Electrode for rechargeable battery, electrode assembly, and rechargeable battery including the same

Patent metadata

Field	Value
Publication number	US-2024396009-A1
Application number	US-202318397503-A
Country	US
Kind code	A1
Filing date	Dec 27, 2023
Priority date	May 22, 2023
Publication date	Nov 28, 2024
Grant date	—

Abstract

An electrode for a rechargeable battery according to an embodiment includes a substrate having a first surface and a second surface, a middle layer on the first surface of the substrate, and a first active material layer on the middle layer, wherein a surface roughness of the first surface of the substrate and a surface roughness of the second surface of the substrate are different, and the middle layer is on the first surface having a relatively larger surface roughness than the second surface.

First claim

What is claimed is:

1 . An electrode for a rechargeable battery comprising:
a substrate having a first surface and a second surface, a middle layer on the first surface of the substrate, and a first active material layer on the middle layer, wherein a surface roughness of the first surface of the substrate and a surface roughness of the second surface of the substrate are different, and the middle layer is on the first surface having a relatively larger surface roughness than the second surface.

2 . The electrode for the rechargeable battery as claimed in claim 1 , wherein:
the middle layer is provided along protrusions and depressions on the first surface.

3 . The electrode for the rechargeable battery as claimed in claim 2 , wherein:
the middle layer has a thickness of 0.01% to 5% of the electrode thickness.

4 . The electrode for the rechargeable battery as claimed in claim 3 , wherein:
the thickness of the middle layer is 10 nm to 5 μm.

5 . The electrode for the rechargeable battery as claimed in of claim 4 , wherein:
the thickness of the middle layer is 20 nm to 2 μm.

6 . The electrode for the rechargeable battery as claimed in claim 2 , wherein:
the surface roughness of the middle layer has a smaller value than the surface roughness of the first surface.

7 . The electrode for the rechargeable battery as claimed in claim 1 , wherein:
the surface roughness of the first surface of the substrate: the surface roughness of the second surface of the substrate has a ratio of 1:1 to 100:1.

8 . The electrode for the rechargeable battery as claimed in claim 7 , wherein:
the surface roughness of the first surface is over 1.5 μm, and the surface roughness of the second surface is 0.1 μm to 1 μm.

9 . The electrode for the rechargeable battery as claimed in claim 1 , further comprising:
a second active material layer on the second surface.

10 . The electrode for the rechargeable battery as claimed in claim 9 , wherein:
The first active material layer and the second active material layer are a negative active material comprising carbon.

11 . The electrode for the rechargeable battery as claimed in claim 9 , wherein:
an average particle size of the negative active material is larger than the gap between protrusions on one surface of the substrate.

12 . The electrode for the rechargeable battery as claimed in claim 1 , wherein:
the middle layer comprises a carbon-based conductive material and a binder.

13 . The electrode for the rechargeable battery as claimed in claim 12 , wherein:
the carbon-based conductive material comprises a carbon-based conductive material included in the first active material layer.

14 . The electrode for the rechargeable battery as claimed in claim 1 , wherein:
the substrate comprises copper.

15 . An electrode assembly comprising:
a first electrode comprising the electrode as claimed in claim 1 , a second electrode of an opposite polarity to the first electrode, and a separator positioned between the first electrode and the second electrode.

16 . A rechargeable battery comprising:
an electrode assembly as claimed in claim 15 , a case that accommodates the electrode assembly and an electrolyte, and a cap assembly that covers and seals the case.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ko Youngsan
• Kang Younghye
• Oh Songyul
• Lee Junsik
• Lee Gunwook
• Lee Boram

Classifications

• H01M2004/021

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

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0525

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

• H01M4/133 Primary

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title