Aluminum alloy foil for electrode collector and production method therefor

Patent metadata

Field	Value
Publication number	US-10916357-B2
Application number	US-201114235748-A
Country	US
Kind code	B2
Filing date	Jul 29, 2011
Priority date	Jul 29, 2011
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

An object of the present invention is to provide an aluminum alloy foil for an electrode current collector and a manufacturing method thereof, the foil having a high strength and high strength after a drying process after the application of the active material while keeping a high electrical conductivity. Disclosed is a method for manufacturing an aluminum alloy foil for electrode current collector, including: forming by continuous casting an aluminum alloy sheet containing 0.03 to 1.0% of Fe, 0.01 to 0.2% of Si, 0.0001 to 0.2% of Cu, with the rest being Al and unavoidable impurities, performing cold rolling to the aluminum alloy sheet at a cold rolling reduction of 80% or lower, and performing heat treatment at 550 to 620° C. for 1 to 15 hours.

First claim

The invention claimed is:

1. A positive electrode, comprising:
an electrode current collector comprising an aluminum foil consisting of 0.03 to 1.0 mass % (hereinafter referred to as %) of Fe, 0.01 to 0.2% of Si, 0.0001 to 0.2% of Cu, Al, and unavoidable impurities, and
lithium containing metal oxide provided on the electrode current collector,
wherein an electrical conductivity of the aluminum alloy foil is 57% IACS or higher, and a particle number of an intermetallic compounds having a maximum diameter length of 0.1 to 1.0 μm or longer is 1.0×10 4 particles/mm 2 or more; and
tensile strength of an original sheet after final cold rolling is preferably 180 MPa or higher, 0.2% yield strength thereof is preferably 160 MPa or higher, and tensile strength is 170 MPa or higher, and 0.2% yield strength is 150 MPa or higher even when heat treatment at 120° C. for 24 hours, at 140° C. for 3 hours, or at 160° C. for 15 minutes is performed.

2. A method for manufacturing the positive electrode of claim 1 , comprising the step of:
applying lithium containing metal oxide onto an aluminum alloy foil, wherein the aluminum alloy foil is obtained by the method comprising the steps of:
continuous casting an aluminum alloy sheet consisting of 0.03 to 1.0% of Fe, 0.01 to 0.2% of Si, 0.0001 to 0.2% of Cu, Al, and unavoidable impurities,
performing cold rolling to the aluminum alloy sheet at a cold rolling reduction of 80% or lower, and
performing heat treatment at 550 to 620° C. for 1 to 15 hours.

Assignees

• Seki Masakazu
• Suzuki Satoshi
• Yamamoto Kenji
• Furutani Tomohiko
• Uacj Corp

Inventors

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

Classifications

• C22F1/043

  of alloys with silicon as the next major constituent · CPC title

• B22D11/1206

  for plastic shaping of strands (rolling mills B21B1/46) · CPC title

• C22C1/026

  Alloys based on aluminium · CPC title

• B22D25/04

  Casting metal electric battery plates or the like (manufacture thereof by multi-step processes H01M4/82) · CPC title

• H01M4/662 Primary

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