Manufacturing method of recycled positive electrode active material

Abstract

Provided is a technique to recover a capacity of a degraded positive electrode active material and to reduce a response resistance increased by the degradation without using a means for baking. A manufacturing method disclosed herein includes polishing the positive electrode active material. The positive electrode active material includes a core particle having a layered crystal structure and includes a coating part having a rock salt crystal structure on a surface of the core particle. A ratio (IB/IA) of a peak strength IA at 8341 eV on a nickel (Ni)—K absorption edge measured by a XAFS analysis on the positive electrode active material before the polishing and a peak strength IB at the 8341 eV on the nickel (Ni)—K absorption edge measured by the XAFS analysis on the positive electrode active material after the polishing becomes equal to or less than 0.7.

Dependencies are inferred from the claim text.