充放电循环下锂离子电池电极的结构变形、分层和锂枝晶生成

项目名称： 充放电循环下锂离子电池电极的结构变形、分层和锂枝晶生成

项目编号： No.11472165

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 郭战胜

作者单位： 上海大学

项目金额： 100万元

中文摘要： 锂离子电池是各类移动式储能和供能器件的主流电源, 也是当前化学、材料、能源、力学等学科交叉研发的重点和热点之一。本项目以电极材料/结构为对象，重点揭示充放电循环下电极结构变形、分层以及锂枝晶生成等导致锂离子电池性能退化的机理，发展电化学反应、材料性能、扩散、应力等因素耦合作用下的理论模型。通过构建实时原位观测系统和电极变形、分层以及锂枝晶生成等的实时原位观测，理解电化学反应、材料性能、扩散、应力场之间的耦合效应和竞争机制。从理论和实验两个层面掌握锂离子电池电极因锂枝晶生成、电极损伤而导致性能退化的演化历程，设计出枝晶少、变形小、无分层的电极结构和充放电规程。研究有重要的科学意义和较大的实际应用价值。

中文关键词： 锂离子电池；充放电循环；变形；分层；锂枝晶

英文摘要： Lithium ion batteries which are most popular powers of all kinds of mobile and energy storage devices are one of the focus and interdisciplinary research hotspot for chemistry, materials, energy, mechanics and so on. The proposal which chooses the electrode material / structure in lithium ion battery will focus on revealing the mechanism of electrode structure deformation, delamination and lithium dendrites generation. These factors will affect the performance degradation of the lithium-ion battery during charge-discharge cycle. The theoretical model which considers the influence of electrochemical reactions, material properties, and diffusion on stress is developed. By building electrode deformation, delamination and lithium dendrites in situ observing system, the coupling effects and mechanism of electrochemical reaction, material properties, diffusion, and the stress field are analysized. The charge-discharge process and electrode design of lithium-ion batteries which are lack of lithium dendrites, deformation, and delamination damage are obtained from theory and experimental verification. The research has important scientific significance and practical value.

英文关键词： Li-ion battery;change-discharge cycle;deformation;delamination;Lithium dendrite