# US 10,122,021 B2 · Electrolytic copper foil, and collector, negative electrode, and lithium battery comprising same

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- Number: US 10,122,021 B2
- Document ID: US10122021B2
- Status: Granted
- Kind: B2
- Application number: 15/127,625
- Filed: 2015-03-20
- Published: 2017-05-18
- Granted: 2018-11-06
- Earliest claimed: 2014-03-20
- Assignees: Iljin Materials Co., Ltd.
- Applicants: Iljin Materials Co., Ltd.
- Inventors: Ki Deok Song; Sun Hyoung Lee; Tae Jin Jo; Seul Ki Park
- Web page: https://patentgrep.com/patent/US10122021B2

## CPC

- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01G 11/28: arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
- H01G 11/68: characterised by their material
- H01G 11/70: characterised by their structure
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/052: Li-accumulators
- H01M 2004/027: {Negative electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed is an electrolytic copper foil having specific resistivity of 1.68 to 1.72 μΩ·cm and a grain mean diameter of a crystallite less than 0.41 to 0.80 μm.

## Claims

### Claim 1

An electrolytic copper foil having specific resistivity of 1.68 to 1.72 μΩ·cm and a grain mean diameter of a crystallite less than 0.41 to 0.80 μm,
wherein the electrolytic copper foil has a single modal grain size distribution representing one peak in a grain size distribution diagram obtained from an Electron Backscattering Diffraction Pattern (EBSP) analysis of the crystallite, and a Full Width at Half Maximum (FWHM) of the peak may be less than 0.7 μm,
wherein in an XRD spectrum for a matte side of the electrolytic copper foil, M(220)/M(111) that is a ratio of an orientation index (M(220)) for a (220) crystalline surface to an orientation index (M(111)) for a (111) crystalline surface is 3.4 to 8.5.

### Claim 2 (depends on 1)

The electrolytic copper foil of claim 1, wherein room-temperature tensile strength of the electrolytic copper foil is 55 kgf/mm2 or more.

### Claim 3 (depends on 1)

The electrolytic copper foil of claim 1, wherein a room-temperature elongation percentage of the electrolytic copper foil is 2.5% or more.

### Claim 4 (depends on 1)

The electrolytic copper foil of claim 1, wherein in an X-Ray Diffraction (XRD) spectrum for a matte surface of the electrolytic copper foil, I(220)/I(111) that is a ratio of strength (I(220)) of a diffraction peak for a (220) crystalline surface to strength (I(111)) of a diffraction peak for a (111) crystalline surface is 0.5 to 2.0.

### Claim 5 (depends on 1)

The electrolytic copper foil of claim 1, wherein a thickness of the electrolytic copper foil is 6 to 35 μm.

### Claim 6 (depends on 1)

A current collector comprising the electrolytic copper foil of claim 1.

### Claim 7 (depends on 6)

A negative electrode, comprising:
the current collector of claim 6; and
a negative electrode active material layer disposed on at least one surface of the current collector.

### Claim 8 (depends on 7)

The negative electrode of claim 7, wherein the negative electrode active material layer includes a negative electrode active material, a binder, and a conductive material.

### Claim 9 (depends on 7)

The negative electrode of claim 7, wherein the negative electrode active material includes one or more selected from the group consisting of a carbon-based material, a metal alloyable with lithium, a transition metal oxide, and a non-transition metal oxide.

### Claim 10 (depends on 7)

A lithium battery, comprising:
the negative electrode of claim 7;
a positive electrode; and
electrolyte disposed between the positive electrode and the negative electrode.