▎ 摘　　要

NOVELTY - Method comprises (1) dissolving vanadium source compound and reducing agent compound in water, heating, stirring until the vanadium ion reduction appears green, adding sodium source compound, fluorine source compound and phosphorus source compound to obtain mixed solution, dispersing the nano-carbon material in water to obtain dispersion, mixing dispersion with the mixed solution, stirring uniformly to obtain the reaction solution, (2) performing hydrothermal reaction to obtain the initial nano-carbon material composite single-crystal fluorine-vanadium-sodium phosphate mixed solution, (3) centrifuging or filtering initial nano-carbon material composite single-crystal fluorine-vanadium-sodium phosphate mixed solution and cleaning to obtain the nano-carbon material composite single-crystal fluorine oxygen vanadium sodium precursor, (iv) drying and grinding the nano-carbon material composite single crystal fluorine oxygen vanadium sodium phosphate precursor, heating and cooling. USE - The material is useful in sodium ion battery as anode material of the material (claimed). ADVANTAGE - The material: can form carbon material-single crystal surface adhesion by nano-carbon material composite single crystal; ensures surface embedding and body-phase penetrating structure, which can improve the fluorine phosphoric acid vanadium sodium material electron/ion transport efficiency, specific capacity, circulation efficiency, rate characteristics and cycle stability. DETAILED DESCRIPTION - Preparing nano-carbon material composite single crystal fluorine oxygen vanadium sodium material comprises (1) dissolving the vanadium source compound and reducing agent compound in water, heating and stirring until the vanadium ion reduction appears green, adding sodium source compound, fluorine source compound and phosphorus source compound to obtain mixed solution, where the mol ratio of sodium, vanadium, phosphorus and fluorine element in the mixed solution is 3:2:2:(1-5), dispersing the nano-carbon material in water to obtain dispersion, mixing the dispersion with the mixed solution, stirring uniformly to obtain the reaction solution, (2) adding the reaction solution prepared in the step (1) into a hydrothermal kettle, performing hydrothermal reaction for 0.5-50 hours at 100-250°C to obtain the initial nano-carbon material composite single-crystal fluorine-vanadium-sodium phosphate mixed solution, (3) centrifuging or filtering initial nano-carbon material composite single-crystal fluorine-vanadium-sodium phosphate mixed solution at a rate of 1000-12000 revolutions/minute and cleaning to obtain the nano-carbon material composite single-crystal fluorine oxygen vanadium sodium precursor, (iv) drying and grinding the nano-carbon material composite single crystal fluorine oxygen vanadium sodium phosphate precursor, then heating to 300-800°C for 1 minute to 20 hours under argon/nitrogen atmosphere at a rate of 1-20°C/minute, then naturally cooling to room temperature. An INDEPENDENT CLAIM is also included for nano-carbon material composite single crystal fluorine oxygen vanadium sodium material, prepared by above method.