▎ 摘　　要

NOVELTY - Preparing heterostructure composite involves mixing graphene nanosheets, carbon nanotubes, a nickel source, a cobalt source, a sulfur source and a solvent, carrying out a solvothermal reaction to obtain a composite material and mixing the composite material, crystalline stannic chloride, a sulfur source, ammonium fluoride and a solvent, and then carrying out a solvothermal reaction to obtain the heterostructure composite material. USE - Method for preparing heterostructure composite material used in a negative electrode of a sodium ion battery (claimed). ADVANTAGE - The heterogeneous structure composite material provided by the method can use the alloying reaction of tin nano particle and sodium ion in the conversion reaction, providing high specific capacity, heterogeneous structure also can promote the charge transport of the heterogeneous interface, surface the reaction kinetics. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a heterostructure composite material.