Clarifying the migration behavior of components during drying of Li-ion battery electrodes

A study conducted by Naomi KUMANO et al., in collaboration with Kyushu Institute of Technology, was published in the Journal of Power Sources.

As the production of electric vehicles expands, better performance and productivity of lithium-ion batteries are required. When a slurry containing a uniform mixture of these materials is coated and dried onto the current collector to prepare the electrode with high temperature for high-speed production, migration occurs, which leads to a nonuniform distribution of components in the thickness direction. Migration in an electrode result in a heterogeneous distribution of the components, which adversely affects electrode performance and durability. Hence, in this study, we focused on the migration behavior of components during drying of an electrode slurry. Herein, the component distribution was investigated using a novel method, and their relationship with electrode properties was determined. The impact of migration on adhesive strength and electric resistance, which affect performance and durability, was revealed. The proposed method will enable the design of an electrode manufacturing process that achieves high performance and high productivity.

Title: Migration of Binder and Conductive Agent during Drying Process of Li-ion Battery Cathodes
Authors: Kumano, N., Yamaguchi, Y., Akimoto, Y., Ohshima, A., Nakamura, H., Yamamura, M.
Journal Name: Journal of Power Sources
Published: January 30, 2024
https://doi.org/10.1016/j.jpowsour.2023.233883