▎ 摘　　要

NOVELTY - The method for preparing hollow nano-silica ball/graphene composite anode material, involves dissolving polyvinylpyrrolidone in water, dripping ammonia concentration, adding cetyltrimethylammonium bromide, stirring to obtain mixed solution, adding n-ethyl silicate to ethanol, adding ethyl orthosilicate to ethanol, vigorously stirring, adding mixed solution, stirring in oil bath, freeze-drying to obtain silica precursor powder, heating to obtain silica, mixing small sized hollow silica precursor/graphene composite and magnesium powder to obtain final product. USE - Method for preparing hollow nano-silica ball/graphene composite anode material of lithium ion battery. DETAILED DESCRIPTION - Method for preparing hollow nano-silica ball/graphene composite anode material, involves (1) dissolving polyvinylpyrrolidone in water to prepare solution with molar concentration of 0.01-1 mmol/L, dripping 0.001-1 mol/L concentration of ammonia to obtained solution, adding 0.001-0.1 mol/L cetyltrimethylammonium bromide, stirring to obtain mixed solution, (2) adding n-ethyl silicate to ethanol to form solution with molar concentration of 0.01-1 mol/L, adding ethyl orthosilicate to ethanol to prepare solution with molar concentration of 0.01-1 mol/L, vigorously stirring, adding mixed solution, stirring for 3-10 hours in oil bath, (3) freeze-drying to obtain silica precursor powder, heating at 550 degrees C for 5 hours to obtain silica, ultrasonically dispersing and freeze drying to obtain small sized hollow silica precursor/graphene oxide composite material, mixing small sized hollow silica precursor/graphene composite and magnesium powder in ratio of 1:1-3, heating in an inert atmosphere to obtain hollow nano-silica ball/graphene composite, (4) removing magnesium oxide or excess magnesium powder by pickling hydrochloric acid, removing unreacted silica, centrifuging the sediment and drying to obtain final product. The molar ratio of ethyl orthosilicate to ammonia is 1:0.01-10. The mass ratio of cetyltrimethylammonium bromide to silica is 1:0.01-10. The mass ratio of silica and 0.01-5 mg/mL graphene oxide solution is 1:0.1-10.