▎ 摘　　要

NOVELTY - Precursor composite for an electrode material, comprises graphene oxide with a carbon and oxygen (C:O) ratio of 2.5:3.5, and electrochemically active material (EAM) comprising a tetravalent vanadium oxohydroxide. USE - The precursor composite is useful in an electrode material of an electrochemical cell, which is useful for an alkali metal or alkali ion battery (all claimed). ADVANTAGE - The precursor composite can be economically and easily prepared using the improved amount of graphene oxide and electrochemically active materials having unique properties, and exhibits enhanced electronic conductivity property. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparing the precursor composite, comprising mixing the tetravalent vanadium oxohydroxide with an aqueous graphene oxide solution; and (2) producing an electrode material from the precursor composite comprising (a) drying the precursor composite, (b) heating the dry precursor composite to a temperature of at least 50 degrees C but below the decomposition temperature of the vanadium oxohydroxide and for a time sufficient to induce the desired reduction of the graphene oxide with respective change in the oxidation state of the transition metal in the vanadium oxohydroxide. DESCRIPTION OF DRAWING(S) - The figure shows a scanning electron microscope (SEM) image of the H4V3O8-graphene oxide composite.