▎ 摘　　要

NOVELTY - Preparing sodium-ion battery cathode material i.e. nickel-cobalt-sulfide-graphene nanosheet (I), comprises (1) mixing concentrated nitric acid and graphene nanosheet slurry, and reacting to obtain activated graphene nanosheet (GNs), (2) mixing nickel(II) nitrate and cobalt(II)nitrate with GNs methanol solution to obtain solution A and mixing methanol solution of 2-methylimidazole with solution A to obtain solution B, and (3) mixing thioacetamide solution with solution B and reacting to obtain final product. USE - The method is useful for preparing cathode material for sodium-ion battery (claimed). ADVANTAGE - The method: utilizes metal-organic frameworks as sacrificial templates to in situ grow hollow nanocages nickel-cobalt-sulfide (NiCo2S4) on the surface of graphene nanosheets (GNs) by one-step solvothermal method; is simple; has excellent crystallinity; and realizes uniform in-situ growth and hollow nano-cage structure on the surface of graphene nano-sheets. (I): exhibits excellent cycling and rate performance as the cathode material for sodium-ion batteries; and has excellent rate performance under different current densities. DETAILED DESCRIPTION - Preparing sodium-ion battery cathode material i.e. nickel-cobalt-sulfide-graphene nanosheet of formula ((NiCo2S4GNs) (I), comprises (1) mixing concentrated nitric acid and graphene nanosheet slurry, and reacting to obtain activated graphene nanosheet (GNs), (2) mixing nickel(II) nitrate and cobalt(II) nitrate with GNs methanol solution to obtain solution A and mixing methanol solution of 2-methylimidazole with solution A to obtain solution B, and (3) mixing thioacetamide solution with solution B and reacting to obtain final product.