Coated active material, electrode mixture, battery, and producing method

Patent metadata

Field	Value
Publication number	US-2025239594-A1
Application number	US-202519018978-A
Country	US
Kind code	A1
Filing date	Jan 13, 2025
Priority date	Jan 22, 2024
Publication date	Jul 24, 2025
Grant date	—

Abstract

A coated active material, includes: an electrode active material; and a coating layer that covers the electrode active material and contains a coating material including a B element, a P element, and an O element, wherein: a moisture amount X generated in the coated active material in a temperature range of 120° C. or more and 180° C. or less is 10.0 ppm or less; and a coverage of the coating layer with respect to the electrode active material is larger than 67%.

First claim

What is claimed is:

1 . A coated active material, comprising:
an electrode active material; and a coating layer that covers the electrode active material and contains a coating material including a B element, a P element, and an O element, wherein: a moisture amount X generated in the coated active material in a temperature range of 120° C. or more and 180° C. or less is 10.0 ppm or less; and a coverage of the coating layer with respect to the electrode active material is larger than 67%.

2 . The coated active material according to claim 1 , wherein the moisture amount X is 8.0 ppm or less.

3 . The coated active material according to claim 1 , wherein a moisture amount Y generated in the coated active material in a temperature range of 180° C. or more and 300° C. or less is 350 ppm or less.

4 . The coated active material according to claim 1 , wherein the coverage is 75% or more.

5 . The coated active material according to claim 1 , wherein the coating material further includes a Li element.

6 . The coated active material according to claim 1 , wherein:
the electrode active material includes a Li element, an M element, and an O element; M is a metal other than Li and at least includes Ni; and a molar ratio Ni/M of Ni to M is 50% or more.

7 . The coated active material according to claim 6 , wherein Ni/M is 80% or more.

8 . The coated active material according to claim 1 , wherein a BET specific surface area is 0.50 m 2 /g or more and less than 1.20 m 2 /g.

9 . An electrode mixture, comprising:
the coated active material according to claim 1 ; and at least one of an electrically conductive material and a binder.

10 . The electrode mixture according to claim 9 , wherein the electrode mixture includes a solid electrolyte.

11 . The electrode mixture according to claim 10 , wherein the solid electrolyte is a sulfide solid electrolyte.

12 . A battery comprising:
a positive electrode layer; a negative electrode layer; and an electrolyte layer disposed between the positive electrode layer and the negative electrode layer, wherein the positive electrode layer or the negative electrode layer includes the electrode mixture of claim 9 .

13 . The battery according to claim 12 , wherein the positive electrode layer includes the electrode mixture.

14 . The battery according to claim 12 , wherein the electrolyte layer includes a solid electrolyte.

15 . A producing method of producing the coated active material of claim 1 , the method comprising:
preparing the electrode active material and the coating material; and forming the coating layer by covering the electrode active material with the coating material by a dry method, wherein a particle size D 90 of the coating material is 2 μm or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kubota Masaru

Classifications

• H01M10/0562

  Solid materials · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/052

  Li-accumulators · 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

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title