▎ 摘　　要

NOVELTY - Composite material comprises cobalt oxide nanocrystal and graphene, where the grain diameter of the cobalt oxide nanocrystal is 2.5-7 nm, the graphene is sheet structure, the cobalt oxide nanocrystal is uniformly grown on graphene. USE - The material is useful for organic system lithium oxygen batteries as as anode catalyst (claimed). ADVANTAGE - The material has good dispersity and no agglomeration phenomenon so that the catalytic performance is good. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing composite material comprising (i) adding the graphite oxide in the first organic solvent and dispersing, (ii) adding acetylacetone cobalt and octadecylamine, heating the mixture at 120-140 degrees C, keeping for 20-50 minutes, raising the temperature, boiling solution and reflux, maintaining for 5-1 hours, where the graphite oxide, cobalt acetylacetonate mass of the substance is 10-40 mg/mmol, the mass ratio of the graphite oxide and the octadecylamine is 1:80-1:25:3, adding the second organic solvent, stopping the reaction, separating out solid, washing and drying the solid, (iv) drying the solid after heat treatment in an inert gas for 1-3 hours, and the temperature of the heat treatment is 350-450 degrees C.