# US 2026/0100380 A1 · Copper substrate for negative electrode current collector of rechargeable lithium battery, negative electrode including same, and rechargeable lithium battery including the same

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- Number: US 2026/0100380 A1
- Document ID: US20260100380A1
- Status: Published application
- Kind: A1
- Application number: 19/344,733
- Filed: 2025-09-30
- Published: 2026-04-09
- Earliest claimed: 2024-10-04
- Assignees: Samsung SDI Co., Ltd.
- Applicants: Samsung SDI Co., Ltd.
- Inventors: Suho SONG; Hiroshi SEINO
- Web page: https://patentgrep.com/patent/US20260100380A1

## CPC

- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 4/668: {Composites of electroconductive material and synthetic resins}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed are a copper substrate for a negative electrode for a rechargeable lithium battery, a negative electrode including the copper substrate, and a rechargeable lithium battery including the negative electrode. The copper substrate has a microstrain according to Lab source Powder X-ray diffraction analysis of about 0.04% to about 0.17%.

## Claims

### Claim 1

A copper substrate for a negative electrode current collector of a rechargeable lithium battery, the copper substrate comprising:
a microstrain determined by X-ray diffraction analysis in a range of about 0.04% to about 0.17%.

### Claim 2 (depends on 1)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 1, wherein the microstrain is in a range of about 0.04% to about 0.14%.

### Claim 3 (depends on 1)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 1, wherein a texture fraction of a (220) plane diffraction line according to the X-ray diffraction density of the copper substrate is in a range of about 10% to about 80%.

### Claim 4 (depends on 3)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 3, wherein the fraction of the (220) plane diffraction line according to the X-ray diffraction density of the copper substrate is in a range of about 10% to about 60%.

### Claim 5 (depends on 1)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 1, wherein a thickness of the copper substrate is in a range of about 1 μm to about 20 μm.

### Claim 6 (depends on 1)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 1, wherein the X-ray diffraction analysis is performed using a CuKα ray.

### Claim 7 (depends on 1)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 1, wherein the copper substrate further comprises a polymer layer.

### Claim 8 (depends on 7)

The copper substrate for a negative electrode current collector of a rechargeable lithium battery as claimed in claim 7, wherein the copper substrate comprises:
a first copper layer and a second copper layer, and
a polymer layer between the first copper layer and the second copper layer.

### Claim 9 (depends on 1)

The copper substrate of claim 1, wherein the microstrain is determined according to a Lab source Powder X-ray diffraction analysis.

### Claim 10 (depends on 1)

A negative electrode for a rechargeable lithium battery, the negative electrode comprising:
a current collector including the copper substrate as claimed in claim 1; and
a negative electrode active material layer located on the current collector and including a negative electrode active material.

### Claim 11 (depends on 1)

A rechargeable lithium battery, comprising:
a negative electrode including a current collector including the copper substrate as claimed in claim 1; and
a negative electrode active material layer located on the current collector and including a negative electrode active material;
a positive electrode including a positive electrode active material; and
a non-aqueous electrolyte.