▎ 摘　　要

NOVELTY - Preparing cobalt sulfate/hard carbon/three-dimensional graphene composite material comprises (i) performing acidification treatment on glass fiber to obtain an oxygen-containing functional group-modified glass fiber, (ii) adding an oxygen-containing functional group-modified glass fiber into a mixed solution of cobalt nitrate and 2-methylimidazole, and allowing to stand to obtain a cobalt metal-organic framework/glass fiber composite material, (iii) pyrolyzing the cobalt metal-organic framework/glass fiber composite material to obtain a cobalt sulfate/carbon/glass fiber composite material, where the carbon in the cobalt sulfate/carbon/glass fiber composite material is a porous carbon nanosheet array; and (iv) placing the cobalt sulfate/carbon/glass fiber composite material and sulfur powder in a mixed atmosphere of argon and air for high-temperature treatment. USE - The method for preparing cobalt sulfate/hard carbon/three-dimensional graphene composite material is useful for sodium-ion battery cathode materials (claimed). ADVANTAGE - The method has reasonable design, is convenient, avoids the agglomeration of the nano-particle, and ensures the circulation stability of the electrode material, and has good charge and discharge performance and long cycle life. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a cobalt sulfate/hard carbon/three-dimensional graphene composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart of method for preparing cobalt sulfate/hard carbon/three-dimensional graphene composite material for sodium-ion battery cathode materials (Drawing includes non-English language text).