▎ 摘　　要

NOVELTY - The preparation of tin selenide/graphene composite electrode material for sodium ion battery negative electrode involves adding graphene oxide with deionized water, ultrasonically treating, stirring to obtain mixture (A), adding tin chloride dehydrate to mixture (A), ultrasonically treating, stirring to obtain mixture (B), transferring mixture (B) to kettle, placing in homogeneous water reactor, reacting, cooling, separating reaction by centrifugation, freeze drying to obtain tin oxide/graphene composite, mixing obtained composite and selenium powder, heat preserving, washing and drying. USE - Preparation of tin selenide/graphene composite electrode material for sodium ion battery negative electrode (claimed). ADVANTAGE - The method enables preparation of environmentally-friendly tin selenide/graphene composite electrode material for sodium ion battery negative electrode by simple process, and achieves high repetition rate and mass productivity. DETAILED DESCRIPTION - The preparation of tin selenide/graphene composite electrode material for sodium ion battery negative electrode involves adding 30-80 mg graphene oxide with 20-80 ml deionized water, ultrasonically treating, stirring mixture for 30-150 minutes to obtain mixture (A), adding 0.2-3.38 g tin chloride dehydrate to the mixture (A), ultrasonically treating, stirring mixture for 10-120 minutes to obtain mixture (B), transferring the mixture (B) to Teflon (RTM: PTFE) hot water kettle, placing in a homogeneous water reactor, reacting at 120-210 degrees C for 2-12 hours, cooling at room temperature after the reaction, separating the reaction by centrifugation, freeze drying to obtain tin oxide/graphene composite, uniformly mixing tin oxide/graphene composite and selenium powder, heat preserving at 500-900 degrees C for 0.5-5 hours under vacuum or inert gas protection, washing powder with water and ethanol, and drying.