▎ 摘　　要

NOVELTY - A zinc-cobalt sulfide/graphene composite material comprises graphene with a network structure as carrier and zinc-cobalt sulfide nanoparticles which are supported on the surface of the graphene. The zinc-cobalt sulfide nanoparticles comprises zinc-cobalt sulfide shell and zinc-cobalt sulfide core wrapped in the zinc-cobalt sulfide shell and there is a gap between the zinc-cobalt sulfide shell and zinc-cobalt sulfide core. USE - The zinc-cobalt sulfide/graphene composite material is used as cathode material of sodium ion battery (claimed). ADVANTAGE - The spatial structure of the core-shell zinc-cobalt sulfide nanoparticles helps to relieve the volumetric strain of the material during the sodium insertion/de-sodium removal process and enhances conductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite material comprising dissolving zinc source and cobalt source in the first alcohol and heating to react to generate zinc cobalt precursor; dissolving zinc-cobalt precursor in the second alcohol, adding third alcohol dispersion of graphene, heating, and reacting to generate zinc-cobalt/graphene precursor; and dissolving with thioacetamide in fourth alcohol, heating, and reacting.