EFFECT OF MICROSTRUCTURES IN LITHIUM ION BATTERY ELECTRODES

Abstract

In a Lithium-ion battery, increases in the effective conductivity can lead to a reduction in internal cell resistance and improved cell performance. Previous efforts to improve cell conductivity have focused on the effect of conductive additives in the electrode, but particle interaction within the electrode plays a critical role. This study investigates the effect of Li-ion particle shape on the effective conductivity of Li-ion battery electrodes. Generated 3D electrode microstructure models consisting of active material, binder, conductive additive, and an electrolyte are based on macroscopic parameters or imported experimental data. This work considers spherical, cylindrical, and cubic electrode active materials for virtual material analysis. The effective conductivity was evaluated using these 3D microstructures. The effective conductivity of the electrode was found to be indirectly dependent on the shape of the active material within the electrode. This virtual electrode simulation offers a theoretical guideline for optimal Li-ion electrode battery design.