▎ 摘　　要

NOVELTY - The preparation method of composite material using graphene oxide and tin dioxide nanoparticles involves weighing 0.1-0.3 g/l graphene oxide aqueous solution, ultrasonically treating and then magnetically stirring, adding 0.25-1 mol/l tin(IV) chloride pentahydrate solution to the stirred graphene oxide aqueous solution, uniformly mixing, adding 2.5-5 g/l urea to the mixture and then ultrasonically treating, heating the mixture at 170-190 degrees C and then maintaining the temperature for 12-36 hours, reacting the mixture and then cooling to room temperature, and annealing. USE - The method is useful for preparation of composite material, which is useful as cathode material in sodium-ion battery. ADVANTAGE - The method enables preparation of composite material with excellent electrochemical stability and electrical conductivity. The composite material provides excellent electrochemical properties to the sodium-ion battery. DETAILED DESCRIPTION - The preparation method of composite material using graphene oxide and tin dioxide nanoparticles involves weighing 0.1-0.3 g/l graphene oxide aqueous solution, ultrasonically treating and then magnetically stirring, adding 0.25-1 mol/l tin(IV) chloride pentahydrate solution to the stirred graphene oxide aqueous solution in a volume ratio of 3:1, uniformly mixing, ultrasonically treating the mixture, adding 2.5-5 g/l urea to the mixture and then ultrasonically treating, placing the mixture in a PTFE hydrothermal reactor and then sealing, heating the mixture at 170-190 degrees C and then maintaining the temperature for 12-36 hours, reacting the mixture and then cooling to room temperature, washing the mixture using deionized water and ethanol and then drying, and annealing under argon gas atmosphere.