Patent ID: 8163193

Claim:
A method for making a modifier of a lithium ion battery, the method comprising: Providing a solution of a phosphorus source having a phosphate radical; mixing the solution of the phosphorus source having the phosphate radical with a liquid solvent to form a first solution; putting a trivalent aluminum source into the first solution to form a suspension; and adding a metallic oxide to the suspension to react with the suspension to form a clear solution; wherein a molar ratio of the trivalent aluminum source, the metallic oxide and the phosphorous source is set by (Mol Al +Mol Metal ): Mol p =about 1:2.5 to about 1:4, Mol Al is the amount of substance of an aluminum element in the trivalent aluminum source, Mol Metal is the amount of substance of an metallic element in the metallic oxide, and Mol p is the amount of substance of an phosphorous element in the phosphorous source.