▎ 摘　　要

NOVELTY - Reducing graphene-oxide-ferrous-oxide sandwich structural complex comprises ferrous silicate nanoparticle and ferric oxide nanoparticles grown on the surface of reduced graphene forming a sandwich structure, where ferrous silicate having size is 300-400 nm, and thickness is 4-5 nm and the diameter of ferric oxide is 5-7 nm. USE - The reducing graphene-oxide-ferrous-oxide sandwich structural complex is useful as cathode electrode for lithium ion battery (claimed). ADVANTAGE - The reducing graphene-oxide-ferrous-oxide sandwich structural complex exhibits higher specific capacity, has good circulation stability, excellent multiplying power performance and provides long-life of lithium ion battery. The method is simple, requires mild reaction condition, short time and environmentally-friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene-oxide-ferrous-oxide sandwich, comprising (i) adding graphene oxide into cationic surfactant solution, stirring cation surfactant attached on the surface of graphene oxide; (ii) adding ammonia water and silicon source, stirring at least for 6 hours; (iii) washing the product, drying, obtaining silicon dioxide-graphene oxide-silica (SiO2-GO-SiO2) sandwich structure complex; (iv) adding SiO2-GO-SiO2 into de-ionized water, dispersing ultrasonically; (v) adding heptahydrate ferrous sulfate and sodium acetate trihydrate into de-ionized water and stirring; (vi) mixing the solution obtained in the step (iv) and step (v) to obtain mixed solution, stirring, adding the obtained solution into the reaction container, heating and preserving temperature and allowing to react; and (vii) washing the product and drying.