Method for preparing sodium fluorine vanadium phosphate material in air atmosphere

The invention discloses a method for preparing a sodium fluorine vanadium phosphate material in air atmosphere. The method comprises the following steps of enabling a vanadium source, a phosphate source and a carbon source to be mixed, or enabling the vanadium source and the phosphate source to be mixed and grinded; then performing calcining and sintering in argon atmosphere; cooling to the room temperature and grinding to obtain vanadium phosphate; adding the vanadium phosphate, a fluorine source and a sodium source into deionized water separately and performing magnetic stirring, moving the mixture into a high-pressure reaction kettle to be subjected to hydrothermal reaction; next, naturally cooling the reaction kettle to the room temperature, taking the mixture out, and performing water bath drying; taking the product out and carrying out grinding and tabletting, and performing calcining and sintering in the air atmosphere; and then performing furnace cooling to the room temperature and grinding to obtain the product which is sodium fluorine vanadium phosphate. The prepared sodium fluorine vanadium phosphate material is uniform in grain diameter distribution, high in purity, and high in rate capability and cycling performance.