Preparation method of graphene water-based paint and application of graphene water-based paint to aluminum foil

The invention provides a graphene water-based paint preparation method, which comprises: mixing crystalline flake graphite, an oxidizing agent and an intercalator according to a mass ratio of 1: (0.1-10): (0.1-5), and carrying out water bath to obtain a reaction liquid; adding deionized water into the reaction liquid, washing, filtering and drying to obtain a powder product; placing the powder product in a muffle furnace for heat treatment to obtain a graphene precursor; mixing and infiltrating the graphene precursor with deionized water and a dispersing agent, and then performing liquid-phase stripping to obtain graphene conductive slurry; dispersing and shearing the graphene conductive slurry to obtain small-sheet-diameter graphene slurry; and stirring the small-sheet-diameter graphene slurry, and adding a film-forming agent and a curing cross-linking agent to obtain the graphene water-based paint. When the prepared graphene coated carbon aluminum foil is used as a positive current collector to be applied t