Zwitterionic Lithium Battery Binder for Adhesion and Low Resistance

The binder uses a composite polymer structure combining polyacrylic acid (or its metal salt) with polyacrylonitrile (or polyamide) in a specific ratio (30-70 wt% and 70-30 wt% respectively). This composite structure integrates the strong adhesive properties of polyacrylic acid with the conductive characteristics of polyacrylonitrile, achieving both high adhesive strength and low electrical resistance simultaneously

The invention optimizes the molecular weight parameters of the polymer components (polyacrylic acid: 100,000-1,000,000 g/mol; polyacrylonitrile: 50,000-500,000 g/mol) and their composition ratio to achieve the optimal balance between adhesive strength and electrical conductivity. By controlling these parameters, the binder maintains strong adhesion while minimizing electrical resistance

The optimized binder composition and molecular weight parameters reduce internal resistance of the electrode, enabling faster ion transport and electron conduction. This allows rapid charging at higher C-rates without causing excessive heat generation or mechanical stress that would degrade the cell, thereby maintaining cell lifespan even at improved charging speeds

The composite binder structure provides both strong adhesion to maintain electrode integrity during rapid charging cycles and sufficient conductivity to handle high current loads. This dual functionality enables rapid charging while preventing the capacity reduction and lifespan degradation typically associated with fast charging