Modifier of lithium ion battery and method for making the same

1. 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.

2. The method of claim 1 , wherein the phosphorous source comprises a material that is selected from the group consisting of phosphoric acid, triammonium phosphate, aluminum phosphate, ammonium dihydrogen phosphate, aluminum dihydrogen phosphate, diammonium hydrogen phosphate, dialuminum hydrogen phosphate, and combination thereof.

3. The method of claim 1 , wherein the trivalent aluminum source comprises a material that is selected from the group consisting of aluminum hydroxide, aluminum oxide, aluminum phosphate, aluminum dihydrogen phosphate, dialuminum hydrogen phosphate, and combination thereof.

4. The method of claim 1 , wherein the metallic oxide comprises a material that is selected from the group consisting of chromium trioxide, zinc oxide, copper oxide, magnesium oxide, zirconium dioxide, molybdenum trioxide, vanadium pentoxide, niobium pentoxide, tantalum pentoxide, and combination thereof.

5. The method of claim 1 , wherein the phosphorous source and the trivalent aluminum source both comprise a material that is selected from the group consisting of aluminum phosphate, aluminum dihydrogen phosphate, dialuminum hydrogen phosphate, and combination thereof.

6. The method of claim 1 , wherein the liquid phase solvent comprises a material that is selected from the group consisting of water, N-methyl-pyrrolidone, and combination thereof.

7. The method of claim 1 , wherein a total mass of the phosphate radical in the phosphorous source, the aluminum element in the trivalent aluminum source, and the metallic element in the metallic oxide divided by a volume of the modifier is in a range from about 0.02 g/ml to about 0.08 g/ml.

8. The method of claim 1 , wherein the phosphorous source is phosphoric acid, the trivalent aluminum source is aluminum hydroxide, and the metallic oxide is chromium trioxide.

9. The method of claim 1 further comprising stirring and heating the first solution after the mixing the solution of the phosphorus source having the phosphate radical with the liquid solvent.

10. The method of claim 8 , wherein a concentration of the phosphoric acid is in a range from about 60% to about 90%.

11. The method of claim 9 , wherein a heating temperature is in a range from about 60° C. to about 100° C.

12. The method of claim 10 , wherein an amount of the phosphoric acid is about 34.5 grams, an amount of the aluminum hydroxide is about 5.9 grams, and an amount of the chromium trioxide is about 2.5 grams.

13. A method for making a modifier of a lithium ion battery, the method comprising:

providing a solution of a phosphorous source having a phosphate radical;

mixing the solution of the phosphorous source having the phosphate radical with N-methyl-pyrrolidone to form a first solution;

adding a trivalent aluminum source, and a metallic oxide into the first solution to react as a clear solution.

14. The method of claim 13 , wherein the adding the trivalent aluminum source and the metallic oxide into the first solution comprises:

putting the trivalent aluminum source into the first solution to form a suspension; and

adding the metallic oxide to the suspension to react with the suspension to form the clear solution.

15. The method of claim 13 , further comprising stirring the first solution at about 80° C. during the mixing the solution of the phosphorous source having the phosphate radical with the N-methyl-pyrrolidone.

16. The method of claim 13 , 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.