Aluminum foil with carbonaceous particles dispersed and supported therein

Patent metadata

Field	Value
Publication number	US-9514887-B2
Application number	US-201013508397-A
Country	US
Kind code	B2
Filing date	Nov 11, 2010
Priority date	Nov 11, 2009
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

An object of the present invention is to provide an aluminum foil that can make a positive electrode current collector thinner for size reduction and higher energy density of electrical storage devices, be produced easily and has a low surface resistance. An aluminum foil of the present invention as a means for achieving the object is characterized in that carbonaceous particles are dispersed and supported therein. The aluminum foil with carbonaceous particles dispersed and supported therein of the present invention can be produced by electrolysis.

First claim

The invention claimed is:

1. A method for producing an aluminum foil with carbonaceous particles dispersed and supported therein, comprising:
forming an aluminum film with carbonaceous particles dispersed and supported therein on a surface of a substrate by electrolysis using a plating liquid containing carbonaceous particles dispersed therein;
after completing the electrolysis, removing the film from the substrate to obtain an aluminum foil with carbonaceous particles dispersed and supported therein; and
subjecting the foil to a heat treatment,
wherein the plating liquid is obtained by dispersing carbonaceous particles in a plating solution consisting essentially of (1) a dialkyl sulfone, (2) an aluminum halide, and (3) at least one nitrogen-containing compound selected from the group consisting of ammonium halides, hydrogen halide salts of primary amines, hydrogen halide salts of secondary amines, hydrogen halide salts of tertiary amines, and quaternary ammonium salts represented by the general formula: R 1 R 2 R 3 R 4 N.X (R 1 to R 4 independently represent an alkyl group and X represents a counteranion for the quaternary ammonium cation),
wherein the electrolysis is performed by applying a current density of 2-15 A/dm 2 to the plating liquid, and
wherein the heat treatment is performed by exposure to a heated atmosphere at 80-550° C., and the atmosphere is one of an air atmosphere, a reduced-pressure atmosphere, or an inert gas atmosphere.

2. A production method according to claim 1 , wherein the size of the carbonaceous particles is 1 nm to 100 μm.

3. A production method according to claim 1 , wherein the amount of the carbonaceous particles dispersed and supported in the aluminum foil with the carbonaceous particles dispersed and supported therein is 0.01 to 3.0 mass % of the aluminum foil with the carbonaceous particles dispersed and supported therein.

4. A production method according to claim 1 , wherein the aluminum foil with the carbonaceous particles dispersed and supported therein is used for an electrode.

5. The production method according to claim 1 , wherein the heat treatment is performed for 2-120 minutes.

Assignees

• Okamoto Atsushi
• Hoshi Hiroyuki
• Andou Setsuo
• Hitachi Metals Ltd

Inventors

• Okamoto Atsushi
• Hoshi Hiroyuki
• Andou Setsuo

Classifications

• C25D3/44

  Aluminium · CPC title

• H01M4/666

  in the form of mixed materials (H01M4/668 takes precedence) · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M4/661 Primary

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• C25D15/00

  Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires · CPC title