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Rolled copper foil for secondary battery current collector and manufacturing method thereof

A technology of rolling copper foil and secondary battery, applied in the direction of secondary battery, battery electrode, electrode carrier/current collector, etc., can solve the problems of peeling, large expansion and shrinkage, and achieve the effect of preventing plastic deformation and improving capacity

Active Publication Date: 2016-08-17
FURUKAWA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these new active materials have a problem of being peeled off from the current collector during use because the amount of expansion and contraction associated with charging and discharging is larger than that of carbon-based materials.

Method used

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  • Rolled copper foil for secondary battery current collector and manufacturing method thereof
  • Rolled copper foil for secondary battery current collector and manufacturing method thereof
  • Rolled copper foil for secondary battery current collector and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0153] Specific examples of the present invention will be described below.

[0154] The results of the examples are shown in Tables 2 to 6 below.

[0155]The evaluation results of the Cu-(Cr, Zr) system examples are shown in Table 2, the evaluation results of the Cu-Ag system examples are shown in Table 3, and the evaluation results of the Cu-Sn system examples are shown in Table 4. Cu - Table 5 shows the evaluation results of Ni-Si based examples, and Table 6 shows the evaluation results of pure copper based examples.

[0156] In Tables 2 to 6, the evaluation results of the above (1) to (5) copper alloy examples are compared with the reference examples and comparative examples.

[0157] Before describing the evaluation of the results of these Examples in Tables 2 to 6, the manufacturing method of the rolled copper foil of the present embodiment and the comparative example, the evaluation method of the rolled copper foil before roughening plating, the battery evaluation metho...

Embodiment 5-1、5-2

[0352] Examples 5-1 and 5-2 satisfy the condition that the area ratio [S(111) / S(100)] is 2 or less.

[0353] Since the 0.2% proof strength (YS) of Examples 5-1 and 5-2 is 400 MPa or more, it is presumed that the limit elastic deformation can be increased.

[0354] Furthermore, in Examples 5-1 and 5-2, based on the initial charge capacity of battery evaluation 1 and the maintenance rate value of battery evaluation 2, it can be seen that the characteristics of the battery evaluation are good.

[0355] The area ratio [S(111) / S(100)] of Comparative Example 5-21 was 2.09, and the condition of 2 or less was not satisfied.

[0356] Moreover, the initial charging capacity of Comparative Example 5-21 battery evaluation 1 is 383mAh, which is lower than the 448mAh of Example 5-1 of this example, and the maintenance rate of battery evaluation 2 is 11%, which is 11% of 29% of Example 5-1. / 3 or so.

[0357] As such, the battery evaluation characteristics of Comparative Example 5-21 were ...

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Abstract

Provided are: a rolled copper foil for a secondary battery collector, that is unlikely to plastically deform due to having a large amount of elastic deformation and whereby yield in the production process for batteries, etc., and electrical characteristics can be improved; and a production method therefor. The rolled copper foil (20) for secondary battery collectors comprises copper or coppery alloy formed by rolling and has an area ratio [S(111) / S(100)] of no more than 2 between an areal proportion (S (111)) for a region wherein the surface faces a rolling direction (111) relative to crystal orientation and an areal proportion (S(100)) for a region wherein the surface faces a rolling direction (100).

Description

technical field [0001] The present invention relates to a rolled copper foil applicable to a secondary battery current collector and a manufacturing method thereof, in particular to a rolled copper foil with an enlarged elastic limit and a manufacturing method thereof. Background technique [0002] Rolled copper foil is used for negative electrode current collectors of secondary batteries such as lithium ion batteries, and is used by coating, for example, a carbon-based active material. This negative electrode current collector is produced by coating the active material on rolled copper foil by roll pressing. However, when the roll is used for rolling, there are problems such as loss of the copper foil deformation active material, or a decrease in yield due to a shape defect. This problem has become more prominent as current collectors have become thinner in recent years. [0003] In addition, with the increase in battery capacity requirements in recent years, the research...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C9/02C22C9/04C22C9/05C22C9/06C22C9/10C22F1/08H01M4/66C22F1/00
CPCC22C9/00C22C9/02C22C9/06C22C19/03C22C21/00C22F1/00C22F1/08H01M4/661H01M10/0525Y02E60/10
Inventor 金子洋江口立彦五十岚稔三谷洋二
Owner FURUKAWA ELECTRIC CO LTD