| abstract |
[Task] Provides a positive electrode active material for a lithium secondary battery that can give excellent cycle characteristics to a lithium secondary battery composed of a lithium composite oxide, a method of industrially advantageously manufacturing such a positive electrode active material for a lithium secondary battery, and a lithium secondary battery having excellent cycle characteristics using the same. It is. [Resolution] General formula (1): Li x Ni 1- y- z Co y M z O 2 (1) (wherein x is 0.98 ≦ x ≦ 1.20, y is 0 <y ≦ 0.5, and z is 0 <). z ≤ 0.5, wherein y + z <1. M is at least one element other than Li, Ni, and Co.), and is a composite particle composed of a lithium composite oxide and LiTiO 2 . Cathode active material for lithium secondary battery. |