▎ 摘　　要

NOVELTY - The preparation method of highly graphitized three-dimensional carbon nanotube graphene composite material involves (1) mixing carbon nanotubes and graphene according to mass ratio of (1-3):1, adding ethanol, ultrasonically dispersing, placing in oven, and drying at 50-60 degrees C to obtain carbon nanotubes and graphene composite, (2) adding the carbon nanotubes and graphene composite obtained in the step (1) to a high-temperature graphitizing furnace under the protection of argon gas, using the programming method, and heating. USE - Preparation method of highly graphitized three-dimensional carbon nanotube graphene composite material used as positive electrode sulfur-containing material for lithium-sulfur battery (all claimed). ADVANTAGE - The method enables preparation of highly graphitized three-dimensional carbon nanotube graphene composite material with improved electrical conductivity and thermal conductivity, effectively repairs the surface defect structure of the carbon material, eliminates the oxygen-containing functional groups on the surface, exhibits charge-discharge cycle of high rate and large current, and effectively protects the integrity of the separator, by simple process. DETAILED DESCRIPTION - The preparation method of highly graphitized three-dimensional carbon nanotube graphene composite material involves (1) mixing carbon nanotubes and graphene according to mass ratio of (1-3):1, adding ethanol, ultrasonically dispersing, placing in oven, and drying at 50-60 degrees C to obtain carbon nanotubes and graphene composite, (2) adding the carbon nanotubes and graphene composite obtained in the step (1) to a high-temperature graphitizing furnace under the protection of argon gas, using the programming method, heating at 1200 degrees C and rate of 300-400 degrees C/0.5 hour, 2850 degrees C and rate of 200-300 degrees C/0.5 hour and 2850 degrees C for 1-5 hours. An INDEPENDENT CLAIM is included for application of highly graphitized three-dimensional carbon nanotube graphene composite material as positive electrode sulfur-containing material for lithium-sulfur battery (1) mixing highly graphitized three-dimensional carbon nanotube graphene composite material and elemental sulfur according to mass ratio of 1:(1-4), uniformly milling the mixture, adding carbon disulfide in liquid-mass ratio of 1:(10-20), stirring, reacting at 10-25 degrees C until the carbon disulfide is completely volatilized, adding the remaining materials to oven, heating at 155 degrees C for 12 hours, and cooling to room temperature to obtain highly graphitized three-dimensional carbon nanotube graphene/sulfur composite material, where the mass ratio of the material is the ratio of the sum of highly graphitized three-dimensional carbon nanotube graphene composite material and elemental sulfur to the mass of carbon disulfide, (2) mixing highly graphitized three-dimensional carbon nanotube graphene/sulfur composite material obtained in the step (1), carbon black and polyvinylidene fluoride according to the mass ratio of 1:(0.05-0.25):(0.05-0.15), adding N-methylpyrrolidone, uniformly stirring and ultrasonically dispersing, and controlling the viscosity at 1000-5000 cps to obtain slurry, uniformly coating the obtained slurry on a current collector aluminum foil with thickness of 150-750 mm, transferring the foil to oven, and drying at 55 degrees C.