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Method for improving mechanical property of electrolytic copper foil and additive used by method

A technology of copper foil mechanics and electrolytic copper foil, which is applied in the field of lithium-ion batteries, can solve problems such as reduced tensile properties, weak mechanical properties, and difficult processes, and achieve the effects of enhanced orientation, grain refinement, and cost reduction

Active Publication Date: 2021-09-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the weak mechanical properties of the existing electrolytic copper foil, its tensile properties will decrease as its thickness decreases, and to strengthen the electrolytic copper foil in a targeted manner The process of mechanical properties generally has problems such as high cost and difficult process. The present invention provides a method for improving the mechanical properties of electrolytic copper foil, and provides the additives used

Method used

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  • Method for improving mechanical property of electrolytic copper foil and additive used by method
  • Method for improving mechanical property of electrolytic copper foil and additive used by method
  • Method for improving mechanical property of electrolytic copper foil and additive used by method

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Experimental program
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Effect test

Embodiment 1

[0055] The additive used in this embodiment is: sodium polydisulfide dipropane sulfonate, and the addition amount of the additive is: 0.01mol / L.

[0056] It is prepared by the process of industrial conventional copper foil preparation. The specific process is: control the current density to 5 A / m 2 .

[0057] The prepared electrolytic copper foil was tested according to the national standard GB / T-5230, and the test showed that the tensile strength of the prepared electrolytic copper foil was 476.6 MPa. In addition, Cu(111), Cu(200) and Cu(220) crystal plane texture coefficients were calculated, and the results are as follows figure 1 shown. In the figure: a is the smooth surface of the electrolytic copper foil (right column), b is the rough surface of the electrolytic copper foil (left column).

Embodiment 2

[0063] The specific operation is the same as in Example 1, except that the additive is polyethylene glycol.

[0064] The prepared electrolytic copper foil was tested according to the national standard GB / T-5230, and the test showed that the tensile strength of the prepared electrolytic copper foil was 451.45 MPa. The SEM characterization picture of the matte surface of the obtained electrolytic copper foil is as follows Figure 5 shown.

[0065] From Figure 5 It can be clearly seen that after the addition of alcohol additives, the surface of the electrolytic copper foil has a very obvious grain refinement, and as Figure 4 Disorderly bumps in the center are significantly reduced.

Embodiment 3

[0067] The specific operation is the same as in Example 1, except that the additives are 0.05 mol / L ether and 0.05 mol / L polyethyleneimine.

[0068] The prepared electrolytic copper foil was tested according to the national standard GB / T-5230, and the test showed that the tensile strength of the prepared electrolytic copper foil was 511.61 MPa. The SEM characterization picture of the matte surface of the obtained electrolytic copper foil is as follows Figure 6 shown.

[0069] From Figure 6 It can be clearly seen that after the addition of ether and amine additives, the copper foil grains obviously changed the growth direction, and produced a significant refinement, changed the texture characteristics of the copper foil, and significantly improved the copper foil texture. mechanical properties.

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Abstract

The invention relates to a method for improving the mechanical property of an electrolytic copper foil and an additive used by the method, and belongs to the field of lithium ion batteries. The method solves the problems that the mechanical property of the existing electrolytic copper foil is weak, the tensile property is reduced along with the reduction of the thickness, and the problems of high cost, high process difficulty and the like generally exist in a process for specifically strengthening the mechanical property of the electrolytic copper foil. According to the method for improving the mechanical property of the electrolytic copper foil, in the preparation process of the electrolytic copper foil, the crystal face growth trend of crystal grains in the copper foil is controlled, the (220) crystal face growth of copper crystal grains is promoted, the texture coefficient of copper grains on the (220) crystal face is increased, and / or cathodic polarization in the copper deposition process is increased, and the copper grains are refined. The method can effectively reduce cost and pollution; the modification treatment mode is simple and efficient, and extra procedures are omitted; the growth orientation of copper grains can be induced, and the orientation of the crystal face (220) is enhanced; and meanwhile, grain refinement can be realized, and the mechanical property of the copper foil is strengthened.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for improving the mechanical properties of electrolytic copper foil and additives used therein. Background technique [0002] Electrolytic copper foil is a kind of metal foil, which is an important raw material in the electronics and electrical industries. It is mainly used in the production of copper clad laminates, printed circuit boards and lithium batteries. With the miniaturization of electronic devices, the continuous development of printed circuit surface mount technology, and the increasing demand for multilayer printed circuit boards, less defects, fine grains, lower roughness, high strength, good ductility, and ultra-thin high performance Electrolytic copper foil will be widely used. [0003] The performance of electrolytic copper foil mainly depends on their structure and impurity content. To obtain high-quality copper foil, it is necessary to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/04C30B7/12C30B29/02
CPCC25D1/04C30B7/12C30B29/02Y02E60/10
Inventor 唐谊平江晨浩张建力陈强侯广亚
Owner ZHEJIANG UNIV OF TECH
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