POSITIVE ELECTRODE ACTIVE MATERIAL COMPOSITE FOR LITHIUM ION SECONDARY BATTERY OR POSITIVE ELECTRODE ACTIVE MATERIAL COMPOSITE FOR SODIUM ION SECONDARY BATTERY, SECONDARY BATTERY INCLUDING THE SAME, AND METHOD OF MANUFACTURING THE SAME

摘要

To provide a positive electrode active material composite for a lithium ion secondary battery or a positive electrode active material composite for a sodium ion secondary battery, capable of effectively improving high-temperature cycle characteristics when being used as a positive electrode active material for a lithium ion secondary battery or a sodium ion secondary battery.SOLUTION: In a positive electrode active material composite for a lithium ion secondary battery, a lithium composite oxide particle and a lithium ion conductor particle (B) are compounded on a surface of a lithium composite oxide secondary particle (A) that comprises a lithium composite oxide particle represented by the following formula (I): LiNiCoMnMO...(I), or the following formula (II): LiNiCoAlMO...(II). In the positive electrode active material composite, the mass ratio ((A):(B)) of the content of the lithium composite oxide secondary particle (A) and the content of the lithium ion conductor particle (B) is 90:10-65:35.SELECTED DRAWING: None