LITHIUM COMPLEX OXIDE, MANUFACTURING METHOD THEREOF, SECONDARY BATTERY POSITIVE ELECTRODE ACTIVE MATERIAL INCLUDING LITHIUM COMPLEX OXIDE, SECONDARY BATTERY POSITIVE ELECTRODE INCLUDING POSITIVE ELECTRODE ACTIVE MATERIAL, AND LITHIUM ION SECONDARY BATTERY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a lithium complex oxide which can offer a lithium ion secondary battery having an operation voltage of a 5-V class when used as a positive electrode active material, and which can be used to obtain a lithium ion secondary battery having good cycle and rate characteristics.SOLUTION: A lithium complex oxide comprises a composition including Ni and Mn, and expressed by a particular formula. The lithium complex oxide has an average secondary particle diameter of 3-29 m, a spinel type crystal structure, and space groups, at least part of which consists of a space group P432.