Positive Electrode Active Material and Method for Producing the Same

Abstract

A positive electrode active material includes a lithium transition metal oxide in the form of a single particle; and a coating part which is formed on the surface of the lithium transition metal oxide and contains cobalt. The lithium transition metal oxide in the form of a single particle has interfaces divided into a strong boundary having collapse of a layered structure in a crystal particle and a weak boundary having no collapse of the layered structure. The coating part is formed only at the strong boundary among the interfaces. A method for producing the positive electrode active material is also provided.

Dependencies are inferred from the claim text.