Rolled copper foil for secondary battery negative electrode current collectors, secondary battery negative electrode current collector and secondary battery each using same, and method for manufacturing rolled copper foil for secondary battery negative electrode current collectors

A negative electrode current collector and secondary battery technology, applied in the field of rolled copper foil, can solve the problems of poor cycle characteristics and falling off of active materials

Pending Publication Date: 2021-10-19
JX NIPPON MINING & METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, during repeated use, there is a problem that the active material is easil

Method used

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  • Rolled copper foil for secondary battery negative electrode current collectors, secondary battery negative electrode current collector and secondary battery each using same, and method for manufacturing rolled copper foil for secondary battery negative electrode current collectors
  • Rolled copper foil for secondary battery negative electrode current collectors, secondary battery negative electrode current collector and secondary battery each using same, and method for manufacturing rolled copper foil for secondary battery negative electrode current collectors
  • Rolled copper foil for secondary battery negative electrode current collectors, secondary battery negative electrode current collector and secondary battery each using same, and method for manufacturing rolled copper foil for secondary battery negative electrode current collectors

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[0057] Example

[0058] Next, the rolling copper foil of the present invention was tried to confirm its performance. However, the description here is not intended to be limited to this.

[0059] First, the molten composition having a composition of Cu-0.20% by mass Sn was melted, and the ingot was hot rolled from 900 ° C to give a plate having a thickness of 100 mm. Thereafter, a rolling copper foil having a thickness of 10 μm was finally obtained by the final cold rolling step under the respective diamond conditions shown in Table 1. "-" in the table means that there is no processing.

[0060] For each test piece thus obtained, the following characteristic evaluation is performed. The results are shown in Table 2.

[0061]

[0062] A test piece of 100 mm in length direction, a width direction is 12.7 mm, followed by IPC-TM-650 test method 2.4.18, tensile testing in parallel with the rolling direction, followed by JIS Z 2241, analyzed 0.2% yield strength.

[0063]

[0064] A tes...

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Abstract

The purpose is to provide a rolled copper foil for secondary battery negative electrode current collectors, whereby it becomes possible to satisfactorily prevent the plastic deformation and breakage of a copper foil which may be caused by the generation of a stress in association with the change in volume of an active material or the like. A rolled copper foil for secondary battery negative electrode current collectors, which contains Sn in an amount of 0.2 to 2.0% by mass and has tensile strength of 650 MPa or more and an elongation at break of 1.0% or more.

Description

technical field [0001] The present invention relates to a rolled copper foil for a secondary battery negative electrode current collector, a secondary battery negative electrode current collector and a secondary battery using the copper foil, and production of a rolled copper foil for a secondary battery negative electrode current collector method. Background technique [0002] Lithium ion secondary batteries have characteristics of high energy density and high voltage compared with other secondary batteries. Therefore, it is being developed in various small electronic equipment batteries, power supplies for driving large equipment such as electric vehicles, and the like. [0003] A lithium ion secondary battery is composed of a positive electrode, a negative electrode, and a separator. The positive electrode is formed of an aluminum foil current collector and a lithium oxide-based active material coated on its surface, and the negative electrode is formed of a copper foil...

Claims

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Application Information

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IPC IPC(8): C22C9/02C22F1/00C22F1/08H01M4/66
CPCC22C9/02C22F1/08H01M4/66C22F1/00Y02E60/10B21B1/40C21D8/0226C21D8/0236C21D8/0273
Inventor 冈部史弥
Owner JX NIPPON MINING & METALS CO LTD
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