Positive electrode active material for all-solid lithium ion batteries, positive electrode for all-solid lithium ion batteries, all-solid lithium ion battery, and method for producing positive electrode active material for all-solid lithium ion batteries

Abstract

A positive electrode active material for all-solid lithium ion batteries including a core positive electrode active material particle and a coating layer, the core positive electrode active material particle being represented by a composition shown in the following formula (1): LiaNibCocMndOe  (1) in which formula (1), 1.0≤a≤1.05, 0.8≤b≤0.9, 1.8≤e≤2.2, b+c+d=1; wherein the coating layer is an oxide of Li and Nb, and a specific surface area X (m2/g) of the positive electrode active material and a Nb content Y (mass %) in the positive electrode active material satisfy a relationship of the following formula (2): 0.65≤Y/X≤1.20  (2).

Dependencies are inferred from the claim text.