Diffusion stress analysis of spherical shell electrode

Abstract

Lithium-ion batteries have a wide range of applications in the field of electronics. It is necessary to conduct in-depth study of the impact of diffusion-induced stress to enhance the performance of lithium-ion batteries. In this study, the diffusion-induced stress of spherical shell electrode is investigated. The effect of initial concentration of lithium ions and the size of electrode on the diffusion stress under constant voltage charge and discharge conditions are analysed by employing single phase diffusion model. In this paper, the evolution of the lithium ion concentration in the spherical shell electrode is calculated by controlling the initial concentration of lithium ions, and then the size of the electrode material is changed to explore the radial and circumferential stress of the spherical shell electrode material. It is found that the lower initial concentration of lithium ions can effectively reduce the diffusion stress. The stress variation of the right peak point of spherical shell electrode with lithium ion concentration is further studied. The results show that the smaller the electrode material size, the smaller the diffusion stress.