Anode for secondary battery, anode current collector, production method thereof, and secondary battery

Patent metadata

Field	Value
Publication number	US-9293771-B2
Application number	US-201213729470-A
Country	US
Kind code	B2
Filing date	Dec 28, 2012
Priority date	Jun 30, 2010
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A chargeable and dischargeable secondary battery for use in electronic devices, industrial machines, electric-powered vehicles, is provided, along with an anodic electrode and a copper foil for anode current collector.
It is an anode for secondary battery that utilizes non-aqueous electrolyte, which comprises a silicon-type active material film formed on one side or both sides of a current collector made of copper foil or copper alloy foil, wherein 1 g/m 2 to 14 g/m 2 of silicon-type active material film is formed on said current collector, and the lightness Y value in a XYZ colorimetric system (CIE 1931 standard colorimetric system) for the surface of said anode, onto which said silicon-type active material film is formed, is 15 to 50, and the surface roughness (ten point average roughness) Rz specified by the Japanese Industrial Standards (JIS B0601-1994 ten point average roughness) is 1.0 μm or more and 4.5 μm or less.

First claim

The invention claimed is:

1. An anode for a secondary battery, the secondary battery comprising a non-aqueous electrolyte, the anode comprising:
a current collector made of copper foil or copper alloy foil;
at least one heat-resistant layer comprising at least a layer containing 0.01 to 0.2 g/m 2 of nickel or a layer containing 0.003 to 0.05 g/ma of zinc on one or both sides of said current collector;
at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer formed on said at least one heat-resistant layer; and
a silicon-containing active material film formed on-the at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer;
wherein:
1 g/m 2 to 14 g/m 2 of said silicon-containing active material film is formed on said at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer;
said silicon-containing active material film has a surface, which is an anode surface;
the anode surface has a lightness Y value in a XYZ CIE 1931 standard colorimetric system from 15 to 50; and
the anode surface has a surface roughness Rz specified as a ten point average roughness by the Japanese Industrial Standards JIS B0601-1994, and Rz is 1.0 μm or more and 4.5 μm or less.

2. The anode according to claim 1 , wherein said silicon-containing active material contains at least one of phosphorus or oxygen.

3. The anode according to claim 1 , wherein said silicon-containing active material film further contains hydrogen.

4. The anode according to claim 1 , wherein the zinc in said heat-resistant layer is diffused into said current collector.

5. The anode according to claim 1 , wherein (said at least one silicon-containing active material film is formed by coating and solidifying a slurry of active material particulates and)
a tensile strength of said current collector is 300 MPa or more and 1000 MPa or less;
said current collector has a surface lightness Y value in a XYZ CIE 1931 standard colorimetric system from 20 to 50; and
said current collector has a surface roughness Rz specified as a ten point average roughness by the Japanese Industrial Standards JIS B0601-1994, and Rz is 0.6 μm or more and 3.5 μm or less.

6. The anode according to claim 1 , wherein the non-aqueous electrolyte is an electrolyte solution comprising a non-aqueous solvent containing fluoride.

7. An anode for a secondary battery, the secondary battery comprising a non-aqueous electrolyte, the anode comprising:
a current collector made of copper foil or copper alloy foil;
at least one heat-resistant layer comprising at least a layer containing 0.01 to 0.2 g/m 2 of nickel or a layer containing 0.003 to 0.05 g/ma of zinc on one or both sides of said current collector;
at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer formed on said at least one heat-resistant layer; and
a silicon-containing active material film formed on-the at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer;
wherein:
1 g/m 2 to 14 g/m 2 of said silicon-containing active material film is formed on said at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer;
said silicon-containing active material film has a surface, which is an anode surface;
the anode surface has a lightness Y value in a XYZ CIE 1931 standard colorimetric system from 15 to 50; and
the anode surface has a surface roughness Rz specified as a ten point average roughness by the Japanese Industrial Standards JIS B0601-1994, and Rz is 1.0 μm or more and 4.5 μm or less,
a tensile strength of said current collector is 300 MPa or more and 1000 MPa or less;
said current collector has a surface lightness Y value in a XYZ CIE 1931 standard colorimetric system from 10 to 40; and
said current collector has a surface roughness Rz specified as a ten point average roughness by the Japanese Industrial Standards JIS B0601-1994, and Rz is 2.0 μm or more and 5.0 μm or less.

8. A method for producing an anode for a secondary battery, comprising: providing a current collector which is made of copper foil or copper alloy foil having a tensile strength of 300 MPa or more and 1000 MPa or less;
performing electroplating on one or both surfaces of the current collector to thereby obtain a roughened surface having a surface roughness Rz, specified as a ten point average roughness by the Japanese Industrial Standards JIS 60601-1994, which is 2.0 μm or more and 5.0 μm or less and the surface has a lightness Y value in a XYZ CIE 1931 standard colorimetric system from 10 to 40;
forming at least one heat-resistant layer that contains at least nickel or zinc, on the roughened surface;
forming at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling layer on top of said heat-resistant layer; and
forming a silicon-containing active material film by forming 1 g/m 2 to 14 g/m 2 of a silicon-containing active material, optionally comprising phosphorus, oxygen, or hydrogen, on the at least one layer selected from the group consisting of an anti-corrosion layer and a silane coupling treatment layer, wherein:
said silicon-containing active material film has a surface, which is an anode surface;
the anode surface has a lightness Y value in a XYZ CIE 1931 standard colorimetric system from 15 to 50; and
the anode surface has a surface roughness Rz specified as a ten point average roughness by the Japanese Industrial Standards JIS B0601-1994, and Rz is 1.0 μm or more and 4.5 μm or less.

9. The method of claim 8 , wherein said silicon-containing active material film is formed by a chemical vapor deposition method, an electron beam vapor depositing method, or a sputtering method.

10. The method of claim 8 , wherein said silicon-containing active material layer is formed by a slurry application-calcination method.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Tani Toshio
• Yoshinari Kiyoshi
• Suzuki Akitoshi
• Shinozaki Kensaku

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title