Electrode layer and battery

Patent metadata

Field	Value
Publication number	US-2026038820-A1
Application number	US-202519274126-A
Country	US
Kind code	A1
Filing date	Jul 18, 2025
Priority date	Jul 30, 2024
Publication date	Feb 5, 2026
Grant date	—

Abstract

A main object of the present disclosure is to provide an electrode layer of which resistance increase due to charge and discharge is little. The present disclosure achieves the object by providing an electrode layer including an electrode active material including a Si element, and a binder including an unsaturated bond, wherein when the binder is dyed by Os dyeing and then an overlapping degree D of the Si element and the Os element is calculated based on an element mapping image obtained by a SEM-EDX measurement, the D is larger than 0.047.

First claim

What is claimed is:

1 . An electrode layer comprising an electrode active material including a Si element, and a binder including an unsaturated bond, wherein
when the binder is dyed by Os dyeing and then an overlapping degree D of the Si element and the Os element is calculated based on an element mapping image obtained by a SEM-EDX measurement, the D is larger than 0.047.

2 . The electrode layer according to claim 1 , wherein the D is 0.07 or more.

3 . The electrode layer according to claim 1 , wherein the D is 0.50 or less.

4 . The electrode layer according to claim 1 , wherein
an oxygen amount of the electrode active material is 1.0 mass % or more and 10 mass % or less; the electrode layer contains a solvent component; and in Hansen solubility parameter (HSP), δp of the solvent component is 6.0 MPa 0.5 or less.

5 . The electrode layer according to claim 1 , wherein
an oxygen amount of the electrode active material is 1.0 mass % or more and 10 mass % or less; the electrode layer contains a solid electrolyte; and in Hansen solubility parameter (HSP), δp of the solid electrolyte is 10.0 MPa 0.5 or more and 15.0 MPa 0.5 or less.

6 . The electrode layer according to claim 5 , wherein the solid electrolyte is a sulfide solid electrolyte.

7 . The electrode layer according to claim 1 , wherein the electrode active material is porous.

8 . The electrode layer according to claim 1 , wherein the electrode active material includes a silicon clathrate type crystal phase.

9 . The electrode layer according to claim 1 , wherein the electrode active material is an anode active material.

10 . A battery comprising a cathode layer, an anode layer, and an electrolyte layer arranged between the cathode layer and the anode layer, wherein
the cathode layer or the anode layer is the electrode layer according to claim 1 .

11 . The battery according to claim 10 , wherein the electrolyte layer contains a solid electrolyte.

Assignees

• Toyota Motor Co Ltd

Inventors

• Otaki Mitsutoshi
• Visbalmendoza Heidyhodex

Classifications

• H01M10/0525

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

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/364

  as mixtures · CPC title

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title