Diffusion-induced stresses in graphene-based composite bilayer electrode of lithium-ion battery

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• 作者：Dongying Liu^a ; ^b ; Weiqiu Chen^a ; ^c ; ^d ; ^e ; ^{chenwq@zju.edu.cn} ; Xudong Shen^a
• 关键词：Diffusion-induced stresses ; Graphene-based composite electrode ; Graphene platelets ; Stoney formula
• 刊名：Composite Structures
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：165
• 期：Complete
• 页码：91-98
• 全文大小：1982 K
• 卷排序：165

文摘

The diffusion-induced stresses in a bilayer electrode composed of a current collector and a composite active plate of lithium-ion battery are evaluated analytically. The active plate of the bilayer electrode is reinforced by graphene platelets (GPLs), with the corresponding material properties predicted by the combination of the well-established Halpin-Tsai model and the rule of mixture. The diffusion-induced stresses and curvature of the bilayer electrode under either galvanostatic or potentiostatic charging operation are derived. In addition, modified Stoney formulas for the bilayer electrode are developed for the two charging operations. A parametric study is conducted through numerical examples, with a particular focus on the reinforcing effect of GPLs on the stresses and deformation in the bilayer electrode. The size effects of GPLs, including width, length and thickness, on the stresses and deformation are also discussed.