| abstract |
The present invention provides a positive electrode active material for a lithium ion secondary battery, a positive electrode, a lithium ion secondary battery, and a positive electrode active material for a lithium ion secondary battery, which are excellent in cycle characteristics and rate characteristics even when charged at a high voltage. Provide a method. Li element and at least one transition metal element selected from the group consisting of Ni, Co, and Mn (provided that the molar amount of Li element exceeds 1.2 times the total molar amount of the transition metal element) The surface of the lithium-containing composite oxide is characterized by comprising particles (II) in which oxide (I) of at least one metal element selected from the group consisting of Zr, Ti, and Al is unevenly distributed. . |