Copper foil and current collector for lithium ion secondary battery and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2025279435-A1
Application number	US-202519067026-A
Country	US
Kind code	A1
Filing date	Feb 28, 2025
Priority date	Mar 1, 2024
Publication date	Sep 4, 2025
Grant date	—

Abstract

Provided is an copper foil for lithium ion secondary batteries having two opposite sides, wherein the copper foil has a texture coefficient of crystal plane (220) “TC (220)” of ≥1.36 and a texture coefficient of crystal plane (311) “TC (311)” of ≥0.79. The present disclosure further provides a current collector for lithium ion secondary batteries and a lithium ion secondary battery including the same.

First claim

1 . A copper foil for lithium ion secondary batteries, having two opposite sides, wherein the copper foil has a texture coefficient of the crystal plane (220) (TC(220)) of ≥1.36 and a texture coefficient of the crystal plane (311) (TC(311)) of ≥0.79.

2 . The copper foil of claim 1 , wherein the TC(220) is ranging from 1.36 to 2.75, and the TC(311) is ranging from 0.79 to 1.10.

3 . The copper foil of claim 1 , wherein the copper foil has a rate of TC(220) change of <5% after being heated at 200° C. in a vacuum for 5 hours.

4 . The copper foil of claim 1 , wherein the copper foil has a rate of TC(311) change of <6% after being heated at 200° C. in a vacuum for 5 hours.

5 . The copper foil of claim 1 , wherein the copper foil has a tensile strength of ≥50 kg/mm 2 .

6 . The copper foil of claim 1 , wherein the copper foil has a tensile strength of ≥50 kg/mm 2 after being heated at 200° C. in a vacuum for 5 hours.

7 . The copper foil of claim 2 , wherein the copper foil has a tensile strength deterioration rate of ≤10% after being heated at 200° C. in a vacuum for 5 hours.

8 . The copper foil of claim 1 , which is a surface-treated copper foil comprising a copper layer and a rust-proof layer.

9 . The copper foil of claim 8 , wherein the rust-proof layer is on at least one surface of the copper layer, and the rust-proof layer is formed from an organic material or an inorganic material.

10 . The copper foil of claim 9 , wherein the inorganic material comprises at least one selected from the group consisting of chromium, nickel, zinc, cobalt, manganese, and tin.

11 . The copper foil of claim 9 , wherein the organic material comprises at least one selected from the group consisting of carbon, oxygen, nitrogen, sulfur, and silicon.

12 . The copper foil of claim 11 , wherein the organic material comprises at least one selected from the group consisting of porphyrin group, silane group, benzotriazole and triazine trithiol.

13 . A current collector for lithium ion secondary batteries, comprising the copper foil of claim 1 .

14 . A lithium ion secondary battery, comprising the current collector of claim 13 .

Assignees

• Chang Chun Petrochemical Co Ltd

Inventors

• Chou Jui-Chang
• Yang Wen-Ting
• Huang Chien-Ming

Classifications

• H01M10/0525

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

• H01M4/661 Primary

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/667

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