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

Chinese Physics B 2021年第9期30卷 587-593页

作者： Siyuan Yang Chuanwei Li Zhifeng Qi Lipan Xin Linan Li Shibin Wang Zhiyong Wang Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Modern Engineering Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China

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 ***,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 *** electrochemical-/mechanical-coupling model for the M-SCS structure is established with various chemical/mechanical boundary *** 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 ***,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

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Study on cracking of welding overlay based on the theory of diffusion-induced stress

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Acta Metallurgica Sinica(English Letters) 2011年第1期24卷 75-80页

作者： Xiliang ZHANG Changyu ZHOU School of Mechanical and Power Engineering Nanjing University of Technology Nanjing 210009 China

Hydrogen diffusion in the wall of hydrogenation reactor for three situations, i.e. operating, normal shutdown and abnormal shutdown, was numerically simulated based on the finite element program-ABAQUS. The formula of diffusion-induced stress was deduced for model of the thin walled cylinder. Distribution of diffusion-induced stress in the wall of hydrogenation reactor was studied. The results showed that the maximum stress was at the fusion surface between welding overlay and base metal and which would increase with cooling rate. The crack will initiate and propagate from fusion surface to welding overlay when the diffusion-induced stress is higher than yield stress, but it will not propagate to the base metal. diffusion-induced stress is one of the important factors for crack initiation and propagation of welding overlay of hydrogenation reactor.

关键词： diffusion-induced stress Hydrogen diffusion Welding overlay Crack initiation ABAQUS

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