Graphene high-nickel ternary composite material and preparation method thereof

The invention relates to the field of high-nickel ternary material modification, and provides a graphene high-nickel ternary composite material and a preparation method thereof.The mother liquor is prepared according to the mass percent, and the mother liquor is prepared from, by mass, 98%-99% of N-methyl pyrrolidone, 0.5% of polyvinylidene fluoride, 0.1% of a polyvinylidene fluoride coalescing agent and 0.5%-0.8% of graphene; adding 1 part by mass of high-nickel ternary material powder into 1-2 parts by mass of mother liquor, and fully infiltrating to obtain mixed slurry; dropwise adding the mixed slurry into absolute ethyl alcohol to obtain absolute ethyl alcohol dispersion liquid, homogenizing the absolute ethyl alcohol dispersion liquid, and performing spray drying under the protection of inert atmosphere to obtain the composite material. According to the preparation method, the influence of air vapor on the high-nickel NCM material is eliminated through an organic solvent replacement-coating strategy, ir