Composite Particle, Positive Electrode, All-Solid-State Battery, and Method of Producing Composite Particle

Patent metadata

Field	Value
Publication number	US-2024021797-A1
Application number	US-202318220378-A
Country	US
Kind code	A1
Filing date	Jul 11, 2023
Priority date	Jul 14, 2022
Publication date	Jan 18, 2024
Grant date	—

Abstract

A composite particle comprising: a positive electrode active material particle; and a coating film, wherein the coating film covers at least part of a surface of the positive electrode active material particle, and the coating film includes fluorine and at least one selected from the group consisting of phosphorus and a glass network forming element.

First claim

What is claimed is:

1 . A composite particle comprising:
a positive electrode active material particle; and a coating film, wherein the coating film covers at least part of a surface of the positive electrode active material particle, and the coating film includes fluorine and at least one selected from the group consisting of phosphorus and a glass network forming element.

2 . The composite particle according to claim 1 , wherein the glass network forming element is at least one selected from the group consisting of boron, silicon, nitrogen, sulfur, germanium, and hydrogen.

3 . The composite particle according to claim 1 , wherein a relationship of the following expression (1) is satisfied:
C F /(C P +C Z )≤0.2  (1)
where each of C F , C P , and C Z represents an element concentration measured by X-ray photoelectron spectrometry, C F represents an element concentration of fluorine, C P represents an element concentration of phosphorus, and C Z represents an element concentration of the glass network forming element.

4 . The composite particle according to claim 1 , wherein
the coating film further includes a metallic element, and the metallic element is at least one selected from the group consisting of aluminum, titanium, and zirconium.

5 . A positive electrode comprising:
the composite particle according to claim 1 ; and a sulfide-based solid electrolyte.

6 . An all-solid-state battery comprising the positive electrode according to claim 5 .

7 . A method of producing a composite particle, the method comprising:
(a) preparing a mixture by mixing a coating liquid and a positive electrode active material particle; and (b) producing a composite particle by drying the mixture, wherein the coating liquid includes a solute and a solvent, and the solute includes fluorine and at least one selected from the group consisting of phosphorus and a glass network forming element.

8 . The method of producing a composite particle according to claim 7 , wherein
the coating liquid further includes a metallic element, and the metallic element is at least one selected from the group consisting of aluminum, titanium, and zirconium.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kubota Masaru
• Miki Hidenori

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title