▎ 摘　　要

NOVELTY - Preparing carbon nanotubes (CNTs)-tin sulfide-graphene oxide heterostructure composite material involves mixing the tin source solution and the graphene dispersion evenly, then adding the pretreated multi-walled carbon nanotubes and the surfactant and mixing them evenly, adding the sulfur source solution and stirring until the tin source and the sulfur source are fully reacted and fully mixed, then ultrasonically dispersing to mix to obtain solution The obtained solution was fully reacted in a solvothermal kettle at 140-180℃, and then filtered to obtain a gray-black precipitate, which is washed and dried to obtain product. The preparation process of the pretreated multi-walled carbon nanotubes includes pickling and ultrasonically treating the multi-walled carbon nanotubes, washing and drying the acid-washed multi-walled carbon nanotubes to obtain pretreated multi-walled carbon nanotubes. The components of the tin source solution include tin sourc. USE - Method for preparing carbon nanotubes (CNTs)-tin sulfide-graphene oxide heterostructure composite material used sed to prepare a negative electrode of a sodium-ion battery (claimed). ADVANTAGE - The method produces product which has high specific energy and excellent electrochemical performance, in simple manner. DETAILED DESCRIPTION - Preparing carbon nanotubes (CNTs)-tin sulfide-graphene oxide heterostructure composite material involves mixing the tin source solution and the graphene dispersion evenly, then adding the pretreated multi-walled carbon nanotubes and the surfactant and mixing them evenly, adding the sulfur source solution and stirring until the tin source and the sulfur source are fully reacted and fully mixed, then ultrasonically dispersing to mix to obtain solution The obtained solution was fully reacted in a solvothermal kettle at 140-180℃, and then filtered to obtain a gray-black precipitate, which is washed and dried to obtain product. The preparation process of the pretreated multi-walled carbon nanotubes includes pickling and ultrasonically treating the multi-walled carbon nanotubes, washing and drying the acid-washed multi-walled carbon nanotubes to obtain pretreated multi-walled carbon nanotubes. The components of the tin source solution include tin source, reducing acid and alcohol solvent, and the pH value of the tin source solution is -1-0. The sulfur source solution adopts the ethylene glycol solution of the sulfur source, the molar ratio of carbon nanotubes, tin, sulfur, and graphene oxide is 1:(0.8-1.2):(0.8-1.2):1.