Preparation method and application of oxygen-enriched functional group carbon material

The invention belongs to the technical field of electrochemistry and energy materials, discloses a preparation method and application of an oxygen-enriched functional group carbon material, and particularly relates to a preparation method of a carbon material for a sodium ion battery. Commercial activated carbon is used as a raw material, and nitric acid treatment and low-temperature oxidation calcination treatment in air are utilized to obtain the oxygen-enriched functional group carbon material. The introduction of an oxygen functional group not only improves the conductivity of the carbon material and the wettability of the carbon material to an electrolyte, but also enhances the sodium ion adsorption and desorption capability of the carbon material, and a reversible oxidation-reduction reaction is carried out, so that the sodium storage capability of the carbon material is remarkably improved. The experimental method is simple and easy to operate, the experimental raw materials are cheap and easy to obtai