Positive electrode current collectors for rechargeable lithium batteries, electrodes containing positive electrode current collectors, and rechargeable lithium batteries containing positive electrode current collectors

Patent metadata

Field	Value
Publication number	US-2026024777-A1
Application number	US-202519275039-A
Country	US
Kind code	A1
Filing date	Jul 21, 2025
Priority date	Jul 22, 2024
Publication date	Jan 22, 2026
Grant date	—

Abstract

The present disclosure relates to a positive electrode current collector for a rechargeable lithium battery, a positive electrode including the positive electrode current collector, and a rechargeable lithium battery including the positive electrode current collector. In particular, the present disclosure relates to a positive electrode current collector including an aluminum alloy current collector; and an aggregate including Cu and Al dispersed inside the aluminum alloy collector, wherein the aggregate includes Cu and Al which satisfy a certain mathematical relationship.

First claim

1 . A positive electrode current collector for a rechargeable lithium battery, comprising:
an aluminum alloy current collector; and an aggregate comprising Cu and Al, wherein the aggregate is dispersed in the aluminum alloy current collector and satisfies Formula 1:

0
<

100
*
A
/

(

A
+
B

)

≤

2
⁢
0

[

Formula
⁢

1

]

where A is a content of Si (at %) based on a total amount of 100 at % of the aggregate, and B is a content of Cu (at %) based on the total amount of 100 at % of the aggregate.

2 . The positive electrode current collector as claimed in claim 1 , wherein a total Al content based on a total amount of 100 wt % of the positive electrode current collector is greater than or equal to about 99 wt % and less than or equal to about 100 wt %.

3 . The positive electrode current collector as claimed in claim 1 , wherein a total Cu content based on a total amount of 100 at % of the positive electrode current collector is about 0.16 to about 0.20 at %.

4 . The positive electrode current collector as claimed in claim 1 , wherein the aggregate satisfies Formula 2:

2
⁢
0

<

100
*
B
/

(

B
+
C

)

≤
60

[

Formula
⁢

2

]

where C is a content of Al (at %) based on the total amount of 100 at % of the aggregate.

5 . The positive electrode current collector as claimed in claim 4 , wherein the aggregate further comprises Si or Fe and satisfies Formula 3:

0
<

100
*

(

A
+
D

)

/

(

A
+
B
+
D

)

≤

3
⁢
5

[

Formula
⁢

3

]

where D is a content of Fe (at %) based on the total amount of 100 at % of the aggregate.

6 . The positive electrode current collector as claimed in claim 5 , wherein based on the total amount of 100 at % of the aggregate, the content of Si is greater than or equal to about 0.1 at % and less than or equal to about 4 at %, the content of Cu is greater than or equal to about 20 at % and less than or equal to about 60 at %, and the content of Fe is greater than or equal to about 1 at % and less than or equal to about 15 at %.

7 . The positive electrode current collector as claimed in claim 1 , wherein the aluminum alloy current collector comprises Cu and Al and satisfies Formula 4:

1
⁢
0

≤

100
*
Y
/

(

Y
+
Z

)

≤

5
⁢
0

[

Formula
⁢

4

]

where Y is a content of Cu (at %) based on a total amount of 100 at % of the aluminum alloy current collector, and Z is a content of Al (at %) based on the total amount of 100 at % of the aluminum alloy current collector.

8 . The positive electrode current collector as claimed in claim 7 , wherein the aluminum alloy current collector further comprises Si or Fe and satisfies Formula 5:

0
<

100
*

(

X
+
W

)

/

(

X
+
Y
+
W

)

Assignees

• Samsung Sdi Co Ltd

Inventors

• Ju Hyejin
• Kim Yongsic
• Shin Ho Sik
• Yoo Heeeun
• Lee Eunsol

Classifications

• H01M2004/021

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

• H01M10/0525

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

• C22F1/057

  of alloys with copper as the next major constituent · CPC title

• C22C21/14 Primary

  with silicon · CPC title

• B21B2003/001

  Aluminium or its alloys · CPC title