Method of Producing Positive Electrode Active Material, Positive Electrode Active Material, and All-Solid-State Battery

Patent metadata

Field	Value
Publication number	US-2024243262-A1
Application number	US-202418404465-A
Country	US
Kind code	A1
Filing date	Jan 4, 2024
Priority date	Jan 18, 2023
Publication date	Jul 18, 2024
Grant date	—

Abstract

A method of producing a positive electrode active material comprises the following (a) and (b): (a) preparing a slurry by dispersing an active material particle in a coating liquid; and (b) performing spray drying to dry the slurry to produce a positive electrode active material. The active material particle includes an O2-type layered oxide. The coating liquid includes a solute and a solvent. The solute includes at least one selected from the group consisting of Nb, P, and B. The slurry has a solid concentration of more than 42% and not more than 51%.

First claim

What is claimed is:

1 . A method of producing a positive electrode active material, comprising:
(a) preparing a slurry by dispersing an active material particle in a coating liquid; and (b) performing spray drying to dry the slurry to produce a positive electrode active material, wherein the active material particle includes an O2-type layered oxide, the coating liquid includes a solute and a solvent, the solute includes at least one selected from the group consisting of Nb, P, and B, and the slurry has a solid concentration of more than 42% and not more than 51%.

2 . The method of producing a positive electrode active material according to claim 1 , wherein
the coating liquid further includes a surfactant, and the surfactant includes at least one selected from the group consisting of polyether-modified silicone and polyethylene glycol alkyl ether.

3 . A positive electrode active material comprising:
an active material particle; and a coating film, wherein the active material particle includes an O2-type layered oxide, the coating film covers at least part of a surface of the active material particle, the coating film includes at least one selected from the group consisting of Nb, P, and B, the coating film has a thickness of 4 nm or more, a covering rate which is a rate at which the surface of the active material particle is covered with the coating film is 80% or more, and the covering rate is measured by X-ray photoelectron spectrometry.

4 . The positive electrode active material according to claim 3 , wherein the positive electrode active material has a D10 of 3 μm or less in volume-based particle size distribution.

5 . The positive electrode active material according to claim 3 , wherein the positive electrode active material has a D90 of 15 μm or less in volume-based particle size distribution.

6 . An all-solid-state battery comprising the positive electrode active material according to claim 3 and a sulfide solid electrolyte.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kubota Masaru
• Yubuchi So

Classifications

• C01G53/50 Primary

  of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2 · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/48

  of inorganic oxides or hydroxides · CPC title

• H01M4/366 Primary

  as layered products · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title