Copper foil, negative electrode current collector and negative electrode material for non-aqueous secondary battery

Patent metadata

Field	Value
Publication number	US-2015132658-A1
Application number	US-201314402501-A
Country	US
Kind code	A1
Filing date	May 21, 2013
Priority date	May 22, 2012
Publication date	May 14, 2015
Grant date	—

Abstract

An object of the present invention is to provide a copper foil inexpensive and sufficient in tensile strength even after heat treatment. The copper foil includes zinc in a content range of 0.02% by mass to 2.7% by mass in the total mass of the entire copper foil, and if the regions in thicknesses direction from both surfaces of the copper foil where occupies 5% by mass in the total mass of the entire copper foil are referred to as the respective external layers and a region between one external layer and the other external layer is referred to as an internal layer, the internal layer includes copper as a main element and includes 100 ppm or more of one or mixture of small amount-elements selected from carbon, sulfur, chlorine and nitrogen, and includes zinc at 10% or more in the total mass of zinc included in the entire copper foil.

First claim

1 . A copper foil including zinc in a content range of 0.02% by mass to 2.7% by mass in the total mass of the entire copper foil,
wherein the regions in thicknesses direction from both surfaces of the copper foil where occupies 5% by mass in the total mass of the entire copper foil are referred to as the respective external layers, and a region between one external layer and the other external layer is referred to as an internal layer, the internal layer comprises copper as a main element and includes 100 ppm or more of one or mixture of small amount-elements selected from carbon, sulfur, chlorine and nitrogen, and includes zinc at 10% or more in the total mass of zinc included in the entire copper foil.

2 . The copper foil according to claim 1 , wherein a grain size of copper in the internal layer is 1.0 micron-meters or less.

3 . The copper foil according to claim 1 , wherein the external layer of the copper foil has a concentrated zinc-layer higher in zinc content than the rest regions and occupying a part in the external layer.

4 . The copper foil according to claim 1 , wherein a compound composed of zinc and one or mixture of elements selected from carbon, sulfur, chlorine and nitrogen precipitates at a grain boundary of copper in the internal layer.

5 . The copper foil according to claim 1 , wherein a tensile strength is 40 kgf/mm 2 or more.

6 . A negative electrode current collector using a copper foil according to claim 1 .

7 . A negative electrode material of a non-aqueous secondary battery using a negative electrode current collector according to claim 6 .

Assignees

• Mitsui Mining & Smelting Co

Inventors

• Miyake Koichi
• Maeda Tomoyuki
• Hozumi Kazutaka
• Nakahara Hiroaki
• Yamauchi Shinichi

Classifications

• C23C28/021

  including at least one metal alloy layer · CPC title

• C25D1/04

  Wires; Strips; Foils · CPC title

• H01M10/0525

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

• C25D7/0614

  Strips or foils · CPC title

• C22C18/00

  Alloys based on zinc · CPC title