▎ 摘　　要

NOVELTY - Preparing graphene-iron oxide-hydroxide nanocrystalline lithium ion battery anode material under in situ growth condition comprises e.g. (i) adding graphene oxide into deionized water and mixing to obtain suspension, (ii) adding the soluble divalent iron salt to the suspension to obtain mixture having a ferrous ion concentration of 0.01-0.5 mol/l, stirring and adjusting the pH to 3-5 to obtain precursors, (iii) pouring the precursor into hydrothermal reactor and sealing the reactor, then raising the reaction temperature to 70-150 degrees C for 6-12 hours, washing and drying. USE - The method is useful for preparing graphene-iron oxide-hydroxide nanocrystalline lithium ion battery anode material under in situ growth condition (claimed). ADVANTAGE - The graphene-iron oxide-hydroxide nanocrystalline lithium ion battery anode material improves the conductivity. DETAILED DESCRIPTION - Preparing graphene-iron oxide-hydroxide nanocrystalline lithium ion battery anode material under in situ growth condition comprises (i) adding graphene oxide into deionized water and mixing to obtain the suspension having a concentration of 0.5-2 mg/ml, (ii) adding the soluble divalent iron salt to the suspension to obtain mixture having a ferrous ion concentration of 0.01-0.5 mol/l, stirring the resulting mixture for 10-60 minutes, and then adjusting the pH to 3-5 to obtain the precursors, (iii) pouring the precursor into hydrothermal reactor and sealing the reactor, then reacting at 40-60 degrees C for 30-60 minutes, then raising the reaction temperature to 70-150 degrees C for 6-12 hours, washing and drying at room temperature to obtain final product.