储能科学与技术2025，Vol.14Issue(6)：2240-2247,8.DOI:10.19799/j.cnki.2095-4239.2024.1149
锂电池石墨复合电极力-电耦合性能原位测量分析
In situ measurement and analysis of the electromechanical coupling performance of composite graphite electrodes in lithium batteries
摘要
Abstract
Graphite is currently one of the most widely used anode materials in lithium batteries,and its electrochemical-mechanical coupling performance is crucial for the structural stability and cycling lifespan of lithium batteries.This study employed in situ measurements to investigate the evolution of the electromechanical coupling performance of composite graphite electrodes during electrochemical cycling.A physical model was also developed to analyze the evolution of the curvature,Young's modulus,strain,and partial molar volume of the composite graphite electrodes.The results show that,the elastic modulus of the graphite electrode increases progressively with the progression of lithiation,indicating a hardening behavior,while the partial molar volume undergoes phase changes that correspond to the charge state.Current collectors of different thicknesses significantly affect the stress and strain within the electrode.A thicker current collector provides more pronounced mitigation of the strain in the active layer.The peak stress and strain in the active layer of the electrode reach their maxima during the third electrochemical cycle,and the evolutionary trends of each cycle tend to converge.This work reveals the systematic mechanical-response characteristics and the evolution of the mechanical properties of graphite electrodes during the electrochemical reaction process,providing significant theoretical support for a deeper understanding of the mechanical behavior of lithium-ion battery electrodes.关键词
石墨复合电极/模量/偏摩尔体积/锂离子电池Key words
graphite composite electrode/modulus/partial molar volume/lithium-ion battery分类
动力与电气工程引用本文复制引用
刘佳辉,卞伟翔,李大伟..锂电池石墨复合电极力-电耦合性能原位测量分析[J].储能科学与技术,2025,14(6):2240-2247,8.基金项目
国家自然科学基金资助项目(12102264),上海市科委"启明星培育(扬帆专项)"资助项目(24YF2730300). （12102264）
