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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

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

AI Technical Summary

Problems solved by technology

Therefore, during repeated use, there is a problem that the active material is easily detached from the current collector and the cycle characteristics are deteriorated.

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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Embodiment

[0058] Next, the rolled copper foil of the present invention was manufactured in an attempt, and the performance thereof was confirmed, which will be described below. However, the description here is for the purpose of illustration only, and is not intended to be limited thereto.

[0059] First, an ingot having a composition of Cu-0.20% by mass Sn was melt-produced, and the ingot was hot-rolled from 900° C. to obtain a plate with a thickness of 100 mm. Thereafter, a rolled copper foil having a thickness of 10 μm was finally obtained through the final cold rolling process under the conditions of each pass of A to I shown as an example in Table 1. "-" in the table means no processing.

[0060] The following characteristic evaluations were performed on each of the test pieces thus obtained. The results are shown in Table 2.

[0061]

[0062] Make a test piece with a length of 100 mm and a width of 12.7 mm, and perform a tensile test using a tensile testing machine parallel t...

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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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