| 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 method for producing 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. Containing lithium compound and at least one transition metal element selected from the group consisting of Ni, Co and Mn (provided that the molar amount of the Li element is 1.2 times or more the total molar amount of the transition metal element) (II) in which an oxide (I) of at least one kind of metallic element selected from the group consisting of Zr, Ti and Al is unevenly distributed on the surface of the oxide. |