Infrared-Based Drying Method in Lithium-Ion Battery Electrodes

Conventional electrode drying processes act as a massive bottleneck in lithium-ion battery (LIB) manufacturing. Current processes typically rely on large convection ovens followed by vacuum post-drying to remove residual solvent and moisture. These steps are energy-intensive, require a large factory footprint, and add complexity to electrode production. In addition, conventional drying provides limited control over the polymeric binder structure, even though binder crystallinity, phase behavior, and distribution strongly influence electrode adhesion, internal resistance, and long-term electrochemical stability.

 

Researchers at Arizona State University have developed an infrared-based drying process to improve the manufacturing process of cathodes for lithium-ion batteries. In this approach, IR drying rapidly heats the coated cathode surface in a controlled manner, enabling effective solvent and moisture removal while simplifying the conventional drying sequence that typically requires an additional vacuum post-drying step. Beyond process simplification, the IR drying condition can also regulate the crystallinity and phase behavior of polymeric binders, which are critical to electrode adhesion, internal resistance, and long-term electrochemical stability. Among tested methods, IR-Post drying demonstrated superior mechanical adhesion, efficient solvent removal, and lower internal resistance, which lead to enhanced rate performance and stable capacity retention over extensive cycling.

 

This infrared drying technology contributes to superior electrode mechanical integrity, efficiency and electrochemical performance in battery cells.

 

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