Electrolytic copper foil, electrode comprising the same, and lithium ion battery comprising the same

Patent metadata

Field	Value
Publication number	US-2020119360-A1
Application number	US-201816203700-A
Country	US
Kind code	A1
Filing date	Nov 29, 2018
Priority date	Oct 16, 2018
Publication date	Apr 16, 2020
Grant date	—

Abstract

Provided are an electrolytic copper foil, an electrode comprising the same, and a lithium ion battery comprising the same. The electrolytic copper foil has a drum side and a deposited side opposing to the drum side, wherein a nanoindentation hardness of the drum side is equal to or larger than 0.5 GPa and equal to or smaller than 3.5 GPa; and a lightness of the drum side is equal to or larger than 25 and equal to or smaller than 75.

First claim

1 . An electrolytic copper foil comprising:
a drum side and a deposited side opposing to the drum side; wherein a nanoindentation hardness of the drum side is equal to or larger than 0.5 GPa and equal to or smaller than 3.5 GPa; and a lightness (L*) of the drum side is equal to or larger than 25 and equal to or smaller than 75, wherein the lightness (L*) belongs to one of three elements of the color system defined in JIS Z 8729.

2 . The electrolytic copper foil as claimed in claim 1 , wherein the nanoindentation hardness of the drum side is equal to or larger than 1.0 GPa and equal to or smaller than 3.0 GPa.

3 . The electrolytic copper foil as claimed in claim 1 , wherein a tensile strength of the electrolytic copper foil is equal to or larger than 34 kgf/mm 2 .

4 . The electrolytic copper foil as claimed in claim 1 , wherein the electrolytic copper foil further comprises at least one inorganic anti-corrosion layer formed on at least one of the drum side and the deposited side.

5 . The electrolytic copper foil as claimed in claim 4 , wherein the inorganic anti-corrosion layer comprises a chromate.

6 . The electrolytic copper foil as claimed in claim 1 , wherein the electrolytic copper foil further comprises at least one organic anti-corrosion layer-formed on at least one of the drum side and the deposited side.

7 . The electrolytic copper foil as claimed in claim 6 , wherein the organic anti-corrosion layer comprises an azole compound.

8 . An electrode for a lithium ion battery comprising: the electrolytic copper foil as claimed in claim 1 , a binder, and an active material.

9 . The electrode as claimed in claim 8 , wherein the active material comprises a carbon material, a silicon material, a metal, a metal oxide, a metal alloy, a polymer, or any combination thereof.

10 . A lithium ion battery comprising: a positive electrode, a negative electrode, and an electrolyte solution; wherein the negative electrode is the electrode as claimed in claim 8 .

11 . The electrolytic copper foil as claimed in claim 4 , wherein the at least one inorganic anti-corrosion layer is two inorganic anti-corrosion layers formed on both of the drum side and the deposited side.

12 . The electrolytic copper foil as claimed in claim 6 , wherein the at least one organic anti-corrosion layer is two organic anti-corrosion layers formed on both of the drum side and the deposited side.

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

• Lai Yao-Sheng
• Huang Jian-Ming
• Cheng Kuei-Sen
• Chou Jui-Chang

Classifications

• H01M4/661 Primary

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

• H01M10/0525

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

• H01M4/667

  in the form of layers, e.g. coatings · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/13

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