Aluminum alloy foil for electrode current collectors and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10050257-B2
Application number	US-201113995916-A
Country	US
Kind code	B2
Filing date	Dec 12, 2011
Priority date	Dec 20, 2010
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

An aluminum alloy foil for an electrode current collectors has a high post-drying strength after application of an active material while keeping a high electrical conductivity. The aluminum alloy foil includes 0.1 to 1.0 mass % of Fe, 0.01 to 0.5% of Si, and 0.01 to 0.2 mass % of Cu, and the rest includes Al and unavoidable impurities. The aluminum alloy foil after final cold rolling has a tensile strength of 220 MPa or higher, a 0.2% yield strength of 180 MPa or higher, and an electrical conductivity of 58% IACS or higher. The aluminum alloy foil has a tensile strength of 190 MPa or higher and a 0.2% yield strength of 160 MPa or higher after the aluminum alloy foil is heat treated at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.

First claim

The invention claimed is:

1. An electrode current collector formed by the steps of:
applying an active material onto an aluminum alloy foil obtained by final cold rolling of an aluminum alloy obtained by subjecting an aluminum alloy ingot, comprising 0.1 to 1.0 mass % of Fe, 0.01 to 0.5 mass % of Si, and 0.01 to 0.2 mass % of Cu, with the rest consisting of Al and unavoidable impurities, each of the unavoidable impurities being contained by 0.02 mass % or less, and a total amount of the unavoidable impurities being 0.15 mass % or less, to a homogenizing treatment at 550° C. to 620° C. for 3 to 6 hours, followed by a hot rolling, with a starting temperature of 500° C. to 550° C. and an end-point temperature of 255° C. to 300° C., and a cold rolling, wherein the aluminum alloy foil after the final cold rolling has a tensile strength of 220 MPa or higher, a 0.2% yield strength of 180 MPa or higher, and an electrical conductivity of 58% IACS or higher; and the aluminum alloy foil is capable of maintaining a tensile strength of 190 MPa or higher and a 0.2% yield strength of 160 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at 120° C. for 24 hours, at 140° C. for 3 hours, or at 160° C. for 15 minutes.

2. A method for manufacturing the electrode current collector according to claim 1 , comprising: subjecting an aluminum alloy ingot to homogenizing treatment at 550 to 620° C. for 3 to 6 hours; and performing hot rolling at a starting temperature of 500° C. to 550° C. and at an end-point temperature of 255 to 300° C.

3. The electrode current collector of claim 1 , wherein the aluminum alloy foil comprises 0.03 to 0.16 mass % of Cu.

4. The electrode current collector of claim 1 , wherein the aluminum alloy foil comprises 0.05 to 0.3 mass % of Si.

5. The electrode current collector of claim 1 , wherein the aluminum alloy foil comprises 0.3 to 0.8 mass % of Fe.

6. A method for manufacturing the electrode current collector according to claim 3 , comprising: subjecting an aluminum alloy ingot to homogenizing treatment at 550 to 620° C. for 3 to 6 hours; and performing hot rolling at a starting temperature of 500° C. to 550° C. and at an end-point temperature of 255 to 300° C.

7. A method for manufacturing the electrode current collector according to claim 4 , comprising: subjecting an aluminum alloy ingot to homogenizing treatment at 550 to 620° C. for 3 to 6 hours; and performing hot rolling at a starting temperature of 500° C. to 550° C. and at an end-point temperature of 255 to 300° C.

8. A method for manufacturing the electrode current collector according to claim 5 , comprising: subjecting an aluminum alloy ingot to homogenizing treatment at 550 to 620° C. for 3 to 6 hours; and performing hot rolling at a starting temperature of 500° C. to 550° C. and at an end-point temperature of 255 to 300° C.

Assignees

• Seki Masakazu
• Suzuki Satoshi
• Furutani Tomohiko
• Yamamoto Kenji
• Ashizawa Koichi
• Uacj Corp
• Uacj Foil Corp

Inventors

• Seki Masakazu
• Suzuki Satoshi
• Furutani Tomohiko
• Yamamoto Kenji
• Ashizawa Koichi

Classifications

• C22C21/00 Primary

  Alloys based on aluminium · CPC title

• H01M4/662

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

• H01M4/0471 Primary

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C22F1/04

  of aluminium or alloys based thereon · CPC title