▎ 摘　　要

NOVELTY - Adjusting and controlling orifice of porous carbon material, comprises (i) slowly adding strong acid and strong oxidizing solid to porous carbon precursor in turn under ice-water bath conditions, and stirring uniformly to obtain initial oxidation reaction solution; (ii) increasing temperature of water bath to medium temperature, slowly dropwise adding deionized water to the initial oxidation reaction solution to obtain intermediate oxidation reaction solution; (iii) continuously increasing the temperature of the water bath to the first final temperature, stirring intermediate oxidation reaction solution, and obtaining the final oxidation reaction solution; and (iv) adding final oxidation reaction solution to post-treatment solution, filtering while hot, rinsing with dilute acid and deionized water, and drying to obtain oxidized porous carbon material. USE - The porous carbon material is used as cathode material for sodium ion battery. ADVANTAGE - The method: can achieves active control of the pore size of the porous carbon precursor, obtains a porous carbon material with reduced pore size (less than 0.4 nm) and maintains the intrinsic pore volume and rich pore structure. The porous carbon material: can significantly improves the sodium storage capacity and energy density, and accelerates the commercialization of sodium-ion batteries.