# US 2021/0242467 A1 · Electrodeposited copper foil, current collector, electrode, and lithium ion secondary battery comprising the same

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- Number: US 2021/0242467 A1
- Document ID: US20210242467A1
- Status: Published application
- Kind: A1
- Application number: 17/259,333
- Filed: 2020-01-15
- Published: 2021-08-05
- Earliest claimed: 2019-02-01
- Assignees: Chang Chun Petrochemical Co., Ltd.
- Applicants: Chang Chun Petrochemical Co., Ltd.
- Inventors: Huei-Fang HUANG; Ting-Chun LAI; Kuei-Sen CHENG; Jui-Chang CHOU; Yao-Sheng LAI
- Web page: https://patentgrep.com/patent/US20210242467A1

## CPC

- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- B32B 15/08: of synthetic resin
- B32B 15/20: comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)}
- C25D 1/04: Wires; Strips; Foils
- C25D 3/04: of chromium
- C25D 3/12: of nickel or cobalt
- C25D 3/22: of zinc
- C25D 3/38: of copper
- C25D 5/10: Electroplating with more than one layer of the same or of different metals (for bearings C25D7/10)
- C25D 5/14: two or more layers being of nickel or chromium, e.g. duplex or triplex layers
- C25D 5/16: Electroplating with layers of varying thickness
- C25D 5/48: After-treatment of electroplated surfaces
- C25D 9/08: by cathodic processes
- H01M 4/0469: {Electroforming a self-supporting electrode; Electroforming of powdered electrode material}
- H01M 4/70: characterised by shape or form
- 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
- H05K 1/0242: {Structural details of individual signal conductors, e.g. related to the skin effect}
- H05K 1/09: Use of materials for the {conductive, e.g. } metallic pattern
- H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence)
- H05K 1/181: associated with surface mounted components
- H05K 3/384: {by plating}
- H05K 3/389: {by the use of a coupling agent, e.g. silane}
- B32B 2255/06: on metal layer
- B32B 2255/205: Metallic coating
- B32B 2255/28: Multiple coating on one surface
- B32B 2307/202: Conductive
- B32B 2457/08: PCBs, i.e. printed circuit boards
- C25D 3/08: Deposition of black chromium {, e.g. hexavalent chromium, CrVI}
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H05K 2201/0338: Layered conductor, e.g. layered metal substrate, layered finish layer or layered thin film adhesion layer
- H05K 2201/0355: Metal foils
- H05K 2201/0373: Conductors having a fine structure, e.g. providing a plurality of contact points with a structured tool
- H05K 2201/10522: Adjacent components
- H05K 2201/2054: Light-reflecting surface, e.g. conductors, substrates, coatings, dielectrics
- H05K 2203/0307: Providing micro- or nanometer scale roughness on a metal surface, e.g. by plating of nodules or dendrites
- Y02E 60/10: Energy storage using batteries
- Y10T 428/12431: Foil or filament smaller than 6 mils
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided are an electrodeposited copper foil, a current collector, an electrode, and a lithium-ion secondary battery comprising the same. The electrodeposited copper foil has a deposited side and a drum side opposite the deposited side. In a first aspect, ΔRS between the deposited side and the drum side is at most about 95 MPa, and the deposited side exhibits a Vv in a range from about 0.15 μm3/μm2 to about 1.35 μm3/μm2. In a second aspect, the deposited side has a Sku of about 1.5 to about 6.5 and the deposited side exhibits a Vv in a range from about 0.15 μm3/μm2 to about 1.35 μm3/μm2. The characteristics are beneficial to improve the quality of the electrodeposited copper foil, thereby extending the charge-discharge cycle life of a lithium-ion secondary battery comprising the same.

## Claims

### Claim 1

An electrodeposited copper foil comprising a deposited side and a drum side opposite the deposited side, wherein the deposited side and the drum side each possess a residual stress, an absolute value of a difference in the residual stress between the deposited side and the drum side is at most 95 MPa, and the deposited side exhibits a volume void (Vv) in a range from 0.15 μm3/μm2 to 1.35 μm3/μm2.

### Claim 2 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the deposited side of the electrodeposited copper foil has a Kurtosis (Sku) in a range from 1.5 to 6.5.

### Claim 3 (depends on 2)

The electrodeposited copper foil as claimed in claim 2, wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.6 to 6.2.

### Claim 4 (depends on 3)

The electrodeposited copper foil as claimed in claim 3, wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.7 to 5.8.

### Claim 5 (depends on 2)

The electrodeposited copper foil as claimed in claim 2, wherein the drum side of the electrodeposited copper foil has a Sku in a range from 1.5 to 6.5.

### Claim 6 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the deposited side of the electrodeposited copper foil exhibits the Vv in the range from 0.15 μm3/μm2 to 1.30 μm3/μm2.

### Claim 7 (depends on 2)

The electrodeposited copper foil as claimed in claim 2, wherein the deposited side of the electrodeposited copper foil exhibits the Vv in the range from 0.16 m3/μm2 to 1.18 μm3/μm2.

### Claim 8 (depends on 7)

The electrodeposited copper foil as claimed in claim 7, wherein the deposited side of the electrodeposited copper foil exhibits the Vv in the range from 0.17 m3/μm2 to 1.11 μm3/μm2.

### Claim 9 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the absolute value of the difference in the residual stress between the deposited side and the drum side of the electrodeposited copper foil is at most 85 MPa.

### Claim 10 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the absolute value of the difference in the residual stress between the deposited side and the drum side of the electrodeposited copper foil is in a range from 5 MPa to 95 MPa.

### Claim 11 (depends on 10)

The electrodeposited copper foil as claimed in claim 10, wherein the absolute value of the difference in the residual stress between the deposited side and the drum side of the electrodeposited copper foil is in the range from 5 MPa to 60 MPa.

### Claim 12 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the deposited side of the electrodeposited copper foil exhibits a core void volume (Vvc) in a range from 0.14 μm3/μm2 to 1.15 μm3/μm2.

### Claim 13 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the deposited side of the electrodeposited copper foil exhibits a dale void volume (Vvv) of at most 0.15 μm3/μm2.

### Claim 14 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the drum side of the electrodeposited copper foil exhibits a Vv in a range from 0.15 μm3/μm2 to 1.30 μm3/μm2.

### Claim 15 (depends on 1)

The electrodeposited copper foil as claimed in claim 1, wherein the electrodeposited copper foil comprises a bare copper foil and a surface-treated layer disposed on the bare copper foil, and the drum side and the deposited side are located at outermost sides of the electrodeposited copper foil.

### Claim 16

An electrodeposited copper foil comprising a deposited side and a drum side opposite the deposited side, wherein the deposited side has a Sku in a range from 1.5 to 6.5, and the deposited side exhibits a Vv in a range from 0.15 μm3/μm2 to 1.35 μm3/μm2.

### Claim 17 (depends on 16)

The electrodeposited copper foil as claimed in claim 16, wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.6 to 6.2.

### Claim 18 (depends on 17)

The electrodeposited copper foil as claimed in claim 17, wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.7 to 5.8.

### Claim 19 (depends on 16)

The electrodeposited copper foil as claimed in claim 16, wherein the drum side of the electrodeposited copper foil has a Sku in a range from 1.5 to 6.5.

### Claim 20 (depends on 16)

The electrodeposited copper foil as claimed in claim 16, wherein the deposited side of the electrodeposited copper foil exhibits the Vv in the range from 0.15 μm3/μm2 to 1.30 μm3/μm2.

### Claim 21 (depends on 20)

The electrodeposited copper foil as claimed in claim 20, wherein the deposited side of the electrodeposited copper foil exhibits the Vv in the range from 0.17 μm3/μm2 to 1.11 μm3/μm2.

### Claim 22 (depends on 20)

The electrodeposited copper foil as claimed in claim 20, wherein the deposited side of the electrodeposited copper foil exhibits a Vvc in a range from 0.14 μm3/μm2 to 1.15 μm3/μm2.

### Claim 23 (depends on 20)

The electrodeposited copper foil as claimed in claim 20, wherein the deposited side of the electrodeposited copper foil exhibits a Vvv of at most 0.15 μm3/μm2.

### Claim 24 (depends on 20)

The electrodeposited copper foil as claimed in claim 20, wherein the drum side of the electrodeposited copper foil exhibits a Vv in a range from 0.15 μm3/μm2 to 1.30 μm3/μm2.

### Claim 25 (depends on 16)

The electrodeposited copper foil as claimed in claim 16, wherein the electrodeposited copper foil comprises a bare copper foil and a surface-treated layer disposed on the bare copper foil, and the drum side and the deposited side are located at outermost sides of the electrodeposited copper foil.

### Claim 26 (depends on 1)

A current collector for a lithium-ion secondary battery, comprising the electrodeposited copper foil as claimed in claim 1.

### Claim 27 (depends on 26)

An electrode for a lithium-ion secondary battery, comprising the current collector as claimed in claim 26 and an active substance coated on the current collector.

### Claim 28 (depends on 27)

A lithium-ion secondary battery, comprising the electrode as claimed in claim 27.

### Claim 29 (depends on 16)

A current collector for a lithium-ion secondary battery, comprising the electrodeposited copper foil as claimed in claim 16.

### Claim 30 (depends on 29)

An electrode for a lithium-ion secondary battery, comprising the current collector as claimed in claim 29 and an active substance coated on the current collector.

### Claim 31 (depends on 30)

A lithium-ion secondary battery, comprising the electrode as claimed in claim 30.