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A kind of preparation method of porous copper foil for current collector of lithium ion capacitor

A technology for current collectors and capacitors, which is applied in the field of preparation of porous copper foil for current collectors of lithium-ion capacitors, can solve the problems of unsuitable industrial use, complicated preparation process, and low yield rate, and achieve low energy consumption, wide sources, and simple process Effect

Active Publication Date: 2018-05-25
西科微纳(重庆)新能源技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain porous copper foil, the preparation process is complicated and many process parameters of electrodeposition need to be controlled. After deposition, it needs to be peeled off from the surface of the cathode body, and the yield is low.
However, the Chinese invention patent CN104057099A hydrothermally prepared porous copper foil is only 1-3um thick and cannot be used industrially at all.
3) Heat treatment method, such as the Chinese invention patent CN 105018776A, which dezincifies brass alloy flakes under vacuum and high temperature to obtain porous alloys. This method requires a vacuum and high temperature environment and consumes a lot of energy. The raw material is brass alloy flakes, which is not common in the market. Pure copper current collector copper foil, there are great problems in the source of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing a porous copper foil for a current collector of a lithium-ion capacitor, using a commercially available copper foil for a battery-level current collector with a thickness of 30um as a raw material, the copper foil is a coil material, and a direct current electrolytic oxidation method is adopted ,Proceed as follows:

[0031] A) Using inert graphite as a cathode and using the copper foil as an anode to pretreat the copper foil to form pores. During the pretreatment process, the electrolytic cell is equipped with hydrochloric acid with a concentration of 5mol / L at a temperature of 50°C, and a DC electrolytic current density of 0.7A / cm 2 , time 10s.

[0032] B) Cleaning the above-mentioned treated copper foil with industrial deionized water.

[0033] C) After cleaning, the copper foil is electrolytically enlarged with the inert graphite as the cathode and the copper foil as the anode. In the process of electrolytic pore expansion, the electrolytic ...

Embodiment 2

[0038] A method for preparing a porous copper foil for a lithium-ion capacitor current collector. The commercially available copper foil for a battery-grade current collector with a thickness of 15um is used as a raw material, and the copper foil is a coil material, and the direct current electrolytic oxidation method is adopted ,Proceed as follows:

[0039] A) Using inert graphite as a cathode and using the copper foil as an anode to pretreat the copper foil to form pores. During the pretreatment process, the electrolytic cell is equipped with hydrochloric acid with a concentration of 3mol / L at a temperature of 50°C, and a DC electrolytic current density of 0.7A / cm 2 , time 5s.

[0040] B) Cleaning the above-mentioned treated copper foil with industrial deionized water.

[0041] C) After cleaning, the copper foil is electrolytically enlarged with the inert graphite as the cathode and the copper foil as the anode. In the process of electrolytic pore expansion, the electroly...

Embodiment 3

[0046] A method for preparing a porous copper foil for a current collector of a lithium-ion capacitor, using a commercially available copper foil for a battery-level current collector with a thickness of 8um as a raw material, the copper foil is a coil material, and a direct current electrolytic oxidation method is adopted ,Proceed as follows:

[0047] A) Using inert graphite as a cathode and using the copper foil as an anode to pretreat the copper foil to form pores. During the pretreatment process, the electrolytic cell is equipped with hydrochloric acid with a concentration of 3mol / L at a temperature of 50°C, and a DC electrolytic current density of 0.3A / cm 2 , time 5s.

[0048] B) Cleaning the above-mentioned treated copper foil with industrial deionized water.

[0049] C) After cleaning, the copper foil is electrolytically enlarged with the inert graphite as the cathode and the copper foil as the anode. In the process of electrolytic pore expansion, the electrolytic ce...

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Abstract

The invention relates to the field of capacitor manufacturing, and discloses a method for preparing a porous copper foil for a lithium ion capacitor current collector. Copper foil is used as a raw material, and a direct current electrolytic oxidation method is adopted. The steps are as follows: A) using inert graphite as a cathode, and using the The copper foil is used as the anode to pretreat the copper foil to make holes; B) the copper foil after the above treatment is cleaned; C) after cleaning, the copper foil is electrolytically expanded with the inert graphite as the cathode and the copper foil as the anode. D) After the above-mentioned treated copper foil is subjected to secondary cleaning, post-treatment electrolysis, and three cleanings, the porous copper foil is produced. The method of the invention has simple process and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of capacitor manufacturing, in particular to a method for preparing a porous copper foil for a lithium ion capacitor current collector. Background technique [0002] Lithium-ion capacitors have the advantages of large capacity, high voltage, high power, and long service life. They are a promising emerging green energy storage device. Lithium-intercalable materials similar to lithium-ion batteries. [0003] Since the lithium ion capacitor negative electrode material needs to pre-intercalate lithium, the capacitor positive electrode and negative electrode current collector must have pores that allow lithium ions to pass through. [0004] At present, the manufacturing methods of porous copper foil mainly include the following types: 1) mechanical punching, such as the Japanese invention patent (public publication No. 8-124575). The aperture of the porous copper foil produced by this method is generally not less than 50...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/84H01G11/68
CPCY02E60/13
Inventor 刘祝英张晶晶
Owner 西科微纳(重庆)新能源技术研究院有限公司
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