▎ 摘　　要

NOVELTY - Preparing nitrogen-doped graphene oxide/manganese trioxide zinc ion battery cathode material comprises e.g. dissolving potassium permanganate and hydrochloric acid in deionized water, stirring, transferring to the high-pressure reactor, placing it in an oven, continuing to react, centrifuging the mixed solution to obtain a precipitate, washing alternately precipitate with ethanol and deionized water, and drying resulting product to obtain a black powder, mixing the product and reducing agent, transferring to an autoclave and placing in an oven for continuous reaction, centrifuging the mixed solution to obtain a precipitate, washing the precipitate with ethanol and deionized water alternately by centrifugation, and drying the product to obtain a black powder, heating in an argon atmosphere, continuing for 4-5 hours and naturally cooling to room temperature, the manganese trioxide material is obtained after uniform grinding. USE - The method is useful for preparing nitrogen-doped graphene oxide/manganese trioxide zinc ion battery cathode material. ADVANTAGE - The composite material: has good stability and conductivity; can provide higher capacity and better electrochemical cycle performance when applied to the anode of an aqueous zinc ion battery; and has broad application prospects. DETAILED DESCRIPTION - Preparing nitrogen-doped graphene oxide/manganese trioxide zinc ion battery cathode material comprises (1) dissolving potassium permanganate and hydrochloric acid in deionized water at a mass ratio of 2:1, stirring for 20-30 minutes, transferring to the high-pressure reactor, placing it in an oven at 150-180 degrees C, continuing to react for 12-24 hours, centrifuging the mixed solution to obtain a precipitate, washing alternately precipitate with ethanol and deionized water for 3-4 times, and drying resulting product at 50-60 degrees C to obtain a black powder, (2) mixing the product and reducing agent in a mass ratio of 2:3, transferring to an autoclave and placing in an oven at 180-200 degrees C for continuous reaction for 4-5 hours, centrifuging the mixed solution to obtain a precipitate, washing the precipitate with ethanol and deionized water alternately by centrifugation 3-4 times, and drying the product at 50-60 degrees C to obtain a black powder, heating to 500-600 degrees C at a heating rate of 2-10 degrees C/minutes in an argon atmosphere, continuing for 4-5 hours and naturally cooling to room temperature, the manganese trioxide material is obtained after uniform grinding, (3) dispersing graphene oxide uniformly in aqueous ammonia, transfering the mixed solution into an autoclave and placing it in an oven at 150-180 degrees C for continuous reaction for 12-24 hours, centrifuging the mixed solution to obtain a precipitate, alternately centrifuging the precipitate with ethanol and deionized water for 3-4 times, and drying the resulting product at 50-60 degrees C to obtain a black powder, (4) dissolving the product and the product in N-N dimethylpyrrolidone at a mass ratio of 1:4 to obtain a uniform suspension under the action of ultrasound, performing suction filtration, and drying the product in vacuum at 60-80 degrees C to obtain a nitrogen-doped graphene oxide/manganese trioxide composite material and (5) taking the powdered product, conductive agent and binder, mixing them in a mass ratio of 8:1:1, and dropping them into N-methylpyrrolidone, grinding with a ball mill for 2-4 hours, coating mixed slurry on a stainless steel foil and drying at 80-110 degrees C for 10-14 hours under vacuum conditions to obtain a anode material.