Battery Binder Composition for Adhesion-Handleability Balance

The invention changes the chemical parameters of the binder composition by specifying a particular polymer with a glass transition temperature of -50°C to -100°C and specific functional group content (0.1-10 mmol/g). This parameter optimization allows the binder to provide sufficient adhesion during processing while maintaining low tackiness at storage temperatures, thus resolving the contradiction between process adhesiveness and handleability

The invention uses a composite binder system that combines a specific polymer matrix with functional groups (carboxyl, hydroxyl, or amine groups) and optionally incorporates inorganic particles or other polymers. This composite approach enhances adhesion to electrode materials and current collectors while the polymer selection prevents blocking, simultaneously achieving both process adhesiveness and handleability

The invention optimizes the glass transition temperature parameter to a specific range (-50°C to -100°C) that prevents the binder from becoming too soft and sticky at processing temperatures. This parameter control ensures that the functional layer adheres properly during electrode formation but does not stick to rolls during pressing operations, thereby maintaining high productivity

The binder composition exhibits different properties at different temperature conditions: at room temperature it provides low stickiness for easy handling, while at processing temperatures it provides sufficient adhesion. This temperature-dependent local quality allows the same binder to prevent both blocking during storage and sticking during roll pressing, ensuring both handleability and productivity