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

Patent metadata

Field	Value
Publication number	US-11283080-B2
Application number	US-202017259333-A
Country	US
Kind code	B2
Filing date	Jan 15, 2020
Priority date	Feb 1, 2019
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

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.

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 void_volume (Vv) in a range from 0.15 μm 3 /μm 2 to 1.35 μm 3 /μm 2 , and the deposited side of the electrodeposited copper foil has a Kurtosis (Sku) in a range from 1.5 to 6.5.

2. The electrodeposited copper foil as claimed in claim 1 , wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.6 to 6.2.

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 1.7 to 5.8.

4. The electrodeposited copper foil as claimed in claim 1 , wherein the drum side of the electrodeposited copper foil has a Sku in a range from 1.5 to 6.5.

5. 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 .

6. The electrodeposited copper foil as claimed in claim 5 , wherein the deposited side of the electrodeposited copper foil exhibits the Vv in the range from 0.16 μm 3 /μm 2 to 1.18 μm 3 /μm 2 .

7. The electrodeposited copper foil as claimed in claim 6 , 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 .

8. 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.

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 in a range from 5 MPa to 95 MPa.

10. The electrodeposited copper foil as claimed in claim 9 , 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.

11. 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 .

12. 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 .

13. 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 .

14. 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.

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

16. An electrode for a lithium-ion secondary battery, comprising the current collector as claimed in claim 15 and an active substance coated on the current collector.

17. A lithium-ion secondary battery, comprising the electrode as claimed in claim 16 .

18. 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 .

19. The electrodeposited copper foil as claimed in claim 18 , wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.6 to 6.2.

20. The electrodeposited copper foil as claimed in claim 19 , wherein the deposited side of the electrodeposited copper foil has the Sku in the range from 1.7 to 5.8.

21. The electrodeposited copper foil as claimed in claim 18 , wherein the drum side of the electrodeposited copper foil has a Sku in a range from 1.5 to 6.5.

22. The electrodeposited copper foil as claimed in claim 18 , 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 .

23. The electrodeposited copper foil as claimed in claim 22 , 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 .

24. The electrodeposited copper foil as claimed in claim 22 , 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 .

25. The electrodeposited copper foil as claimed in claim 22 , wherein the deposited side of the electrodeposited copper foil exhibits a Vvv of at most 0.15 μm 3 /μm 2 .

26. The electrodeposited copper foil as claimed in claim 22 , 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 .

27. The electrodeposited copper foil as claimed in claim 18 , 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.

28. A current collector for a lithium-ion secondary battery, comprising the electrodeposited copper foil as claimed in claim 18 .

29. An electrode for a lithium-ion secondary battery, comprising the current collector as claimed in claim 28 and an active substance coated on the current collector.

30. A lithium-ion secondary battery, comprising the electrode as claimed in claim 29 .

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

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

Classifications

• C25D1/04 Primary

  Wires; Strips; Foils · CPC title

• H05K2201/10522

  Adjacent components · CPC title

• H05K2201/0338

  Layered conductor, e.g. layered metal substrate, layered finish layer or layered thin film adhesion layer · CPC title

• B32B15/01

  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)} · CPC title

• C25D5/14

  two or more layers being of nickel or chromium, e.g. duplex or triplex layers · CPC title