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Electrolytic copper foil for negative electrode collector of secondary battery and method for producing the same

A negative electrode current collector, electrolytic copper foil technology, applied in the direction of electrode carrier/current collector, battery electrode, electrolysis process, etc., can solve the problems of current collector damage, reduced cycle characteristics, active material layer peeling, etc., to achieve high strength , the effect of excellent extensibility

Active Publication Date: 2017-08-29
JX NIPPON MINING & METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In such countermeasures, for the negative electrode in which the current collector and the active material layer are integrated, if charge and discharge are repeated, stress is applied to the current collector and the active material layer due to the severe expansion and contraction of the active material layer. In between, the active material layer may fall off, etc.
Or, the current collector may be destroyed and the cycle characteristics may be lowered.

Method used

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  • Electrolytic copper foil for negative electrode collector of secondary battery and method for producing the same
  • Electrolytic copper foil for negative electrode collector of secondary battery and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0048] In the electrolytic cell, a titanium rotating drum with a diameter of about 3133 mm and a width of 2476.5 mm is arranged, and electrodes are arranged around the drum with an inter-electrode distance of about 5 mm. A copper concentration: 90 g / L, a sulfuric acid concentration: 80 g / L, and a gel concentration: 3 mass ppm were introduced into the electrolytic cell to prepare an electrolytic solution. Further, adjust to electrolyte temperature: 60°C, current density: 85A / dm 2 , copper was deposited on the surface of the rotating drum, the copper deposited on the surface of the rotating drum was peeled off, and an electrolytic copper foil having a thickness of 10 μm and a surface roughness Ra of 1.6 μm was continuously produced.

Embodiment 1

[0050] The tensile strength of embodiment 1 is 62.3kg / mm 2 , the breaking stress is 59.6kg / mm 2 , the elongation rate is 7%, and the value of tensile strength is greater than the value of breaking stress.

[0051] When the cross-section of the electrodeposited copper foil of Example 1 was observed using EBSP, there were fine particles with an aspect ratio of less than 2.0 and columnar particles with an aspect ratio of 2.0 or more. The total area of ​​the columnar particles relative to the entire cross section was 31%. The average particle diameter of the fine particles was 0.2 μm.

[0052] For the electrodeposited copper foil of Example 1, when the tensile strength test was carried out based on IPC-TM-650 on the electrodeposited copper foil under the normal state (23°C) and after heating at 200°C for 30 minutes, respectively, after heating at 200°C for 30 minutes The tensile strength is 97% of the normal tensile strength.

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Abstract

The object of the present invention is to provide an electrolytic copper foil for secondary battery negative electrode current collectors and a manufacturing method thereof, especially a secondary battery negative electrode, which has high strength and is excellent in extensibility to withstand changes in expansion and contraction under fine cells. The electrolytic copper foil used for the current collector has a tensile strength of 45-70kg / mm2 in the nominal stress-strain curve, the value of the tensile strength is greater than the value of the fracture stress, and the elongation is more than 5%.

Description

technical field [0001] The invention relates to an electrolytic copper foil for a negative electrode collector of a secondary battery and a manufacturing method thereof. Background technique [0002] In recent years, lithium-ion secondary batteries have been used more and more in accordance with the high performance and multi-functionality of mobile devices. In the automotive field, the development of lithium-ion secondary batteries for vehicles has progressed. The current biggest problem of lithium ion secondary batteries used in these is to increase the capacity, and various countermeasures have been taken. A lithium ion battery has a positive electrode and a negative electrode in a nonaqueous and aqueous electrolyte solution, a positive electrode active material is bonded to the surface of a positive electrode current collector, and a negative electrode active material is bonded to the surface of a negative electrode current collector. [0003] In such countermeasures, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66C25D1/04C25D3/38
CPCC25D1/04C25D3/38H01M4/661H01M4/667H01M4/668H01M10/052Y02E60/10Y10T428/12431
Inventor 古曳伦也石井雅史森山晃正皆川洋一
Owner JX NIPPON MINING & METALS CORP
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