▎ 摘　　要

NOVELTY - Nitrogen-doped graphene composite electrode material is prepared by adding concentrated sulfuric acid with natural graphite powder, sodium nitrate and potassium permanganate under ice bath condition, stirring for 30 minutes, heating to 35 degrees C, then adding deionized water, continuously heating to 95 degrees C, adding hydrogen peroxide solution, and filtering to obtain graphite oxide; adding graphite oxide, melamine and ethanol solution, heating and boiling resulting solution and drying at 120 degrees C for 6 hours; and heating dried material in a tubular furnace to 950 degrees C under nitrogen protection. USE - Method of preparing nitrogen-doped graphene composite electrode material (claimed). ADVANTAGE - The method can obtain nitrogen-doped graphene electrode material having reversible capacity with increasing continuous charge-discharge process and with excellent chemical stability. DETAILED DESCRIPTION - Preparation of nitrogen-doped graphene composite electrode material comprises: (A) adding concentrated sulfuric acid with natural graphite powder, sodium nitrate and potassium permanganate in a beaker under ice bath condition, stirring for 30 minutes, heating to 35 degrees C, then adding deionized water, continuously heating to 95 degrees C, adding hydrogen peroxide solution, filtering and washing till pH value is 7 to obtain graphite oxide, where weight ratio of graphite powder, sodium nitrate, potassium permanganate, deionized water, and hydrogen peroxide is 1:0.5:3:100:10; (B) adding graphite oxide and melamine at mass ratio of 3:2, adding ethanol solution and stirring for 5 hours; (C) heating and boiling resulting solution to remove ethanol and drying at 120 degrees C for 6 hours; (D) putting dried material in a tubular furnace, heating to 950 degrees C under nitrogen protection at heating rate of 5-8 degrees C/minute and reacting for 30 minutes; and (E) reducing temperature of system to room temperature, adding boiled deionized water, and ultrasonic processing for 20 hours to obtain nitrogen-doped graphene composite electrode material.