Surface Engineering Based on Conductive Agent Dispersion Uniformity: Strategies Towards Performance Consistency of Lithium-Ion Batteries

Abstract

The consistency of lithium-ion battery performance is the key factor affecting the safety and cycle life of battery packs. Surface engineering of electrode in production processes play an important role on improving the consistency of battery performance. In the present study, drying process in the electrode manufacturing process is studied as the effect on surface engineering of the electrode materials, with consideration on impacting the battery performance. Specifically, the solid content of the slurry and drying temperature are considered to be two factors that affect conductive agent dispersion uniformity in the porous electrode. To achieve surface engineering on the dispersion uniformity of conductive agent, the optimal processing parameters can be obtained by adjusting the temperature and solid content of the slurry. The mechanism on dispersion uniformity of conductive agent is mainly related to the PVDF grid structure. In the lithium-ion battery, the electrode coated with 66% solid slurry and dried at 90~100 °C presents stable energy storage performance, which is beneficial to ensure the performance of battery pack in the application process.

Keywords: Conductive agent distribution, Surface engineering, Electrical performance consistency, Drying temperature, Solid slurry content