▎ 摘　　要

NOVELTY - A graphene high-nickel ternary composite material comprises 2 parts mass high-nickel ternary material powder and 1-2 parts mass mother liquor. The mother liquor comprises 98-99 %mass N-methyl pyrrolidone, 0.5 %mass polyvinylidene fluoride, 0.1 %mass polyvinylidene fluoride film-forming aid and 0.5-0.8 %mass graphene. USE - Graphene high-nickel ternary composite material used as positive electrode material in vehicle power battery. ADVANTAGE - The method integrates high conductivity and high specific surface area of graphene, high pressure resistance of polyvinylidene flouride-5130 (PVDF-5130) and film forming property of polyimide (PI) through the solution replacement-coating method, and uniformly coats a layer of semitransparent graphene-PVDF 5130-PI composite film on the surface of the high-nickel ternary material to obtain the graphene-PVDF-5130-PI/high-nickel ternary composite material, so the conductivity of the high-nickel ternary material is improved. The composite material only needs to add 1.5 wt.% Super P(RTM: conductive carbon black) as conductive agent, and the resistivity of the electode can be reduced to 3.2 Ω.cm. The high specific surface area graphene composite film improves the liquid absorption capacity of the electrode and improves the rate performance of the battery. The performance is better than that of the array carbon nano tube conductive agent comparison group under 5C/3C charge and discharge conditions and the high pressure resistance performance of the material is improved. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the graphene high-nickel ternary composite material, which involves adding high-nickel ternary material powder into the mother liquor to fully soak to obtain mixed slurry, dripping the mixed slurry into absolute ethyl alcohol to obtain an absolute ethyl alcohol dispersion liquid, homogenizing the dispersion liquid, and carrying out spray drying under the protection of inert atmosphere.