| Analysis on diffusion-induced stress for multi-layer spherical core–shell electrodes in Li-ion batteries |
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| 作者单位： | 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 |
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| 基金项目： | 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(MSCS) 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.
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| 收稿时间： | 2021-05-19 |
Analysis on diffusion-induced stress for multi-layer spherical core-shell electrodes in Li-ion batteries |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | multi-layer spherical core-shell electrode diffusion-induced stress |
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