▎ 摘　　要

NOVELTY - A preparation method of oxalic acid-assisted synthetic tin dioxide nano-particle composite graphene high performance lithium storage material, involves (S1) adding soluble tin salt and small molecular organic acid into ultra-pure water, mixing uniformly, adding organic solvent, stirring uniformly to obtain solution (A), and adding oxalic acid to ultra-pure water to obtain solution (B), (S2) dropping the solution (B) into the solution (A), and stirring to mix uniformly to obtain solution (C), (S3) placing the solution (C) in a closed space, heating to 60-200degreesC to react, after finishing reaction, cooling to room temperature, centrifuging, washing, and drying to obtain tin dioxide nanoparticles, and (S4) dispersing the tin dioxide nanoparticles and graphene oxide in water, ball milling and removing liquid to obtain a final product, where the organic solvent is ethanol, glycol or propanetriol. USE - Preparation method of oxalic acid-assisted synthetic tin dioxide nano-particle composite graphene high performance lithium storage material of cathode material for lithium ion battery and cathode material (all claimed). ADVANTAGE - The pulverization and shedding of the material caused by the volume expansion of the material during the cycle is alleviated. The electrical conductivity of the material is improved. The high capacity and high cycle stability of the tin dioxide nano-particle composite graphene high performance lithium storage material are obtained. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: 1.the oxalic acid-assisted synthetic tin dioxide nano-particle composite graphene high performance lithium storage material; 2.the cathode material comprising oxalic acid-assisted synthetic tin dioxide nano-particle composite graphene high performance lithium storage material; 3.a lithium ion battery containing cathode material; and 4.a sodium ion battery containing cathode material.