▎ 摘　　要

NOVELTY - Preparing transition metal-graphene composite material involves dispersing nanosheets of transition metal compound by mixing in solvent to obtain transition metal compound nanosheet dispersed material. The dispersed material is added with graphene oxide solution and then the obtained material is mixed with a mixed solvent of isopropyl alcohol and water, where the total mass of transition metal compound nanosheets and graphene oxide is 5-90 wt.%. The obtained mixed solution is added to a reaction vessel and then heating at 180-240 degrees C. USE - Method for preparing transition metal-graphene composite material (claimed) used in lithium ion battery and supercapacitor material. ADVANTAGE - The method enables to prepare transition metal-graphene composite material in simple and reproducible manner, and has improved contact between the active material and electrolyte. DETAILED DESCRIPTION - Preparing transition metal-graphene composite material involves dispersing nanosheets of transition metal compound by mixing in solvent to obtain transition metal compound nanosheet dispersed material. The dispersed material is added with graphene oxide solution and then the obtained material is mixed with a mixed solvent of isopropyl alcohol and water, where the total mass of transition metal compound nanosheets and graphene oxide is 5-90 wt.%. The obtained mixed solution is added to a reaction vessel and then heating at 180-240 degrees C. The heated material is performed a hydrothermal reaction for 16-42 hours and then the obtained material is cooled to room temperature after finishing reaction to obtain a cylindrical hydrogel. The hydrogel is added with hydrazine hydrate solution and then the obtained material is heated at 80-100 degrees C for 8-24 hours. The heated material is cooled to -80 degrees C and then the cooled material is dried under vacuum to obtain the desired product.