Electrodeposited copper foil, current collector, electrode, and lithium ion secondary battery comprising the same

Patent metadata

Field	Value
Publication number	US-2021242467-A1
Application number	US-202017259333-A
Country	US
Kind code	A1
Filing date	Jan 15, 2020
Priority date	Feb 1, 2019
Publication date	Aug 5, 2021
Grant date	—

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 μm 3 /μm 2 to about 1.35 μm 3 /μm 2 . 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 μm 3 /μm 2 to about 1.35 μm 3 /μm 2 . 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.

First claim

What is claimed is:

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 μm 3 /μm 2 to 1.35 μm 3 /μm 2 .

2 . 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.

3 . 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.

4 . 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.

5 . 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.

6 . 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 μm 3 /μm 2 to 1.30 μm 3 /μm 2 .

7 . 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 m 3 /μm 2 to 1.18 μm 3 /μm 2 .

8 . 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 m 3 /μm 2 to 1.11 μm 3 /μm 2 .

9 . 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.

10 . 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.

11 . 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.

12 . 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 μm 3 /μm 2 to 1.15 μm 3 /μm 2 .

13 . 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 μm 3 /μm 2 .

14 . 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 μm 3 /μm 2 to 1.30 μm 3 /μm 2 .

15 . 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.

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 μm 3 /μm 2 to 1.35 μm 3 /μm 2 .

17 . 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.

18 . 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.

19 . 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.

20 . 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 μm 3 /μm 2 to 1.30 μm 3 /μm 2 .

21 . 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 μm 3 /μm 2 to 1.11 μm 3 /μm 2 .

22 . 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 μm 3 /μm 2 to 1.15 μm 3 /μm 2 .

23 . 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 μm 3 /μm 2 .

24 . 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 μm 3 /μm 2 to 1.30 μm 3 /μm 2 .

25 . 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.

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

27 . 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.

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

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

30 . 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.

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

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

• Huang Huei-Fang
• Lai Ting-Chun
• Cheng Kuei-Sen
• Chou Jui-Chang
• Lai Yao-Sheng

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/0525

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