# US 10,480,090 B2 · Electrolytic copper foil, current collector comprising the same, electrode comprising the same, secondary battery comprising the same, and method for manufacturing the same

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- Number: US 10,480,090 B2
- Document ID: US10480090B2
- Status: Granted
- Kind: B2
- Application number: 15/307,069
- Filed: 2016-04-28
- Published: 2018-05-03
- Granted: 2019-11-19
- Earliest claimed: 2015-06-24
- Assignees: Kcf Technologies, Inc.
- Applicants: LS Mtron Ltd.
- Inventors: Dae Young Kim; Seung Min Kim
- Web page: https://patentgrep.com/patent/US10480090B2

## CPC

- C25D 1/04: Wires; Strips; Foils
- C25D 3/38: of copper
- H01M 4/66: Selection of materials
- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- H01M 4/665: {Composites}
- H01M 4/667: {in the form of layers, e.g. coatings}
- H01M 10/052: Li-accumulators
- H01M 4/386: {Silicon or alloys based on silicon}
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- 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
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An electrolytic copper foil, a current collector including the same, an electrode including the same, a secondary battery including the same and a method for manufacturing the same which can secure secondary batteries with high capacity maintenance. The electrolytic copper foil includes a first surface and a second surface opposite to the first surface, wherein each of the first and second surfaces has a peak count roughness Rpc of 10 to 100.

## Claims

### Claim 1

An electrolytic copper foil for a secondary battery, the electrolytic copper foil comprising:
a first surface; and
a second surface opposite to the first surface,
wherein each of the first and second surfaces has a peak count roughness Rpc of 10 to 100,
wherein the peak count roughness Rpc of each of the first and second surfaces is an average of peak count roughness Rpc values measured at randomly-selected three points,
the peak count roughness Rpc of each point is the number of effective peaks which rise above an upper criteria line of 0.5 μm per unit sampling length of 4 mm in a surface roughness profile obtained according to steel-iron test schedule (SEP 1940), and
there is at least one valley deeper than a lower criteria line of −0.5 μm between adjacent ones of the effective peaks.

### Claim 2 (depends on 1)

The electrolytic copper foil according to claim 1, wherein a difference in peak count roughness Rpc between the first and second surfaces is 60 or less.

### Claim 3 (depends on 1)

The electrolytic copper foil according to claim 1, wherein each of the first and second surfaces has a ten-point mean roughness RzJIS of 2 μm or less.

### Claim 4 (depends on 1)

The electrolytic copper foil according to claim 1, wherein the electrolytic copper foil has a thickness of 3 to 20 μm and tensile strength of 30 to 60 kgf/mm2.

### Claim 5 (depends on 1)

A current collector for a secondary battery, the current collector comprising:
the electrolytic copper foil according to claim 1; and
a protective layer disposed on the electrolytic copper foil,
wherein the protective layer comprises at least one of chromate, benzotriazole and a silane compound.

### Claim 6 (depends on 5)

The current collector according to claim 5, wherein the protective layer is formed on the first and second surfaces of the electrolytic copper foil.

### Claim 7 (depends on 1)

An electrode for a secondary battery, the electrode comprising:
a current collector comprising the electrolytic copper foil according to claim 1; and
an active material layer disposed on the current collector;
wherein the active material layer comprises at least one active material selected from the group consisting of: carbon; a metal (Me) of Si, Ge, Sn, Li, Zn, Mg, Cd, Ce, Ni or Fe; an alloy containing the metal; an oxide of the metal (MeOx); and a chemical compound of the metal and carbon.

### Claim 8 (depends on 7)

The electrode according to claim 7, wherein the active material layer comprises Si.

### Claim 9 (depends on 7)

The electrode according to claim 7, wherein the current collector further comprises a protective layer comprising at least one of chromate, benzotriazole and a silane compound, and
wherein the protective layer is interposed between the electrolytic copper foil and the active material layer.

### Claim 10 (depends on 1)

A secondary battery comprising:
a cathode;
an anode;
an electrolyte for providing an environment enabling lithium ions to move between the cathode and the anode; and
a separator for electrically insulating the cathode from the anode,
wherein the anode comprises:
a current collector comprising the electrolytic copper foil according to claim 1; and
an active material layer disposed on the current collector.

### Claim 11 (depends on 10)

The secondary battery according to claim 10, further comprising a protective layer comprising at least one of chromate, benzotriazole and a silane compound,
wherein the protective layer is interposed between the electrolytic copper foil and the active material layer.