Method for making lithium battery cathode material

摘要

A method for making a lithium battery cathode material is disclosed. A mixed solution including a solvent, an iron salt material, a vanadium source material and a phosphate material is provided. An alkaline solution is added in the mixed solution to make the mixed solution have a pH value ranging from about 1.5 to 5. The iron salt, the vanadium source material and the phosphate material react with each other to form a plurality particles of iron phosphate precursor doped with vanadium which are added in a mixture of a lithium source solution and a reducing agent to form a slurry of lithium iron phosphate precursor doped with vanadium. The slurry of lithium iron phosphate precursor doped with vanadium is heat-treated.

主权项

1. A method for making a lithium battery cathode material, the method comprising:
providing a mixed solution including a solvent, an iron salt material, a vanadium source material, and a phosphate material; adding an alkaline solution in the mixed solution until the mixed solution has a pH value ranging from about 1.5 to 5 and adding a plurality of micro particles in the mixed solution; stirring the mixed solution to react the iron salt and the vanadium source material with the phosphate material to form a plurality of precursor particles of iron phosphate doped with vanadium, wherein the stirring the mixed solution comprises maintaining the plurality of micro particles in the mixed solution during reacting the iron salt and the vanadium source material with the phosphate material; providing a lithium source solution and a reducing agent, mixing the lithium source solution, the reducing agent and the plurality of iron phosphate precursor particles to form a precursor slurry of lithium iron phosphate doped with vanadium; and coating the precursor slurry of lithium iron phosphate doped with vanadium on outer surfaces of a plurality of lithium vanadium phosphate particles by following steps:
dividing the precursor slurry of lithium iron phosphate doped with vanadium into a first part, a second part, and a third part;dispersing the plurality of lithium vanadium phosphate particles in the first part to obtain a plurality of first compound particles;separating and drying the plurality of first compound particles from the first part;dispersing the plurality of first compound particles in the second part to form a plurality of second compound particles;separating and drying the plurality of second compound particles from the second part;dispersing the plurality of second compound particles in the third part; andseparating and drying the plurality of third compound particles from the third part.