DOPED SODIUM-VANADIUM PHOSPHATE, ITS PREPARATION METHOD AND ITS USE

Abstract

The present invention relates to the technical field of sodium-ion batteries. The invention concerns a doped sodium-vanadium phosphate, its method of preparation, and its use. The steps for preparing a nitrogen-doped peony-shaped molybdenum oxide from the raw materials of the doped sodium-vanadium phosphate include: adding a regulator to a molybdenum-containing solution for a reaction, and subjecting it to concentration and heat treatment to obtain a peony-shaped molybdenum oxide; dissolving the peony-shaped molybdenum oxide in a regulator, then adding an amine source and allowing it to stand, centrifuging and washing it, and subjecting it to heat treatment to obtain the product. The nitrogen-doped peony-shaped molybdenum oxide of the present invention is prepared by adding a regulator and is doped in sodium-vanadium phosphate, so that the sodium-vanadium phosphate is rich in sodium-ion binding sites and has a stable structure, the contact range between the sodium-vanadium phosphate and an electrolyte can be extended, the sodium storage sites of the synthesized sodium-vanadium phosphate are also increased accordingly; in addition, the sodium ion diffusion path is shortened, and the sodium ion disintercalation rate during charging and discharging is improved.