▎ 摘　　要

NOVELTY - Preparing ammonium vanadate/graphene composite cathode material comprises e.g. (i) dissolving ammonium metavanadate in deionized water, (ii) dissolving the graphene oxide in deionized water, stirring, and ultrasonic dispersing solution , (iii) mixing the solutions, adjusting pH to obtain solution, (iv) placing the solution in a reaction kettle, heating, and then naturally cooling, and (v) centrifuging the suspension to obtain powder product, soaking in deionized water and absolute ethanol, then drying, and cooling. USE - The composite cathode material is useful in lithium ion batteries (claimed). ADVANTAGE - The composite cathode material promotes insertion and extraction of lithium ion, solves disadvantages of ammonium trivanadate hemihydrate bad conductivity, enhances electrochemical properties of material, has simple preparation method and is easy to realize. DETAILED DESCRIPTION - Preparing ammonium vanadate/graphene composite cathode material comprises (i) dissolving ammonium metavanadate in deionized water to obtain ammonium metavanadate solution A containing ammonium in a concentration of .05-0.15 mol/l, (ii) dissolving the graphene oxide in deionized water, placing in a 25-40 degrees C water bath, stirring, and ultrasonic dispersing to obtain 0.2-1 g/l graphene oxide solution B, (iii) mixing the A solution and the B solution, adjusting pH to 2-6 to obtain solution C, (iv) placing the solution C in a reaction kettle, then placing the reactor in a hydrothermal synthesis reactor, heating from room temperature to 120-170 degrees C for 120-180 minutes, and then naturally cooling to room temperature, and (v) centrifuging the suspension in the reaction vessel to obtain powder product, soaking in deionized water and absolute ethanol, then drying, and cooling to obtain ammonium vanadate/graphene composite cathode material. An INDEPENDENT CLAIM is also included for ammonium vanadate/graphene composite cathode material is prepared by above mentioned method, where the ammonium vanadate/graphene structure has a rod type morphology of ammonium trivanadate hemihydrate distribution in graphene layer, and the diameter of ammonium trivanadate hemihydrate is 40-80 nm.