Electrolytic copper foil and electrode and lithium-ion cell comprising the same

Patent metadata

Field	Value
Publication number	US-2023420640-A1
Application number	US-202217959705-A
Country	US
Kind code	A1
Filing date	Oct 4, 2022
Priority date	Jun 28, 2022
Publication date	Dec 28, 2023
Grant date	—

Abstract

Provided are an electrolytic copper foil, an electrode and a lithium-ion cell comprising the same. The electrolytic copper foil has a first surface and a second surface, which are analyzed by grazing incidence X-ray diffraction (GIXRD), and each have an intensity of a characteristic peak of ( 111 ) plane denoted by I 1 , an intensity of a characteristic peak of ( 200 ) plane denoted by I 2 , an intensity of a characteristic peak of ( 220 ) plane denoted by I 3 , an FWHM of the characteristic peak of ( 111 ) plane denoted by W 1 , and an FWHM of the characteristic peak of ( 200 ) plane denoted by W 2 . The first and second surfaces each have a ratio of (I 1 +I 2 )/(I 1 +I 2 +I 3 ) of 0.83 or more and a value of (W 1 +W 2 ) of 0.80 or less. By controlling the features, it can improve the corrosion resistance of the electrolytic copper foil and further increase the safety of the lithium-ion cell.

First claim

What is claimed is:

1 . An electrolytic copper foil, comprising a first surface and a second surface opposite the first surface,
wherein the first surface and the second surface are analyzed by grazing incidence X-ray diffraction and each have an intensity of a characteristic peak of ( 111 ) plane denoted by I 1 , an intensity of a characteristic peak of ( 200 ) plane denoted by I 2 , an intensity of a characteristic peak of ( 220 ) plane denoted by I 3 , a full width at half maximum of the characteristic peak of ( 111 ) plane denoted by W 1 , and a full width at half maximum of the characteristic peak of ( 200 ) plane denoted by W 2 , wherein the first surface and the second surface each have a ratio of (I 1 +I 2 )/(I 1 +I 2 +I 3 ) more than or equal to 0.83 and a value of (W 1 +W 2 ) less than or equal to 0.80.

2 . The electrolytic copper foil as claimed in claim 1 , wherein the electrolytic copper foil has a yield strength more than 230 MPa.

3 . The electrolytic copper foil as claimed in claim 1 , wherein the first surface and the second surface each have the ratio of (I 1 +I 2 )/I 1 +I 2 +I 3 ) more than or equal to 0.84 and less than or equal to 1.00.

4 . The electrolytic copper foil as claimed in claim 1 , wherein the first surface and the second surface each have the value of (W 1 +W 2 ) more than or equal to 0.25 and less than or equal to 0.75.

5 . The electrolytic copper foil as claimed in claim 3 , wherein the first surface and the second surface each have the value of (W 1 +W 2 ) more than or equal to 0.25 and less than or equal to 0.75.

6 . The electrolytic copper foil as claimed in claim 1 , wherein the electrolytic copper foil has a yield strength more than or equal to 231 MPa and less than or equal to 300 MPa.

7 . The electrolytic copper foil as claimed in claim 3 , wherein the electrolytic copper foil has a yield strength more than or equal to 231 MPa and less than or equal to 300 MPa.

8 . The electrolytic copper foil as claimed in claim 4 , wherein the electrolytic copper foil has a yield strength more than or equal to 231 MPa and less than or equal to 300 MPa.

9 . The electrolytic copper foil as claimed in claim 5 , wherein the electrolytic copper foil has a yield strength more than or equal to 231 MPa and less than or equal to 300 MPa.

10 . The electrolytic copper foil as claimed in claim 1 , wherein the first surface has a root mean square height (Sq) more than or equal to 0.20 μm and less than or equal to 0.55 μm.

11 . The electrolytic copper foil as claimed in claim 5 , wherein the first surface has a root mean square height (Sq) more than or equal to 0.20 μm and less than or equal to 0.55 μm.

12 . The electrolytic copper foil as claimed in claim 6 , wherein the first surface has a root mean square height (Sq) more than or equal to 0.20 μm and less than or equal to 0.55 μm.

13 . The electrolytic copper foil as claimed in claim 10 , wherein the second surface has a root mean square height (Sq) more than or equal to 0.20 μm and less than or equal to 0.55 μm.

14 . The electrolytic copper foil as claimed in claim 11 , wherein the second surface has a root mean square height (Sq) more than or equal to 0.20 μm and less than or equal to 0.55 μm.

15 . The electrolytic copper foil as claimed in claim 12 , wherein the second surface has a root mean square height (Sq) more than or equal to 0.20 μm and less than or equal to 0.55 μm.

16 . The electrolytic copper foil as claimed in claim 13 , wherein an absolute difference of the Sq of the first surface and the Sq of the second surface of the electrolytic copper foil is less than 0.15 μm.

17 . The electrolytic copper foil as claimed in claim 14 , wherein an absolute difference of the Sq of the first surface and the Sq of the second surface of the electrolytic copper foil is less than 0.15 μm.

18 . The electrolytic copper foil as claimed in claim 15 , wherein an absolute difference of the Sq of the first surface and the Sq of the second surface of the electrolytic copper foil is less than 0.15 μm.

19 . An electrode of a lithium-ion cell, comprising the electrolytic copper foil as claimed in claim 1 .

20 . A lithium-ion cell, comprising the electrode as claimed in claim 19 .

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

• Wu Chih-Chung
• Lai Yao-Sheng
• Chou Jui-Chang

Classifications

• H01M4/134 Primary

  Electrodes based on metals, Si or alloys · CPC title

• H01M10/0525

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

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/661

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