Positive electrode active material and secondary battery

Abstract

A positive electrode active material includes: center cores containing a composite oxide containing alkali metal or alkali earth metal; and eutectic layers containing a eutectic substance composed of at least two types of composite oxides containing the alkali metal or the alkali earth metal and configured to cover the center cores. Preferably, the eutectic layers have a thickness of 4 nm or larger and 800 nm or smaller. The composite oxides forming the eutectic substance include the composite oxide of the center cores.

Dependencies are inferred from the claim text.