Electrolytic copper foil having high tensile strength, electrode including the same, secondary battery including the same, and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10403898-B2
Application number	US-201715661266-A
Country	US
Kind code	B2
Filing date	Jul 27, 2017
Priority date	Jul 27, 2017
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A high strength electrolytic copper foil preventing generation of folds, wrinkles, pleats, and breaks during a roll-to-roll (RTR) process, a method of manufacturing the same, and an electrode and a secondary battery which allow high productivity to be secured by being manufactured with such an electrolytic copper foil. The electrolytic copper foil includes a copper film including 99 weight % or more of copper and a protective layer on the copper film, wherein the electrolytic copper foil has a tensile strength of 45 to 65 kgf/mm2.

First claim

What is claimed is:

1. A method of manufacturing an electrolytic copper foil, comprising:
applying electricity between a positive electrode plate and a rotating negative electrode drum which are disposed in an electrolyte to be spaced apart from each other in an electrolytic bath to form a copper film on the rotating negative electrode drum,
wherein the electrolyte includes in a range of 50 to 100 g/L of copper ions, 50 to 150 g/L of sulfuric acid, 0.5 to 6.5 ppm of imidazolidine-2-thione, and 0.2 to 5.5 ppm of silver (Ag).

2. The method of claim 1 , wherein the electrolyte further includes in a range of 3 to 7 ppm of sulfonate and 3 to 7 ppm of polymeric nitride.

3. The method of claim 1 , wherein:
the electrolyte is maintained at 40 to 60° C.; and
a current density provided by the positive electrode plate is in a range of 40 to 80 A/dm 2 .

4. The method of claim 1 , wherein, in the forming of the copper film, a flow rate of the electrolyte supplied into the electrolytic bath is in a range of 30 to 50 m 3 /hour, and a content of total organic carbon (TOC) in the electrolyte is maintained to be 0.3 g/L or less.

Assignees

• Ls Mtron Ltd
• Kcf Tech Co Ltd

Inventors

• Kim Seung Min
• Lee Jeong Gil
• Jin Shan Hua

Classifications

• C25D1/04

  Wires; Strips; Foils · CPC title

• C25D3/38

  of copper · CPC title

• 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

• C25D7/0614

  Strips or foils · CPC title