Electrolytic copper foil, negative electrode for lithium ion secondary battery, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-2016013493-A1
Application number	US-201314425346-A
Country	US
Kind code	A1
Filing date	Jun 25, 2013
Priority date	Jun 27, 2012
Publication date	Jan 14, 2016
Grant date	—

Abstract

Provided are an electrodeposited copper foil, a negative electrode that is for a lithium ion secondary battery, and a lithium ion secondary battery into which the electrode is incorporated. The electrodeposited copper foil exhibits good electrical conductivity and superior tensile strength, with no significant decline in tensile strength exhibited even after one hour of heating at 300° C. The negative electrode has heightened cycle properties due to the use of the electrodeposited copper foil as a current collector. Using x-ray diffraction, in the electrodeposited copper foil, in normal conditions, the diffraction intensity (I)<220> in the <220> orientation, the diffraction intensity (I)<200> in the <200> orientation, and the diffraction intensity (I)<111> in the <111> orientation, satisfy the following formula (1):
I <220>/{ I <220>+ I <200>+ I <111>}>0.13   (1).

First claim

1 . An electrodeposited copper foil, wherein, using x-ray diffraction, in normal conditions, a diffraction intensity I<220> thereof in a <220> orientation, a diffraction intensity I<200> thereof in a <200> orientation, and a diffraction intensity I<111> thereof in a <111> orientation, satisfy the following formula (1):
I< 220>/{ I< 220>+ I< 200>+ I< 111>}>0.13   (1).

2 . An electrodeposited copper foil, wherein, using x-ray diffraction, in normal conditions, a diffraction intensity I<220> thereof in a <220> orientation, a diffraction intensity I<200> thereof in a <200> orientation, and a diffraction intensity I<111> thereof in a <111> orientation, satisfy the following formula (2):
0.65> I< 220>/{ I< 220>+ I< 200>+ I< 111>}>0.13   (2).

3 . The electrodeposited copper foil according to claim 1 , wherein, in normal conditions, a tensile strength thereof is 450 MPa or greater.

4 . The electrodeposited copper foil according to claim 1 , wherein, in normal conditions, a tensile strength thereof is 500 MPa or greater.

5 . The electrodeposited copper foil according to claim 1 , wherein a tensile strength thereof after a heating process of one hour at 300° C. is 400 MPa or greater.

6 . The electrodeposited copper foil according to claim 1 , wherein, in normal conditions, electrical conductivity thereof is 80% IACS or greater.

7 . The electrodeposited copper foil according to claim 1 , wherein electrical conductivity thereof after a heating process of one hour at 300° C. is 85% IACS or greater.

8 . A negative electrode for a lithium ion secondary battery using the electrodeposited copper foil described in claim 1 as a current collector.

9 . A lithium ion secondary battery using the electrodeposited copper foil described in claim 1 as a negative electrode current collector.

10 . The electrodeposited copper foil according to claim 2 , wherein, in normal conditions, a tensile strength thereof is 450 MPa or greater.

11 . The electrodeposited copper foil according to claim 2 , wherein, in normal conditions, a tensile strength thereof is 500 MPa or greater.

12 . The electrodeposited copper foil according to claim 2 , wherein a tensile strength thereof after a heating process of one hour at 300° C. is 400 MPa or greater.

13 . The electrodeposited copper foil according to claim 2 , wherein, in normal conditions, electrical conductivity thereof is 80% IACS or greater.

14 . The electrodeposited copper foil according to claim 2 , wherein electrical conductivity thereof after a heating process of one hour at 300° C. is 85% IACS or greater.

15 . The electrodeposited copper foil according to claim 3 , wherein a tensile strength thereof after a heating process of one hour at 300° C. is 400 MPa or greater.

16 . The electrodeposited copper foil according to claim 3 , wherein, in normal conditions, electrical conductivity thereof is 80% IACS or greater.

17 . The electrodeposited copper foil according to claim 3 , wherein electrical conductivity thereof after a heating process of one hour at 300° C. is 85% IACS or greater.

18 . The electrodeposited copper foil according to claim 4 , wherein a tensile strength thereof after a heating process of one hour at 300° C. is 400 MPa or greater.

19 . The electrodeposited copper foil according to claim 4 , wherein, in normal conditions, electrical conductivity thereof is 80% IACS or greater.

20 . The electrodeposited copper foil according to claim 4 , wherein electrical conductivity thereof after a heating process of one hour at 300° C. is 85% IACS or greater.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Shinozaki Jun
• Fujisawa Kimiko
• Tachibana Akira

Classifications

• H01M10/0525

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

• H01M4/661 Primary

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

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• C25D7/0614

  Strips or foils · CPC title

• C25D1/04 Primary

  Wires; Strips; Foils · CPC title