Modeling the Impact of Electrode Material Structure on the Performance of Lithium-Ion Batteries: Effects of Porosity and Particle Size

This study investigates the effects of porosity and particle size of electrode material particles on the performance of LiFePO 4 batteries using COMSOL software. A Newman model of a LiFePO 4 -graphite lithium-ion battery is constructed and solved to analyze the impacts of different particle sizes on cell performance and ion/electron transport rate. Based on this, a 3D heterogeneous lithium-ion battery model is developed and solved to examine the effects of various particle porosities on the ion/electron transport rate. The results show that reducing particle size and increasing porosity enhance the performance of lithium-ion batteries. This is attributed to the influence of particle size and porosity on lithium ion diffusion and electrode current density. Overall, optimizing the structure of electrode material particles has the potential to enhance the performance of lithium-ion batteries, providing valuable guidance for battery design and material selection.