 and 11602167).

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

Siyuan Yang(杨思源)1,2, Chuanwei Li(李传崴)1,2,†, Zhifeng Qi(齐志凤)1,2, Lipan Xin(辛立攀)1,2, Linan Li(李林安)1,2, Shibin Wang(王世斌)1,2, and Zhiyong Wang(王志勇)1,2,‡   

  1. 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
  • Received:2021-05-19 Revised:2021-07-02 Accepted:2021-07-07 Online:2021-08-19 Published:2021-09-02
  • Contact: Chuanwei Li, Zhiyong Wang E-mail:licw16@tju.edu.cn;zywang@tju.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12072229 and 11602167).

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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

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.

Key words: multi-layer spherical core-shell electrode, diffusion-induced stress

中图分类号:  (Lithium-ion batteries)

  • 82.47.Aa
47.11.Bc (Finite difference methods) 82.45.Fk (Electrodes)