▎ 摘　　要

NOVELTY - Preparing graphene oxide-graphene composite structure involves dissolving graphene oxide in water through ultrasonic processing to obtain uniformly dispersed graphene oxide suspension as the first suspension. The analytically pure soluble iron salt and carbon source are added into de-ionized water. The reaction mixture is stirred until iron salt is fully dissolved and added into first suspension to obtain a mixed solution where concentration of iron salt is 0.05-0.5 moles/L, concentration of carbon source is 1-10 mg/L and concentration of graphene oxide us 05-2.5 mg/L. USE - Method for preparing graphene oxide-graphene composite structure used as cathode material of lithium ion battery (claimed). ADVANTAGE - The method enables to prepare graphene oxide-graphene composite structure in simple manner which is easy to realize. DETAILED DESCRIPTION - Preparing graphene oxide-graphene composite structure involves dissolving graphene oxide in water through ultrasonic processing and uniformly dispersed graphene oxide suspension as the first suspension. The analytically pure soluble iron salt and carbon source are added into de-ionized water. The reaction mixture is stirred until iron salt is fully dissolved and added into first suspension to obtain a mixed solution where concentration of iron salt is 0.05-0.5 moles/L, concentration of carbon source is 1-10 mg/L and concentration of graphene oxide us 05-2.5 mg/L. The mixed solution is added and heated in water bath and evaporated to obtain precursor. The precursor undergoes pyrolytic reaction to obtain ferric oxide graphene oxide which is loaded on surface to obtain a product which is mixed with toluene followed by the addition of (3-aminopropyl)trimethoxysilane. The volume ratio of toluene and (3-aminopropyl)trimethoxysilane is 50:(0.1-1). The resulting mixture is refluxed to obtain aminopropyl trimethoxy silane modified ferric oxide/graphene oxide. The graphene oxide is dissolved in water to obtain graphene oxide suspension in which the aminopropyl trimethoxy silane modified ferric oxide/graphene oxide is added in mass ratio of 10-20:1 and ultrasonically processed. The reaction mixture is stirred and hydrazine hydrate is added, washed and dried to obtain desired product.