Composite substrate for rechargeable lithium battery and rechargeable lithium battery including the same

Patent metadata

Field	Value
Publication number	US-2026074234-A1
Application number	US-202519287152-A
Country	US
Kind code	A1
Filing date	Jul 31, 2025
Priority date	Sep 12, 2024
Publication date	Mar 12, 2026
Grant date	—

Abstract

Examples of the disclosure include a composite substrate for a rechargeable lithium battery that includes a support layer including a polymer film, and a metal layer disposed on the support layer and including at least one of copper and copper oxide. The metal layer includes a first metal layer on a surface of the support layer and including an adhesion enhancer and a first copper, and a second metal layer on the first metal layer and including a second copper. The adhesion enhancer includes a first moiety chemically bonded to the surface of the support layer and including a hydroxyalkylene group, and a second moiety including an amine group configured to adsorb the first copper.

First claim

What is claimed is:

1 . A composite substrate for a rechargeable lithium battery, the composite substrate comprising:
a support layer comprising a polymer film; and a metal layer on the support layer and comprising at least one of copper and copper oxide, wherein the metal layer comprises:
a first metal layer on a surface of the support layer and comprising an adhesion enhancer and a first copper; and
a second metal layer on the first metal layer and comprising a second copper, and
the adhesion enhancer comprises:
a first moiety chemically bonded to the surface of the support layer and comprising a hydroxyalkylene group; and
a second moiety comprising an amine group configured to adsorb the first copper.

2 . The composite substrate for a rechargeable lithium battery of claim 1 , wherein the adhesion enhancer comprises a compound of Formula 1 below:

R1 comprises one of direct bonding or a C 1 to C 10 alkylene group, and
n is an integer in a range of 0 to 10.

3 . The composite substrate for a rechargeable lithium battery of claim 2 , wherein n is equal to 2.

4 . The composite substrate for a rechargeable lithium battery of claim 1 , wherein a bonding strength between the metal layer and the support layer is in a range of about 700 N/m to about 1200 N/m.

5 . The composite substrate for a rechargeable lithium battery of claim 1 , wherein the first metal layer has a thickness in a range of about 2 nm to about 5 nm.

6 . The composite substrate for a rechargeable lithium battery of claim 1 , further comprising a negative electrode coating layer on the metal layer, wherein the negative electrode coating layer comprises a negative electrode active material, a binder, and a conductive material.

7 . The composite substrate for a rechargeable lithium battery of claim 1 , wherein the polymer film comprises at least one of a polyethylene film, a polypropylene film, a polyvinylidene chloride film, and a multilayer film including a combination thereof.

8 . The composite substrate for a rechargeable lithium battery of claim 1 , wherein the support layer has a thickness in a range of about 2 μm to about 10 μm.

9 . A method for preparing a composite substrate for a rechargeable lithium battery, the method comprising:
modifying a surface of a support layer; forming a first metal layer comprising a first copper on the modified surface of the support layer; and forming a second metal layer comprising a second copper on the first metal layer, wherein the forming of the first metal layer comprises:
bonding a first compound comprising a glycidyl group to the modified surface of the support layer;
bonding a second compound comprising an amine group to an end of the first compound to form an adhesion enhancer;
impregnating the support layer with a first solution comprising first copper ions; and
impregnating the support layer with a second solution comprising a reducing agent to reduce the first copper ions.

10 . The method of claim 9 , wherein the modifying of the surface of the support layer comprises performing at least one of plasma treatment and acid treatment.

11 . The method of claim 9 , wherein the modified surface of the support layer comprises at least one of —O 2− , —OH, and —COOH.

12 . The method of claim 9 , wherein the adhesion enhancer comprises a compound of Formula 1:

wherein R1 comprises one of C 1 to C 10 alkylene groups, and
n is a natural number that is equal to or greater than 1.

13 . The method of claim 12 , wherein n is equal to 2.

14 . The method of claim 9 , wherein the reducing agent of the second solution comprises at least one of formaldehyde, glucose, sodium hypophosphate, and boron compounds.

15 . The method of claim 9 ,
wherein the forming of the second metal layer comprises impregnating the support layer and the first metal layer on the support layer with a third solution comprising second copper ions.

16 . The method of claim 15 , wherein the third solution further comprises an electrolyte, a complexing agent, and a pH regulator, and
the electrolyte comprises at least one of copper sulfate (CuSO 4 ), sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl), copper chloride (CuCl 2 ), and acetic acid (C 2 H 4 O 2 ).

17 . The method of claim 9 , wherein the first solution has a pH in a range of about 3 to about 5.

18 . The method of claim 9 , wherein the forming of the adhesion enhancer is performed at a temperature in a range of about 60° C. to about 80° C.

19 . The method of claim 9 , wherein the support layer comprises a polymer film, and
the polymer film comprises at least one of a polyethylene film, a polypropylene film, a polyvinylidene chloride film, and a multilayer film including a combination thereof.

20 . A rechargeable lithium battery comprising:
the composite substrate of claim 1 ; and a battery cell on the composite substrate, wherein the battery cell comprises:
a first active material layer on the metal layer;
a separator on the first active material layer;
a second active material layer on the separator; and
a metal substrate on the second active material layer.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Kim Junyoung
• Lee Wonhyung
• Kim Suhyun
• CHA Jungwook
• Lee Kyuseo
• Yoon Yeonhee
• Kang Dayoung
• Kwon Minseok
• Woo Seokho

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• B32B15/08

  of synthetic resin · CPC title