This technology is a coating composition in which an acrylic rubber compound—consisting of alumina ceramic particles, a rubber binder, a water-soluble dispersant, and a water-soluble wetting agent—is dispersed in a water-based solvent. It ensures the thermal stability of the coating layer and enhances adhesion to the substrate.
Conventional ceramic coating solutions are based on organic solvents, posing significant risks of environmental pollution and worker exposure. They also suffer from poor adhesion between the separator substrate and the ceramic layer, as well as issues with thermal shrinkage and potential meltdown of the separator at high temperatures.
This technology utilizes a water-based coating solution containing an emulsion-polymerized acrylic copolymer rubber binder, a silicone-based acrylate dispersant, an ester-based acrylate wetting agent, and a carboxymethyl cellulose sodium salt viscosity modifier to control the thermal shrinkage of the coating layer to within 0–1%. It can be applied to ceramic coating lines for polyolefin porous separators and the manufacturing of high-safety cells for EVs and ESS, allowing for the production of separators with reduced high-temperature short-circuit risks while eliminating the burden of organic solvent exhaust and recovery systems.
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