▎ 摘　　要

NOVELTY - Preparing three-dimensional crosslinked composite material iron(III) nitrate/ferrous sulfide/reduced graphene oxide (Fe3O4/FeS/rGO), comprises (i) preparing deionized aqueous solutions of iron(III) nitrate nonahydrate and urotropine respectively under ultrasonic stirring conditions, and then slowly adding iron(III) nitrate solution dropwisely into the urotropine solution to obtain mixed solution I, (ii) adding sublimed sulfur and graphene oxide dispersions into the mixed solution I prepared in step (i) respectively, and ultrasonically mixing to obtain mixed solution II, (iii) pouring the mixed solution II obtained in step (ii) into the reaction kettle, slowly heating, cooling to room temperature, washing the product to neutral, and drying in oven to obtain solid product I, and (iv) calcining the solid product I obtained in step (iii) at elevated temperature under the protection of nitrogen atmosphere, cooling, and grinding the product to obtain final product. USE - The three-dimensional cross-linked composite Fe3O4/FeS/rGO is useful in preparing batteries having high reversible capacity, superior rate performance and cycle stability (claimed). ADVANTAGE - The method: solves the technical problem of volume expansion when the electrode material re-inserts lithium; and utilizes deionized water as the solvent, and the reduced graphene oxide, which has good electrical conductivity, large specific surface area and more functional groups. The conductive network structure: provides larger contact area for the electrolyte and electrode; and promotes the rapid transfer of charge and lithium(I); enables the composite material form larger space gap, and three-dimensional cross-linked composite structure; alleviates the volume expansion when the material is intercalated with lithium; and improves the electrochemical performance of the battery. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for three-dimensional crosslinked composite Fe3O4/FeS/rGO, obtained by above mentioned method.