NOVELTY - A slurry mixture is obtained using polymer material by wet mixing method or dry mixing method. Obtained slurry mixture is heated at more than boiling point of solvent, and solvent is completely evaporated, to obtain dry mixture. Dry mixture is subjected to grinding or milling, to obtain uniform mixture of particles. Resultant material is heated primarily under inert atmosphere, and then at 800-1000 degrees C for 2-10 hours to obtain metal polyanion compound or mixed metal polyanionic compound. Obtained product is cooled, crushed and sieved to obtain lithium vanadium phosphate.    USE - Preparation of lithium vanadium phosphate used as cathode material for lithium ion battery.    ADVANTAGE - The method efficiently provides lithium vanadium phosphate having high electrical conductivity, cycle characteristics and capacity.    DETAILED DESCRIPTION - A slurry mixture is obtained by wet mixing method or dry mixing method. The wet mixing method is carried out by adding polymer material to a solvent (a), wet mixing for 10 minutes to 5 hours until the polymer is dissolved, adding polyanionic compound, continuously stirring for 2 minutes to 5 hours, adding metal ion and stirring for 2 minutes to 5 hours. Dry mixing method is carried out by mixing polymer material, solvent, and polyanion source or alkali metal polyanion compound, for 4 minutes to 16 hours, preferably for 30 minutes to 2 hours. The obtained slurry mixture is heated at more than the boiling point of solvent, and the solvent is completely evaporated, to obtain dry mixture. The resultant dry mixture is subjected to grinding or milling for 4-24 hours, to obtain uniform mixture of particles. The resultant material is heated primarily under inert atmosphere at 300-400 degrees C for 1-4 hours for 2 degrees C/minute, and then at 800-1000 degrees C for 2-10 hours at the rate of 2-5 degrees C/minute to obtain metal polyanion compound or mixed metal polyanionic compound of formula: Li3V2(PO4)3 or Li3V2-xMx(PO4)3. The obtained product is then cooled to room temperature at the rate of 2-3 degrees C/minute, crushed with hammer mill, and sieved to obtain lithium vanadium phosphate.