Diffusion-induced stress of electrode particles with spherically isotropic elastic properties in lithium-ion batteries

详细信息    查看全文

• 作者：Xing-yu Zhang ; Hao-sen Chen ; Dai-ning Fang
• 关键词：Diffusion ; induced stress ; Lithium ; ion battery ; Anisotropy ; Spherical electrode ; Charging strategy
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：20
• 期：10
• 页码：2835-2845
• 全文大小：2,078 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768
• 卷排序：20

文摘

Mechanical degradation generated by crack nucleation and pulverization can lead to the capacity fade in lithium-ion batteries, which has been attributed to diffusion-induced stress inside battery electrodes in recent years. However, not much attention has been directly taken to the models of diffusion-induced stress for anisotropic electrodes. In this work, we develop an analytical model of diffusion-induced stress for spherically isotropic elastic electrodes under potentiostatic and galvanostatic operation. It is shown that the stresses depend strongly on the lithiation expansion coefficient ratio and the elastic modulus ratio of tangential direction to radial direction. The stresses have the different evolution under potentiostatic and galvanostatic control, but have a common feature that they are all affected by the initial condition. From the standpoint of mechanics, our results indicate that extracting more lithium before lithiation (or inserting lower lithium before delithiation) is a good strategy to minimize stress and thus enhance capacity retention for spherically isotropic electrodes.