Spatial-Dependent Coupling of Electrochemistry, Mass Transport, and Stress in Silicon-Graphite Composite Electrodes for Lithium-Ion Batteries

This study focuses on electrochemical, mass transport and stress coupling mechanisms by considering different spatial configurations of silicon and graphite. In situ electrochemical and stress measurements were first performed to demonstrate the influence of the active material arrangement. Considering the heterogeneity of electrochemical processes at the particle-electrolyte interface, a two-dimensional electrochemical-mechanical model of the silicon-graphite composite anode was developed. By combining electrochemical and mechanical field models with experimental validation, this study deepens the understanding of composite electrode structural design and provides practical guidance for optimizing the spatial configuration of electrode materials to significantly improve cell performance.

October 2024