Lithium transition metal complex oxide for lithium ion secondary battery cathode active material and method for producing the same, lithium ion secondary battery cathode active material, and lithium ion secondary battery

摘要

A lithium transition metal complex oxide for a lithium ion secondary battery cathode active material contains 100 to 1000 ppm of silicon and 300 to 900 ppm of fluorine. A method for producing the lithium transition metal complex oxide includes the step of mixing a lithium compound, a transition metal compound, a fluorine compound, and a silicon compound to prepare a raw material mixture, and the step of firing the raw material mixture to produce the lithium transition metal complex oxide.