POSITIVE ELECTRODE ACTIVE MATERIAL FOR ALL-SOLID LITHIUM ION BATTERY, POSITIVE ELECTRODE FOR ALL-SOLID LITHIUM ION BATTERY, AND ALL-SOLID LITHIUM ION BATTERY

摘要

Provided is a positive electrode active material for all-solid lithium ion batteries, which exhibits good output characteristics and cycle characteristics when applied to all-solid lithium ion batteries. The positive electrode active material for all-solid lithium ion batteries includes: a core positive electrode active material having a composition represented by the following formula: LiaNibCocMdO2in which M is at least one element selected from Mn, V, Mg, Ti and Al, 1.00 ≤ a ≤ 1.02, 0.8 ≤ b ≤ 0.9, and b + c + d = 1; and a coated portion formed on a surface of the core positive electrode active material, wherein the coated portion is an oxide comprising Li and Nb, and at least one transition metal having higher valency than that of Nb.