▎ 摘　　要

NOVELTY - Preparation of aminated nano-graphene involves mixing 2 g graphite flakes with 220 mL concentrated sulfuric acid and concentrated nitric acid in volume ratio of 10:1, stirring at 45degrees Celsius for 30 minutes, adding 12 g potassium permanganate, stirring for 40 minutes, heating at 60degrees Celsius for 7 hours and 90degrees Celsius for 40 minutes, naturally cooling to room temperature, mixing with deionized water in volume ratio 1:5, reacting with hydrogen peroxide in volume ratio of 10:1, separating the acidic graphene oxide solution obtained by adding excess deionized water, washing, freeze-drying, preparing acidic graphene oxide powder prepared by Hummers method into 0.5 mg/mL solution, mixing with 20-80% aminating agent, aminating in microwave digestion apparatus at 800 W for 1 minute, loading into autoclave, heating at 180-220degrees Celsius for 3-5 hours, suspending in deionized water, pouring out the upper liquid and freeze-drying. The mass ratio of potassium permanganate to graphite is 6:1. USE - Preparation of aminated nano-graphene for preparing button-type supercapacitors (claimed). ADVANTAGE - The method provides aminated nano-graphene composite material with excellent electrochemical performance after hydrothermal reduction. The material has nanofibrous and porous structure, large specific surface area, high specific capacity, and excellent stability. The electrolyte ion can be quickly diffused after the supercapacitor is used, which improves the specific capacity, and stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the application method of the nano-graphene composite material prepared by the method to manufacture button-type supercapacitors, which involves (1) weighing active material nitrogen-containing graphene, conductive agent acetylene black and binder polyvinylidene fluoride in a weight ratio of 80:10:10, adding deionized water, coating the slurry evenly on the nickel foam, drying to obtain electrode sheet, and assembling with lower case, current collector (nickel foam)/positive electrode, diaphragm, negative electrode/current collector (nickel foam), gasket, spring, 6 mol/L potassium hydroxide electrolyte and upper case in this order in a vacuum glove box.