The invention discloses a method for preparing fluorizated
lithium vanadium phosphate as a
lithium-
ion battery
anode material by using a
spray pyrolysis method. The preparation method comprises the following steps of: respectively adding a
phosphate source, a
vanadium source, a
lithium source, a
fluorine source, hydrazine
hydrate and additives in a certain stoichiometric proportion to water, stirring for 30min to uniformly mix after adding each substance, and finally, forming a
mixed solution with the
metal ion concentration of 0.2-1.0mol / L; then, putting the
mixed solution in a
hydrogen airflow spray dryer, spraying and
drying at 200-300 DEG C and collecting the product to obtain precursor
powder; and tabletting the precursor
powder at the pressure of 20MPa, then,
sintering at 600-800 DEG C for 10h under
hydrogen protection and naturally cooling to a
room temperature to obtain LiVPO4F. The method has low
raw material cost, simple operation process, strong
controllability and high
reproduction, effectively shortens the
synthesis period of the material and saves the production cost. The fluorizated lithium
vanadium phosphate synthesized by applying the method has the grain
diameter of 60-500nm, good grain dispersibility, high
crystallinity degree, higher reversible capacity and favorable cycle life, can meet various needs of the practical applications of the lithium-
ion battery and can be directly used for the
mass production of the lithium-ion battery
anode material.