Oxide solid electrolyte, coated active material, battery, and method for producing coated active material

Patent metadata

Field	Value
Publication number	US-2025266462-A1
Application number	US-202519025330-A
Country	US
Kind code	A1
Filing date	Jan 16, 2025
Priority date	Feb 15, 2024
Publication date	Aug 21, 2025
Grant date	—

Abstract

The present disclosure relates to an oxide solid electrolyte, a coated active material, a battery, and a method for producing a coated active material. In the present disclosure, the oxide solid electrolyte containing an Li element, a B element, a P element, and an O element and containing a three-coordinated boron having a coordination number of three is provided.

First claim

What is claimed is:

1 . An oxide solid electrolyte containing an Li element, a B element, a P element, and an O element, the oxide solid electrolyte comprising a three-coordinated boron having a coordination number of three.

2 . The oxide solid electrolyte according to claim 1 , wherein:
the oxide solid electrolyte contains a four-coordinated boron having a coordination number of four; and when a peak area of the three-coordinated boron is denoted by Sa and a peak area of the four-coordinated boron is denoted by Sb, the peak areas being obtained by NMR measurement of the oxide solid electrolyte, a proportion Sa/(Sa+Sb) of the peak area Sa with respect to a sum of the peak area Sa and the peak area Sb is 1% or more.

3 . The oxide solid electrolyte according to claim 2 , wherein the proportion Sa/(Sa+Sb) is 45% or less.

4 . The oxide solid electrolyte according to claim 3 , wherein the proportion Sa/(Sa+Sb) is 3% or more and 37% or less.

5 . The oxide solid electrolyte according to claim 1 , wherein a proportion Li/(B+P) of the Li element with respect to a total of the B element and the P element is 0.10 or more and 1.20 or less.

6 . The oxide solid electrolyte according to claim 1 , wherein an ionic conductivity at 25° C. is 1.50×10 −9 S/cm or more.

7 . The oxide solid electrolyte according to claim 1 , wherein an average particle diameter D 50 of the oxide solid electrolyte is 3.0 μm or more and 8.0 μm or less.

8 . A coated active material comprising:
an electrode active material; and a coating layer which coats the electrode active material, wherein: the coating layer contains the oxide solid electrolyte according to claim 1 .

9 . The coated active material according to claim 8 , wherein the electrode active material is an oxide active material.

10 . The coated active material according to claim 9 , wherein the oxide active material is at least one of lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide, and lithium nickel cobalt manganese aluminum oxide.

11 . The coated active material according to claim 8 , wherein:
the electrode active material includes a negative electrode active material; the negative electrode active material is an Si-based active material; and the Si-based active material has a clathrate type I crystalline phase or a clathrate type II crystalline phase.

12 . A battery comprising:
a positive electrode active material layer; a negative electrode active material layer; and an electrolyte layer disposed between the positive electrode active material layer and the negative electrode active material layer, wherein: at least one of the positive electrode active material layer and the negative electrode active material layer contains a coated active material including an electrode active material and a coating layer which coats the electrode active material; and the coating layer contains the oxide solid electrolyte according to claim 1 .

13 . The battery according to claim 12 , wherein the positive electrode active material layer contains the coated active material.

14 . The battery according to claim 12 , wherein the battery is a solid-state battery.

15 . A method for producing a coated active material including an electrode active material and a coating layer which coats the electrode active material, the method comprising:
preparing the oxide solid electrolyte according to claim 1 ; and forming the coating layer by coating the electrode active material with the oxide solid electrolyte by a dry process, wherein: the preparing includes a precursor producing treatment of producing a powdery precursor of the oxide solid electrolyte containing an Li element, a B element, a P element, and an O element, and a firing treatment of firing the precursor at a temperature of 450° C. or lower.

16 . The method according to claim 15 , wherein in the firing treatment, the precursor is fired at a temperature of 120° C. or higher.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kubota Masaru

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title