CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY CONTAINING FLUORINE PHOSPHATE AND METHOD FOR PREPARING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a cathode active material for a lithium secondary battery, which has improved lifetime and stability, and a method for preparing the cathode active material.

SOLUTION: The cathode active material for a lithium secondary battery contains a compound doped or coated with a fluorine phosphate and represented by formula 1: LiaNixCoyM'zMn(1-x-y-z)O2. The cathode active material for a lithium secondary battery is prepared by adding the fluorine phosphate to a precursor compound and subjecting the obtained mixture to sintering and a heat treatment process and has improved lifetime and stability.

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