Coated positive electrode active material for lithium secondary batteries and lithium secondary battery

Abstract

A coated positive electrode active material for lithium secondary batteries includes a positive electrode active material, and a coating layer disposed on a surface of the positive electrode active material. The coating layer includes niobium atoms. When peaks observed at a niobium (Nb)—L3 absorption edge of an X-ray absorption fine structure spectrum of the coated positive electrode active material measured by X-ray absorption fine structure spectroscopy (XAFS) are designated as a peak A, a peak B, and a peak C in an order from lower absorption energy, a difference between absorption energy at a peak top of the peak A and absorption energy at a peak top of the peak C is 12.9 eV or greater.

Dependencies are inferred from the claim text.