▎ 摘　　要

NOVELTY - Preparing potassium vanadate/reduced graphene electrode material comprises (i) stirring potassium chloride, potassium iodide, vanadium pentoxide, deionized water and graphene oxide at room temperature to obtain mixed solution A, and (ii) hydrothermally reacting mixed solution A at specific temperature for period of time, cooling and removing impurities to obtain potassium vanadate/reduced graphene electrode material. USE - The method is useful for preparing potassium vanadate/reduced graphene electrode material. ADVANTAGE - The method: adopts vanadium-based compounds to replace cobalt-based compounds in battery electrodes, which greatly saves production cost of batteries. The electrode material has excellent electrochemical performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing potassium vanadate/reduced graphene film electrode, comprising attaching potassium vanadate/reduced graphene electrode material attached to current collector by vacuum suction filtration, to obtain potassium vanadate/reduced graphene film electrode; and (2) potassium ion battery, comprising anode, where the anode is potassium vanadate/reduced graphene film electrode; (3) lithium ion battery, comprising anode, where the anode is potassium vanadate/reduced graphene film electrode; and (4) sodium ion battery, comprising anode, where the anode is potassium vanadate/reduced graphene film electrode.