Cathode current collector for electrical energy storage device and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-9837666-B2
Application number	US-201514933094-A
Country	US
Kind code	B2
Filing date	Nov 5, 2015
Priority date	Oct 20, 2011
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

Disclosed is a cathode current collector for an electrical energy storage device and a method for manufacturing the same, which improves adhesion between a current collector and an electrode material and provide a high reaction surface area, thereby improving the performance of the electrical energy storage. In particular, a first alumina film is formed on the surface of an aluminum foil using an anodic oxidation process. Next, the first alumina film formed on a surface of the aluminum foil is removed through etching and a second alumina film is formed on the surface of the aluminum foil, from which the first alumina film is removed, using the anodic oxidation process again. Subsequently, a carbon layer is coated on a surface of the aluminum foil on which the second alumina film is formed.

First claim

What is claimed is:

1. A method for manufacturing a cathode current collector, the method comprising:
forming a first alumina film on a surface of an aluminum foil using an anodic oxidation process;
removing the first alumina film formed on the surface of the aluminum foil through etching;
forming a second alumina film having a nanoporous structure on a surface of the aluminum foil, from which the first alumina film is removed, using the anodic oxidation process; and
coating a carbon layer on a surface of the aluminum foil on which the second alumina film is formed,
wherein the nanoporous structure is a nano-honeycomb structure,
wherein the carbon layer comprises a graphite.

2. The method of claim 1 , further comprising, prior to forming of the second alumina film, washing the aluminum foil, from which the first alumina film is removed, with deionized water and drying the resulting aluminum foil in a preheated oven.

3. A method for manufacturing a cathode for an electrical energy storage device, the method comprising:
forming a first alumina film on a surface of an aluminum foil using an anodic oxidation process;
removing the first alumina film formed on the surface of the aluminum foil by etching;
forming a second alumina film having a nanoporous structure on the surface of the aluminum foil, from which the first alumina film is removed, using the anodic oxidation process;
coating a carbon layer on the surface of the aluminum foil on which the second alumina film is formed; and
coating a cathode slurry on the surface of the carbon layer,
wherein the nanoporous structure is a nano-honeycomb structure,
wherein the carbon layer comprises a graphite.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Son Sam Ick
• Ryu Hee Yeon
• Jin Dae Gun

Classifications

• Y02P70/54

  Cross-Sectional Technologies · mapped topic

• H01M2004/028

  Positive electrodes · CPC title

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• H01M4/0442

  Anodisation, Oxidation (electrolytic coating by anodisation C25D9/00) · CPC title