Method for producing electrolytic aluminum foil

Patent metadata

Field	Value
Publication number	US-10590555-B2
Application number	US-201715825794-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Sep 5, 2015
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

A method for producing high quality electrolytic aluminum foil excellent in peelability from a cathode surface is provided. A method for producing electrolytic aluminum foil according to the present disclosure is a method for producing electrolytic aluminum foil, comprising steps of depositing an aluminum film on a surface of a cathode in an electrolytic cell supplied with an electrolytic solution and comprising the cathode; and peeling the deposited aluminum film from the surface of the cathode to provide aluminum foil, wherein the cathode has surface roughness of an arithmetic average roughness (Ra) of 0.10 to 0.40 μm and a ten-point average roughness (Rz) of 0.20 to 0.70 μm.

First claim

What is claimed is:

1. A method for producing electrolytic aluminum foil, comprising:
depositing an aluminum film on a surface of a cathode in an electrolytic cell supplied with an electrolytic solution and wherein the electrolytic cell comprises the cathode; and
peeling the deposited aluminum film from the surface of the cathode to provide aluminum foil, wherein
the cathode has surface roughness of an arithmetic average roughness (Ra) of 0.10 to 0.40 μm and a ten-point average roughness (Rz) of 0.20 to 0.70 μm,
the depositing is conducted at a current density is 10 to 100 mA/cm 2 , and
an average grain diameter is in a range of 1.00 μm or more and 5.00 μm or less at any site n the aluminum foil.

2. The method for producing electrolytic aluminum foil according to claim 1 , wherein the cathode is a drum made of titanium.

3. The method for producing electrolytic aluminum foil according to claim 1 , wherein the electrolytic solution is a molten salt containing 0.01 to 0.5 g/L of 1-10 phenanthroline monohydrate,
in the aluminum foil, an arithmetic average roughness Ra of a foil surface is in a range of 0.10 μm or more and 2.50 μm or less at any site.

4. The method for producing electrolytic aluminum foil according to claim 3 , wherein a difference in the arithmetic average roughness Ra of the foil surface measured in a central portion in a width direction and the arithmetic average roughness Ra measured in an end portion in the width direction on the foil surface is 2.00 μm or less.

5. The method for producing electrolytic aluminum foil according to claim 1 , wherein the electrolytic solution is a molten salt containing an alkylimidazolium halide and an aluminum halide, or a molten salt containing an alkylpyridinium halide and an aluminum halide.

6. The method for producing electrolytic aluminum foil according to claim 1 , further comprising adjusting, the surface roughness of the cathode by electropolishing.

Assignees

• Uacj Corp

Inventors

• Honkawa Yukio
• NUNOMURA Junji
• Kojima Yoichi

Classifications

• C25D1/04 Primary

  Wires; Strips; Foils · CPC title

• C25D3/665

  from ionic liquids · CPC title

• C25D1/20

  Separation of the formed objects from the electrodes {with no destruction of said electrodes} · CPC title

• C25D3/44

  Aluminium · CPC title