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A kind of copper foil with graphene film on the surface and preparation method thereof

A graphene film and graphene technology, applied in the direction of coating, electrolytic coating, electrolytic inorganic material coating, etc., can solve the problems of poor conductivity of chromium oxide, low temperature resistance of organic film layer, and containing, etc., to achieve good conductivity, good function, the effect of increasing viscosity

Active Publication Date: 2021-09-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The defect of this process is that the reaction system contains hexavalent chromium, which is easy to cause environmental pollution problems
At the same time, the conductivity of chromium oxide is very poor. If the amount is too large, the conductivity of the copper foil surface will be significantly reduced.
[0004] The chromium-free passivation process usually makes the surface of the copper foil covered by an organic film layer. The disadvantage of this anti-corrosion and anti-oxidation process is that the organic film layer is not resistant to high temperature, and it is difficult to achieve high temperature anti-oxidation effect.

Method used

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  • A kind of copper foil with graphene film on the surface and preparation method thereof
  • A kind of copper foil with graphene film on the surface and preparation method thereof
  • A kind of copper foil with graphene film on the surface and preparation method thereof

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preparation example Construction

[0024] The preparation of copper foil products is mainly divided into three stages: copper dissolution-electrolysis-post-treatment. In this process, graphene covers the surface of copper foil products usually in a surface treatment tank. When dispersing the graphene oxide powder in pure water, the present invention innovatively adds cellulose to the solution, which can not only increase the viscosity of the solution, improve the dispersibility of the graphene oxide particles and reduce the sedimentation rate of the particles, but also During the electrolysis reaction, the cellulose can form an adsorption film on the surface of the copper foil. Through the action of the adsorption film, the graphene particles can be fixed on the cathode surface of the copper foil, so that it can stably participate in the reaction. The invention also adds boric acid to the graphene oxide solution for the first time to adjust the pH value of the solution to around 7.0. Since graphene oxide contai...

Embodiment 1

[0062] Put graphene oxide into deionized water, its content is 0.01mg / L, then add hydroxyethyl cellulose, its content is 1g / L. After that, boric acid was added to adjust the pH value of the solution to around 7.0, and the obtained mixed solution was ultrasonically dispersed for 5 minutes at a frequency of 250 kHz. Pass the fully mixed graphene oxide colloidal solution into the surface treatment tank, the surface treatment tank is a two-electrode reaction mode, in which the counter electrode is a metal titanium plate with an anti-corrosion coating on the surface, and the working electrode is made of dissolved copper-electrolytic The obtained copper foil product enters the surface treatment tank through a transmission device after pickling and water washing. The temperature of the graphene oxide colloidal liquid in the surface treatment tank was 10°C, and the graphene film was electrodeposited on the copper foil surface by cyclic voltammetry. The potential range of cyclic voltam...

Embodiment 2

[0064] Put graphene oxide into deionized water, its content is 50mg / L, then add hydroxyethyl cellulose, its content is 20g / L. Then boric acid was added to adjust the pH value of the solution to around 7.0, and the obtained mixed solution was ultrasonically dispersed for 6 hours at a frequency of 25 kHz. Pass the fully mixed graphene oxide colloidal solution into the surface treatment tank, the surface treatment tank is a two-electrode reaction mode, in which the counter electrode is a metal titanium plate with an anti-corrosion coating on the surface, and the working electrode is made of dissolved copper-electrolytic The obtained copper foil product enters the surface treatment tank through a transmission device after pickling and water washing. The temperature of the graphene oxide colloidal liquid in the surface treatment tank was 80°C, and the graphene film was electrodeposited on the copper foil surface by cyclic voltammetry. The potential range of cyclic voltammetry was -...

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Abstract

The invention discloses a copper foil covered with a graphene film on the surface and a preparation method thereof. The preparation method includes: at least making the copper foil as the working electrode, the counter electrode and the electrolytic solution jointly construct an electrochemical reaction system, and the electrolytic solution includes a graphene oxide colloid solution, which contains at least graphene oxide, cellulose, and boric acid. and a mixed liquid of a dispersing solvent; the electrochemical reaction system is energized by cyclic voltammetry, thereby depositing and forming a graphene film on the surface of the copper foil. The present invention adds cellulose to the electrolyte solution, greatly reduces the sedimentation rate of graphene oxide in the electrolyte solution by changing the viscosity of the solution, improves particle dispersion, and at the same time adds boric acid to the electrolyte solution so that the graphene oxide can be uniformly , and stably react on the surface of copper foil, and the resulting graphene film has good electrical conductivity, which makes the technology of electrolytic graphene oxide to prepare graphene film really possible to be applied in the field of copper foil anti-oxidation surface treatment.

Description

technical field [0001] The present invention relates to a method for on-line surface treatment of copper foil, in particular to a copper foil with on-line surface treatment on an electrolytic copper foil production line, and a copper foil covered with a graphene film on the surface and a preparation method thereof, belonging to copper foil Preparation technology field. Background technique [0002] With the development of new energy economy, the application of lithium-ion batteries has been greatly promoted. Metal copper foil is an important component of lithium-ion battery anode materials, and it plays the role of carrier and conduction in the anode materials. Therefore, the difference in the properties of metal copper foils can have an important impact on the performance of Li-ion anodes and even the entire battery. As a single metal material, metal copper foil is prone to oxidation during storage, transportation and processing. After oxidation, the conductivity and bin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D7/06C25D9/08
CPCC25D7/0614C25D9/08C25D15/00
Inventor 张波冯海涛梁建许志榕王开林李武董亚萍徐慧云荀库李波郑竹林
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI