▎ 摘　　要

NOVELTY - A composite material comprises three-dimensional layered graphene oxide as the attachment site of nitrogen-doped multi-walled carbon nanotubes and iron disulfide spheres. The neural network structure of the carbon nanotubes serves as a connecting channel for iron disulfide spheres. The diameter of the iron disulfide balls is less than 3 mu m. USE - Composite material used as negative electrode material of sodium ion battery (all claimed). ADVANTAGE - The composite material has improved surface conductivity, improved rate performance and cycle performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite material, which involves dissolving nitrogen-doped multi-walled carbon nanotubes in ethylene glycol, adding polyvinylpyrrolidone and graphene oxide, ultrasonically processing, mixing ferric trichloride hexahydrate and thioacetamide in deionized water, stirring, adding hydrazine hydrate to obtain a mixture, adding the mixture to the carbon nanotube solution, hydrothermally reacting the mixture, and repeatedly washing the mixture with deionized water and ethanol.