Analysis of diffusion induced elastoplastic bending of bilayer lithium-ion battery electrodes

查看全文 作　　者：Dawei [1]LI;Zongzan [1]LI;Yicheng [2,3]SONG;Junqian [2,3]ZHANG 机构地区：[1]Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China;[2]Department of Mechanics,College of Sciences,Shanghai University,Shanghai 200444,China;[3]Shanghai Key Laboratory of Mechanics in Energy Engineering,Shanghai 200072,China 出　　处：《Applied Mathematics and Mechanics(English Edition)》索引2016年第37卷第5期,共12页 基　　金：Project supported by the National Natural Science Foundation of China(Nos.11332005 and 11172159);the Innovation Program of Shanghai Municipal Education Commission(No.13ZZ070) 摘　　要：Bilayer electrode, composed of a current collector layer and an active material layer, has great potential in applications of in-situ electrochemical experiments due to the bending upon lithiation. This paper establishes an elastoplastic theory for the lithiation induced deformation of bilayer electrode with consideration of the plastic yield of current collector. It is found that the plastic yield of current collector reduces the restriction of current collector to an active layer, and therefore, enhances in-plane stretching while lowers down the rate of electrode bending. Key parameters that influence the elastoplastic deformation are identified. It is found that the smaller thickness ratio and lower elastic modulus ratio of current collector to an active layer would lead to an earlier plastic yield of the current collector, the larger in-plane strain, and the smaller bending curvature, due to balance between the current collector and the active layer. The smaller yield stress and plastic modulus of current collector have similar impacts on the electrode deformation. 关 键 词：弹塑性理论 弯曲分析 电池电极 锂离子 弹塑性变形 塑性屈服 扩散 双层电极