▎ 摘　　要

NOVELTY - Preparing graphene oxide nano composite material involves taking ethanol as solvent of rare earth solution, where the rare earth solution comprises 0.05-5.0 % rare earth compound, 0.1-2.0 % ammonium chloride, 0.01-2.0 % urea and 0.1-0.4 % triethanolamine. The rare earth solution is heated on water bath, then the pH of the rare earth solution is adjusted to 5-6 to obtain the rare earth modified solution. The 200-500 milligram/mL of oxidized graphene is added into the rare earth modified solution and ultrasonicaly dispersed at 18-22 degrees C to obtain the modified graphene oxide dispersion liquid. USE - Method for preparing graphene oxide nano composite material for lithium ion battery (claimed). ADVANTAGE - The method enables to prepare graphene oxide nano composite material which improves the surface structure of graphene, reduces the agglomeration of graphene, improves the capacitor performance of the nano copper oxide/graphene electrode material. It effectively solves problems of existing technology which are copper oxide/graphene electrode conductivity difference, easily broken, large discharging volume change and poor cycle performance. DETAILED DESCRIPTION - Preparing graphene oxide nano composite material involves taking ethanol as solvent of rare earth solution, where the rare earth solution comprises 0.05-5.0 % rare earth compound, 0.1-2.0 % ammonium chloride, 0.01-2.0 % urea and 0.1-0.4 % triethanolamine. The rare earth solution is heated on water bath, then the pH of the rare earth solution is adjusted to 5-6 to obtain the rare earth modified solution. The 200-500 milligram/mL of oxidized graphene is added into the rare earth modified solution and ultrasonicaly dispersed at 18-22 degrees C to obtain the modified graphene oxide dispersion liquid. The cupric acetate monohydrate is mixed with deionized water, magnetically stirred for 10-30 minutes until dissolves completely to obtain copper acetate solution with mass concentration of 8-15%. The obtained copper acetate solution is magnetically stirred, then aqueous ammonia is slowly dropped to generate copper ammonia solution, and the pH of the copper ammonia solution is adjusted to 8-10. The modified graphene oxide dispersion liquid and copper ammonia solution are mixed according to the mass ratio of 1:2-1:5, magnetically stirred for 1-3 hours and then ultrasonically treated. The obtained solution is added in the reaction kettle and heated at 120-200 degrees C constant temperature for 8-12 hours, then naturally cooled to 18-22 degrees C, taken out the sample and washed with de-ionized water for multiple times until the pH of the waste liquid is neutral. The obtained solid is dried in a vacuum oven to obtain the desired product.