Finite Element Analysis of the Lithium Diffusion in the Silicon Copper Nano-pillar

When the Li+ current diffuses into the anode, its volume varies greatly, the volume of the anode can increase to 300%, resulting in a significant change in the mechanical properties of the anode. Currently, there are many structures proposed as anode for lithium-ion batteries with Si materials, for example: thin plate structure, nano-particles, nanofibers, copper nano-pillar…. We attend specially to the silicon copper nano-pillar because this structure can create a generation of batteries with fast charging capacity and large capacity. In this study, we use simulation method to find the relationship between mechanical properties (displacement, deformation, stress…) and Li+ diffusion currents during charging. That will help manufacturers to choose the optimal and reasonable structure when making batteries.