上海科技大学知识管理系统

The finite element simulation of lithium phosphorus oxynitride(LiPON)-based all-solid-state lithium batteries is performed based on COMSOL Multiphysics which is a Multiphysics simulation platform. Utilizing the interfaces of tertiary current distribution, dilute substance transfer, solid heat transfer and solid mechanics,the coupling of multiple physical fields in the solid-state battery system is realized. At the same time, the electrochemical performance simulation for the all-solid-state lithium battery itself under given physical parameters is also completed. In this model, the thermal management and stress distribution of the battery during operation are effectively calculated. The deposition data on the lithium anode surface was used to analyze the possible causes of lithium dendrite growth. The results showed that the capacity decay of an all-solid lithium batteries and the safety management out of control such as dendrite growth are not just the result of single factor control. The system's concentration gradient, pre-stress distribution of stress, the speed-control step of heat and mass transfer processes and volume change during the charge and discharge process will all have different effects on battery performance and safety management.