Electrolytic aluminum foil and method of manufacturing same

Patent metadata

Field	Value
Publication number	US-11035047-B2
Application number	US-201916418926-A
Country	US
Kind code	B2
Filing date	May 21, 2019
Priority date	Nov 22, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

The present disclosure provides a high-quality electrolytic aluminum foil which includes a smooth surface and an end portion containing no dendritic deposit, and a method for producing the same which can obtain the electrolytic aluminum foil at a high collection rate. An electrolytic aluminum foil of the present disclosure includes a surface having an arithmetic average height (Sa) of 0.15 μm or less, wherein when, for a size of a crystal grain present in a cross-sectional surface, a first maximum dimension as measured in a thickness direction of the cross-sectional surface is x (μm), and a second maximum dimension as measured in a width direction of the cross-sectional surface is y (μm), x and y satisfy (x+y)/2≤3 μm and 1≤x/y≤4.

First claim

What is claimed is:

1. An electrolytic aluminum foil comprising a surface having an arithmetic average height Sa of 0.15 μM or less, wherein the arithmetic average height Sa is a parameter obtained by three-dimensionally extending an arithmetic average roughness Ra, wherein the arithmetic average roughness Ra is a two-dimensional parameter,
wherein when, for a size of a crystal grain present in a cross-sectional surface, a first maximum dimension as measured in a thickness direction of the cross-sectional surface is x, and a second maximum dimension as measured in a width direction of the cross-sectional surface is y, x and y satisfy the following formulas (1) and (2):
( x+y )/2≤3 μm  (1); and

1≤ x/y≤ 4  (2).

2. A method for producing the electrolytic aluminum foil according to claim 1 ,
the method comprising:
supplying an electrolytic solution into an electrolysis vessel including a cathode and an anode;
electrodepositing an aluminum film on the cathode;
peeling off the electrodeposited aluminum film from the cathode to provide the electrolytic aluminum foil,
wherein the electrolytic solution contains a molten salt containing an alkyliniidazolium halide and an aluminum halide, and 1,10-phenanthroline;
a concentration of the 1,10-phenanthroline is 1 to 100 mM in the electrolytic solution;
its electrodepositing the aluminum film, a temperature of the electrolytic solution is 50 to 100° C., and a current density is 10 to 100 mA/cm 2 ; and
electrodepositing the aluminum film is performed under a condition where an inactive gas is injected at a flow rate of 50 to 250 cm/min between the cathode and the anode.

3. The method for producing the electrolytic aluminum foil according to claim 2 , wherein the inactive gas is argon.

4. The method for producing the electrolytic aluminum foil according to claim 2 , wherein an arithmetic average roughness (Ra) of the cathode is 0.10 to 0.40 μm.

Assignees

• Uacj Corp

Inventors

• Honkawa Yukio
• NUNOMURA Junji
• Kojima Yoichi
• Ui Koichi

Classifications

• C25D1/04 Primary

  Wires; Strips; Foils · CPC title

• C25D3/66

  from melts · CPC title

• C25D3/665

  from ionic liquids · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C25D1/00 Primary

  Electroforming · CPC title