POSITIVE ELECTRODE ACTIVE MATERIAL, ALL-SOLID-STATE BATTERY AND METHOD FOR PRODUCING ALL-SOLID-STATE BATTERY

摘要

An all-solid-state battery having an olivine-type positive electrode active material and a sulfur solid electrolyte and a method for producing the all-solid-state battery is provided. The positive electrode active material is a positive electrode active material in which primary particles aggregate into secondary particles. The primary particles have an olivine-type positive electrode active material and a coating layer that coats all or a portion of the olivine-type positive electrode active material. The coating layer contains a transition metal derived from the olivine-type positive electrode active material, lithium, phosphorous and oxygen as components thereof, and the concentration of the transition metal is lower the concentration of the olivine-type positive electrode active material. A transition metal-containing sulfide region with a thickness of 10 nm or less and having sulfur and the transition metal derived from the olivine-type positive electrode active material is present on the surface of the secondary particles.

主权项

1. A positive electrode active material comprising:
primary particles; wherein, the primary particles aggregate into secondary particles;
the primary particles have an olivine-type positive electrode active material and a coating layer that coats all or a portion of the olivine-type positive electrode active material,the coating layer contains as components thereof a transition metal derived from the olivine-type positive electrode active material, lithium, phosphorous and oxygen, and a concentration of the transition metal is lower than a concentration of the olivine-type positive electrode active material, anda transition metal-containing sulfide region having a thickness of 10 nm or less is present on a surface of the secondary particles, the transition metal-containing sulfide region having sulfur and the transition metal derived from the olivine-type positive electrode active material.