▎ 摘　　要

NOVELTY - Sheet-like nickel sulfide / nickel vanadium double hydroxide / graphene composite material is represented by linear structure, where the X represents different curing time, and the value of X is 1-7. USE - Sheet-like nickel sulfide / nickel vanadium double hydroxide / graphene composite material used for supercapacitors and as excellent super capacitor electrode material. ADVANTAGE - The sheet-like nickel sulfide / nickel vanadium double hydroxide / graphene composite material is easy to prepare, cost-effective, has high specific capacity, good rate performance and cycle stability, exhibits high power density and energy density. DETAILED DESCRIPTION - Sheet-like nickel sulfide / nickel vanadium double hydroxide / graphene composite material is represented by linear formula Ni3S2 / NiV-LDH / rGO / NF-X, where the X represents different curing time, and the value of X is 1-7. An INDEPENDENT CLAIM is included for a method for preparing a sheet-like nickel sulfide / nickel vanadium double hydroxide / graphene composite material, which involves: (A) using chemical deposition method to grow reduced graphene oxide on nickel foam substrate, adding graphene oxide to deionized water according to the ratio, dispersing ultrasonically to get brown dispersion liquid, adding reducing agent to the dispersion liquid, stirring to obtain mixed solution; (B) using nickel substrate cleaned with acetone, immersing hydrochloric acid, and absolute ethanol in the mixed solution, reducing in a hydrothermal bath at 90 degrees C for 6 hours, removing foamed nickel substrate; (C) rinsing residue, and placing in an oven at 60 degrees C, drying for 12 hours to obtain a foamed nickel substrate with reduced graphene oxide, denoted as rGO / NF; (D) dissolving nickel chloride, ammonium metavanadate, ammonium fluoride, and urea in deionized water, and stirring at room temperature until a uniform light green precursor solution, placing rGO / NF into the reaction kettle and keeping at 180 degrees C for 8 hours, taking out and washing to obtain the composite material NiV / rGO / NF; and (E) dissolving hydrothermal vulcanization of NiV / rGO / NF, sodium sulfide neohydrate in deionized water according to the ratio, stirring, dissolving, transferring to the reaction kettle, placing NiV / rGO / NF into the reaction kettle, at 120 degrees C, maintaining at 1 degrees C for 1-7 hours, removing, washing and drying to obtain final product.