▎ 摘　　要

NOVELTY - Preparing graphene modified energy storage material comprises e.g. preparing manganese nitride, Mn3CuN, carbon nanotubes suspension, mixed powder of Mn3CuN and carbon nanotubes, Mn3CuN powder/carbon nanotubes composite material powder particles and Mn3CuN/graphene material, and placing phase-change solid material in a reaction kettle, melting, adding phase change composite auxiliary, placing resultant foamed graphene sheet in a reaction vessel, adding processed liquid phase change material, reactor insulating, absorbing and cooling. USE - The method is useful for preparing graphene modified energy storage material (claimed). ADVANTAGE - The method: has simple preparation method and low cost, and is suitable for industrialized production. DETAILED DESCRIPTION - Preparing graphene modified energy storage material comprises (i) adding nitride in a tube furnace, vacuumizing the tubular furnace for air treatment and then under a nitrogen atmosphere, heating the tubular furnace, heating temperature of 720 degrees C, insulating for 20 hours, the heating at a rate 20 degrees C/minutes and insulating at 720 degrees C to obtain manganese nitride, (ii) mechanical milling manganese nitride and copper powder, then by mechanical milling method so that both fully mixing, mechanical milling time is 20 hours, (iii) adding mechanical milled mixture into tube furnace, pumping the tubular furnace and then under the atmosphere of argon gas, heating the tubular furnace at 700 degrees C, insulating for 10 hour at a heating rate of 20 degrees C/minutes, insulating temperature of 700 degrees C and then cooling to room temperature in an oven to obtain Mn3CuN, (iv) pickling multi-walled carbon nanotubes, using ethanol solution as a dispersant and ultrasonic dispersion to obtain carbon nanotubes suspension, (v) mixing the milled Mn3CuN powder with carbon nanotubes suspension, wet-milling and filtering and drying the obtained mixed solution to obtain mixed powder of Mn3CuN and carbon nanotubes, (vi) filling mixed powder of Mn 3CuN and v into quartz tube and vacuumizing, sealing quartz tube, placing quartz tube in a tube furnace, heating to 290 degrees C, insulating for 2 hours, then heating to 1120 degrees C, insulating for 3 hours, cooling down to room temperature in the furnace, removing sample to obtain Mn3CuN powder/carbon nanotubes composite material, ball milling the prepared Mn3CuN powder/carbon nanotubes composite material powder particles, (vii) coating Mn3CuN powder/carbon nanotubes composite powder particles onto a polyethylene terephthalate film, drying and then performing carbonization and graphitizing processes to obtain Mn3CuN/graphene material, and (viii) placing phase-change solid material in a reaction kettle, melting in a water bath, adding phase change composite auxiliary and stirring for 10-20 minutes to form a uniform liquid phase change material, placing foamed graphene sheet in a reaction vessel, adding processed liquid phase change material, reactor insulating for 60-80 degrees C, absorbing for 20-30 minutes and cooling to obtain Mn3CuN/graphene/phase change modified energy storage material.