▎ 摘　　要

NOVELTY - A graphene coated-silica nanotube composite preparing method, involves dispersing nanozinc oxide rod in ethanol solution, adding water, ammonia water and tetraethyl orthosilicate solution to mixture, reacting mixture, and washing and drying product. The obtained nanorod is dispersed in aqueous sodium chloride solution and polydimethyl diallyldimethylammonium chloride is added to the mixture. The modified nanorod is dispersed in aqueous graphene oxide solution. The modified nanorod is washed and dried, followed by dispersing coated-nanorod in excess acid, and washing and drying nanorod. USE - Method for preparing graphene coated-silica nanotube composite that is utilized in a cathode material of lithium-ion battery. ADVANTAGE - The method enables preparing graphene coated-silica nanotube composite with high discharge capacity, long service life and high capability. DETAILED DESCRIPTION - A graphene coated-silica nanotube composite preparing method, involves dispersing nanozinc oxide rod in ethanol solution, adding water, ammonia water and tetraethyl orthosilicate solution to the mixture, reacting the mixture at room temperature for 0.5-12 hours, and washing and drying product to obtain zinc oxide-silica core shell nanorods. The obtained nanorod is dispersed in aqueous sodium chloride solution and polydimethyl diallyldimethylammonium chloride is added to the mixture. The obtained mixture is stirred for 0.5-24 hours, washed and dried to obtain diallyldimethylammonium chloride modified-nanorod. The modified nanorod is dispersed in aqueous graphene oxide solution and stirred for 0.5-24 hours. Aqueous sodium borohydride solution is added to the modified nanorod and stirred for 0.5-24 hours. The modified nanorod is washed and dried to obtain graphene coated-nanorod, followed by dispersing the graphene coated-nanorod in excess acid, stirring the mixture for 0.5-24 hours, and washing and drying nanorod to obtain the graphene coated-silica nanotube composite.