Pretreatment coating with three-dimensional structure on the surface of positive electrode current collector and its preparation method and application

Abstract

The present invention discloses a pretreatment coating with a three-dimensional structure on the surface of a positive electrode current collector, a preparation method, and an application thereof. The preparation method comprises: step S1, weighing raw materials in parts by mass, including: 5 parts to 15 parts of nano-carbon material, 2 parts to 10 parts of three-dimensional structure zeolite, 2 parts to 10 parts of solid electrolyte, 1 part to 15 parts of dispersant, 0.1 parts to 1 part of thickener, 0.1 parts to 0.5 parts of wetting agent, 40 parts to 91 parts of water, 0.1 parts to 0.5 parts of leveling agent, 0.1 parts to 1 part of pH regulator, and 4 parts to 10 parts of binder; step S2, dispersing the raw materials, mixing them uniformly, and obtaining a mixed slurry; step S3, coating the mixed slurry on the surface of the positive electrode current collector, and obtaining a pretreatment coating with a three-dimensional structure on the surface of the positive electrode current collector after drying and curing; the three-dimensional structure zeolite structure, nano-carbon material, and solid electrolyte in the pretreatment coating form a stable interpenetrating network structure, which can significantly reduce the internal resistance of the battery, improve the dynamic internal resistance consistency of the battery, and extend the cycle life of the battery.

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