▎ 摘　　要

NOVELTY - A cobalt carbide doped reduced graphene oxide/carbon nanotube/sulfur composite material comprises reduced graphene oxide-carbon nanotube hybrid material, cobalt carbide particles and sulfur particles loaded on the reduced graphene oxide/carbon nanotube hybrid material. USE - Cobalt carbide doped reduced graphene oxide/carbon nanotube/sulfur composite material used as positive electrode material in positive electrode sheet of lithium-sulfur battery (all claimed). ADVANTAGE - The method is simple, and provides composite material with large specific surface area, porous structure, and high conductivity. The lithium-sulfur battery prepared using the composite material can improve the cycle performance and rate performance of positive electrode materials, so the problem of excessive capacity fading during the electrode reaction process is solved. DETAILED DESCRIPTION - A cobalt carbide doped reduced graphene oxide/carbon nanotube/sulfur (Co2C-RGO-CNT/S) composite material comprises reduced graphene oxide-carbon nanotube (RGO-CNT) hybrid material, cobalt carbide particles and sulfur particles loaded on the reduced graphene oxide/carbon nanotube (RGO-CNT) hybrid material. An INDEPENDENT CLAIM is included for preparation of the cobalt carbide doped reduced graphene oxide/carbon nanotube/sulfur composite material, which involves using compound containing cobalt ions and graphene oxide as raw materials, using reflux reaction, depositing complex compound containing cobalt ions on the surface of graphene oxide, growing carbon nano tube on the surface of the reduced graphene by chemical vapor deposition (CVD) method, annealing, generating cobalt carbide particles on the surface of reduced graphene oxide to obtain cobalt carbide doped reduced graphene oxide-carbon nanotube composite material (Co2C-RGO-CNT), and adhering the sulfur particles to the surface of the composite material by melting and diffusion method.