▎ 摘　　要

NOVELTY - Preparing lithium-ion battery anode material iron(II,III) oxide/reduced graphene oxide sandwich structure comprises e.g. adding graphene oxide into mixture of deionized water and solvent, adding soluble divalent iron salt, then adding ammonia in a concentration of 10.0 mol/l dropwise, stirring until the concentration of ammonia is 0.01-0.5 mol/l, and stirring for 10-30 minutes, mixing in ultrasonic generator, evaporating, washing with deionized water, drying, calcining at 200-600 degrees C for 0.5-8 hours, and then cooling to room temperature to obtain final product. USE - The method is useful for preparing lithium-ion battery anode material iron(II,III) oxide/reduced graphene oxide sandwich structure. ADVANTAGE - The method has simple preparation processes, utilizes cheaply available raw materials, and low cost; and has excellent purity. DETAILED DESCRIPTION - Preparing lithium-ion battery anode material iron(II,III) oxide/reduced graphene oxide sandwich structure comprises (i) adding graphene oxide into mixture of deionized water and solvent, and mixing to obtain to suspension A having a concentration of 0.5-2 mg/ml, (ii) adding soluble divalent iron salt into suspension A obtained in step (i), and stirring to obtain mixture B having a ferrous ion concentration of 0.01-0.5 mol/l, (iii) adding ammonia in a concentration of 10.0 mol/l into mixture B obtained in step (ii) dropwise, stirring until the concentration of ammonia in the mixture B is 0.01-0.5 mol/l, and then stirring for 10-30 minutes to obtain mixed solution C, (iv) mixing mixed liquid C obtained in step (iii) in ultrasonic generator to obtain mixed liquid D, (v) evaporating mixed solution D obtained in step (iv) to obtain precursor E, and (vi) washing precursor E obtained in step (v) with deionized water, drying, calcining at 200-600 degrees C for 0.5-8 hours, and then cooling to room temperature to obtain final product.