Patent ID: 8455139

Claim:
A method for making a lithium battery cathode composite material, the method comprising: providing a plurality of lithium vanadium phosphate particles; and forming a lithium iron phosphate layer on an outer surface of each lithium vanadium phosphate particle, wherein the forming the lithium iron phosphate layer on the outer surface of each lithium vanadium phosphate particle comprises: M2a: providing a lithium iron phosphate precursor slurry and dividing the lithium iron phosphate precursor slurry into a first part, a second part, and a third part; M2b: dispersing the lithium vanadium phosphate particles in the first part of the lithium iron phosphate precursor slurry, and coating the outer surfaces of each of the lithium vanadium phosphate particles with the lithium iron phosphate precursor slurry; M2c: separating the lithium vanadium phosphate particles coated with the lithium iron phosphate precursor slurry from the first part lithium iron phosphate precursor slurry, and drying the lithium vanadium phosphate particles coated with the lithium iron phosphate precursor slurry to form a plurality of first compound particles; M2d: dispersing the first compound particles in the second part of the lithium iron phosphate precursor slurry, and repeating steps M2b and M2c to form a plurality of second compound particles; and M2e: dispersing the second compound particles in the third part of the lithium iron phosphate precursor slurry, and repeating steps M2b and M2c to form a plurality of compound precursor particles.