外载对球形颗粒电极锂化过程的扩散影响OA北大核心CSTPCD

Lithium ion batteries are inevitably subjected to external mechanical loads,which can have a significant impact on the battery.In this paper,a chemomechnical coupled model for the lithiation process of a spherical particle electrode under external mechanical loads is established based on the theories of small deformation and linear elasticity.It is found that the influence of external stress gra-dient on diffusion process gradually increases as the diffusion processes,and the lithium ion concen-tration at the center of the sphere is lower than that at the surface of the sphere at the steady state.The positive stress gradient has an inhibitory effect on diffusion of lithium ion.For complex external loads,the lithium ion concentration shows a nonlinear and non-uniform distribution along the radial direction at the steady state.