▎ 摘　　要

NOVELTY - Modifying activated carbon material comprises (i) dissolving the alkaline substance in deionized water to obtain an alkaline solution; (ii) dissolving the oxidizing substance in the alkali solution at normal temperature to obtain alkaline chemical oxidation etching solution; (iii) soaking the carbon material in the alkaline chemical oxidation etching solution for 1-24 hours at 20-80℃, modifying and activating; and (iv) washing the modified activated carbon material by deionized water and drying. USE - The method is useful for modifying activated carbon material is useful in preparing electrode material of energy storage device, preferably alkali metal secondary battery, a supercapacitor or a flow battery (all claimed). ADVANTAGE - The method prepares modified activated carbon material with high specific surface area, good hydrophilic performance, and good electrochemical performance; is simple to operate; and provides mild reaction condition and low energy consumption. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for modified activated carbon material, prepared as mentioned above.