Coated active material, electrode mixture, battery, and coat solution

Patent metadata

Field	Value
Publication number	US-2025239595-A1
Application number	US-202519032797-A
Country	US
Kind code	A1
Filing date	Jan 21, 2025
Priority date	Jan 23, 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, 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; a molar ratio (Ni/M) of Ni to M is 80% or more; the coating layer includes a B element, a P element, a La element, and an O element; and a molar ratio (La/P) of the La element to the P element is 0.005 or more and 0.15 or less.

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, 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; a molar ratio (Ni/M) of Ni to M is 80% or more; the coating layer includes a B element, a P element, a La element, and an O element; and a molar ratio (La/P) of the La element to the P element is 0.005 or more and 0.15 or less.

2 . The coated active material according to claim 1 , wherein La/P is 0.01 or more and 0.11 or less.

3 . The coated active material according to claim 1 , wherein a molar ratio (B/P) of the B element to the P element is 0.5 or more and 2.0 or less.

4 . The coated active material according to claim 1 , wherein a coverage of the coating layer with respect to the electrode active material is 75% or more.

5 . The coated active material according to claim 1 , wherein M further includes at least one type among Co, Mn, and Al.

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

7 . The electrode mixture according to claim 6 , wherein the electrode mixture includes a solid electrolyte.

8 . The electrode mixture according to claim 7 , wherein the solid electrolyte is a sulfide solid electrolyte.

9 . 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 6 .

10 . The battery according to claim 9 , wherein the positive electrode layer includes the electrode mixture.

11 . The battery according to claim 9 , wherein the electrolyte layer includes a solid electrolyte.

12 . A coat solution of forming the coating layer in the coated active material of claim 1 , the coat solution comprising:
a solute including a B element, a P element, and a La element; and water that is a solvent, wherein: a molar ratio (La/P) of the La element to the P element is 0.001 or more and 0.100 or less; and an absorbance of the coat solution is 0.1 or less.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kubota Masaru

Classifications

• H01M4/362

  Composites · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/624

  Electric conductive fillers · CPC title

• H01M4/621

  Binders · CPC title