▎ 摘　　要

NOVELTY - Preparation of layered structure nickel cobaltate-nitrogen-containing graphene composite material comprises mixing and grinding 0.03 mmol cobalt(II) acetate tetrahydrate, 0.06 mmol nickel(II) acetate tetrahydrate, and 0.04 g nitrogen-containing reduced graphene oxide in agate mortar; adding 0.15g acetic acid, grinding, collecting obtained powder, and washing with deionized water; storing vacuum oven for 8 hours; and annealing in the air at 350degreesC. USE - The method is used for preparing layered structure nickel cobaltate-nitrogen-containing graphene composite material in supercapacitor (claimed). ADVANTAGE - The solid phase reaction method is simple and reliable. The method is convenient for large scale production. The layered structure cobalt acid nickel-nitrogen-containing graphene composite material has rich pores, multi-layer graded core-shell structure, uniform grain size, high conductivity and excellent stable electrochemical activity, and high energy density. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for testing method of layered structured nickel cobaltate-nitrogen-containing graphene composite material in a supercapacitor comprising putting a piece of foamed nickel into a beaker at room temperature, sonicating with acetone, 0.5 M hydrochloric acid, distilled water, and absolute ethanol in sequence for 20 minutes, drying, and weighing; placing composite material, superconducting carbon black and polyvinylidene fluoride in a mortar, grinding repeatedly for 0.5 hour, adding 2 drops of N-methylpyrrolidone solution, grinding, applying slurry on the foamed nickel, washing and drying; and vacuum drying for 6 hours at 60degreesC, weighing, and using 6 M potassium hydroxide as electrolyte, platinum electrode as counter electrode, and saturated calomel electrode as reference electrode for three-electrode electrochemistry test.