Positive electrode active material composite for lithium ion secondary battery or positive electrode active material composite for sodium ion secondary battery, secondary battery using these, and production method thereof

摘要

A positive electrode active material composite for a lithium ion secondary battery or a sodium ion secondary capable of effectively improving high temperature cycle characteristics when used as a positive electrode active material of a lithium ion secondary battery or a sodium ion secondary battery A positive electrode active material composite for a battery is provided. Lithium composite oxidation comprising one or more lithium composite oxide particles represented by the following formula (I): LiNiaCobMncM1xO2 (I) or the following formula (II): LiNidCoeAlfM2yO2 (II) The specific lithium-based polyanion particles (B) and the lithium composite oxide particles are complexed only on the surface of the product secondary particles (A). Under specific conditions, the lithium composite oxide secondary particles (A) The positive electrode active material composite for a lithium ion secondary battery, wherein the mass ratio ((A) :( B)) of the content and the content of the lithium-based polyanion particles (B) is 95: 5-55: 45. [Selection figure] None