Metallic foil manufacturing method and cathode for manufacturing metallic foil

Patent metadata

Field	Value
Publication number	US-10900138-B2
Application number	US-201716328509-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Jan 25, 2017
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

Provided are a metallic foil manufacturing method in which a metallic film electrodeposited by electrolysis on the surface of an electrodeposition surface of a cathode is peeled off to form a metallic foil, and the electrodeposition surface used therein is obtained by subjecting a roughened surface, which results from roughening a smoothed surface made of titanium or titanium alloy using a blast treatment, etc., to an oxidation treatment selected from thermal oxidation, anodic oxidation (preferably anodic oxidation carried out while moving the anodic oxidation solution), or a combination treatment of thermal oxidation and anodic oxidation so that the electrodeposition surface has an oxidation layer with a thickness of 30 to 250 nm on the uppermost layer and has a surface roughness RZJIS of 4 to 10 μm.

First claim

The invention claimed is:

1. A method for manufacturing a metallic foil comprising
forming an electrodeposition surface on a surface of a cathode by:
performing a roughening treatment on a smoothed surface made of titanium or titanium alloy to form a roughened surface; and
performing an oxidation treatment selected from the group consisting of thermal oxidation, anodic oxidation, and a combination treatment of thermal oxidation and anodic oxidation, the oxidation treatment being performed on the roughened surface to form an oxidation layer with a thickness of 30 nm to 250 nm on an outermost layer,
the electrodeposition surface having:
a center portion in a width direction of the cathode, the center portion corresponding to a product portion of the metallic foil and having a surface roughness R ZJIS of 4 μm to 10 μm; and
adjacent portions on both sides of the center portion, the adjacent portions having a surface roughness R ZJIS of 2.5 μm or less,

electrodepositing a metallic film by electrolysis on the electrodeposition surface, and peeling the metallic film from the electrodeposition surface to obtain the metallic foil.

2. The method for manufacturing a metallic foil according to claim 1 ,
wherein the oxidation treatment is anodic oxidation and the anodic oxidation is performed while moving an anodic oxidation solution in contact with the roughened surface.

3. The method for manufacturing a metallic foil according to claim 2 ,
wherein the anodic oxidation is performed while moving the anodic oxidation solution in contact with the roughened surface by one selected from the group consisting of a means for applying a liquid flow, a means for applying ultrasonic waves, and a combination of the means for applying a liquid flow and the means for applying ultrasonic waves.

4. The method for manufacturing a metallic foil according to claim 1 , wherein
an immersing treatment is performed on the roughened surface as a pre-treatment for the oxidation treatment, the immersing treatment being selected from the group consisting of an immersing treatment in an alkaline solution, an immersing treatment in a strongly acidic solution, and a combination treatment of the immersing treatment in the alkaline solution and the immersing treatment in the strongly acidic solution.

5. The method for manufacturing a metallic foil according to claim 1 , wherein the roughening treatment is a blast treatment.

6. The method for manufacturing a metallic foil according to claim 1 , wherein the electrodeposition surface has a ratio of a width of each adjacent portion to a width of the center portion of 0.1% to 10%.

Assignees

• Hitachi Metals Ltd

Inventors

• Matsuda Junichi
• Okamoto Atsushi

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M4/667

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

• H01M4/662

  Alloys (collectors of lead alloys H01M4/685) · CPC title

• C23C8/02

  Pretreatment of the material to be coated (C23C8/04 takes precedence) · CPC title

• C23C8/40

  using liquids, e.g. salt baths, liquid suspensions · CPC title