Carbon coated Na3VO4 composite anode material and preparation method and application thereof

The invention provides a carbon coated Na3VO4 composite anode material and a preparation method thereof. The preparation method comprises the following steps of separately placing a sodium source, a vanadium source and hexamethylenetetramine in 10ml of distilled water, and stirring the distilled water for 40 minutes so that the sodium source, the vanadium source and the hexamethylenetetramine are fully dissolved; transferring the obtained mixed solution into a lining of a hydrothermal kettle, adding the distilled water into the linear in an amount of 80% of the volume, carrying out reaction in an air blower at 120 DEGC for 24 hours, carrying out reaction in the air blower at 180 DEG C for 24-72 hours, and naturally cooling the air blower to a room temperature to obtain a reaction liquid; and adding citric acid, sucrose or glucose into the above reaction liquid, stirring the reaction liquid to obtain an intermediate product, drying the intermediate product in a drying oven at 80 DEG C for 12 hours, and carrying out calcination in a nitrogen or argon protection atmosphere at 400-600 DEG C for 5-10 hours to obtain the carbon coated Na3VO4 composite material. The material is endowed with relatively high electrochemical performance when applied as an anode material of a sodium ion battery.