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A kind of graphene composite metal film and preparation method thereof

A graphene and graphite technology, applied in the field of graphene composite metal film and its preparation, can solve the problems of reduced coating resistance, unsuitable popularization and application, cumbersome process, etc., and achieves low cost, high social and economic benefits, and simple method. easy effect

Active Publication Date: 2019-09-17
北京中科云腾科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the current process of using graphene to coat metal foil is cumbersome and costly, which is not suitable for popularization and application, and the coating resistance of the obtained graphene composite metal film still needs to be further reduced

Method used

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Examples

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Effect test

preparation example Construction

[0020] In a first aspect, the present invention provides a method for preparing a graphene metal composite film, wherein the method comprises the following steps:

[0021] (1) mechanical peeling is carried out after mixing graphite and liquid phase medium to obtain a mixture containing graphite and graphene;

[0022] (2) the described mixture containing graphite and graphene is centrifuged, and the supernatant liquid containing graphene is collected;

[0023] (3) The supernatant liquid containing graphene is optionally dried and mixed with a binder to obtain a mixed liquid containing graphene and a binder, and the mixed liquid is coated on a metal substrate.

[0024] According to the present invention, the term "mechanical exfoliation" has the meaning well known in the art, and refers to the exfoliation of graphene thin layers from graphite by physical methods. In the present invention, any physical method capable of exfoliating the graphene thin layer from graphite under the...

Embodiment 1

[0047] This example is used to illustrate the method for preparing a graphene metal composite film provided by the present invention

[0048] According to the ratio of graphite and organic solvent to 1g: 30ml, graphite was added to N,N-dimethylformamide, and the obtained mixed solution was added to the grinding and dispersing machine, and the peeling was continued for 3h at room temperature and a frequency of 80Hz; A graphite-graphene mixture was obtained; the mixture was then centrifuged multiple times at 9000 rpm at room temperature, and the graphene-containing supernatant was collected.

[0049] Ultrasonic dispersion 30min after mixing the supernatant liquid containing graphene and the binder, preparing a mixed solution with a graphene content of 1.5% by weight and a binder content of 3% by weight, wherein the binder is polyvinyl alcohol .

[0050] The mixed solution was coated on one side of the aluminum foil with a thickness of 0.02 mm, and was placed in an oven for curi...

Embodiment 2

[0053] This example is used to illustrate the method for preparing a graphene metal composite film provided by the present invention

[0054] According to the ratio of graphite and organic solvent to 1g:50ml, graphite was added to N-methylpyrrolidone, and the obtained mixed solution was added to the grinding and dispersing machine, and the exfoliation was continued for 4h at room temperature and 90Hz frequency; graphite-graphite was obtained. The graphene mixture was then centrifuged several times at 12,000 rpm at room temperature, and the graphene-containing supernatant was collected.

[0055] Ultrasonic dispersion 30min after mixing the supernatant liquid containing graphene and the binder, preparing a mixed solution with a graphene content of 3% by weight and a binder content of 5% by weight, wherein the binder is polyvinylidene fluoride vinyl.

[0056] The mixed solution was coated on one side of the aluminum foil with a thickness of 0.02 mm, and was placed in an oven for...

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Abstract

The present invention relates to the field of graphene metal composite materials, and discloses a graphene metal composite film and a preparation method thereof. The method comprises: (1) mixing graphite and a liquid-phase medium, and mechanically stripping to obtain a mixture containing graphite and graphene; (2) carrying out centrifugal separation on the mixture containing graphite and graphene, and collecting the graphene-containing supernatant; and (3) optionally drying the graphene-containing supernatant, mixing with a binder to obtain a mixed solution containing the graphene and the binder, and coating the mixed solution onto a metal substrate. According to the present invention, the graphene metal composite film prepared by using the method has advantages of thin coating thickness and low coating resistance, wherein the thickness of the electric conduction coating can be as thin as 0.2 [mu]m and the coating resistance can be as low as 2.2*10<-6>omega.cm through the following embodiment; and the method is simple and easy to perform, has the low cost, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the field of graphene metal composite materials, in particular to a graphene composite metal film and a preparation method thereof. Background technique [0002] With the application and market expansion of lithium-ion batteries, power lithium-ion batteries with high-power charging and discharging, high safety and long service life gradually occupy a dominant position in the market, and the market share of electric tools, electric bicycles and electric vehicles is increasing every year At the same time, rapid charging and discharging, high safety and long service life have become the focus of attention, and have also become a stumbling block to limit the rapid development of the new energy industry. Therefore, it is particularly important to highlight battery technology. [0003] In the conventional lithium-ion battery pole piece manufacturing process, the positive electrode active material slurry is directly coated on the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66
CPCH01M4/661H01M4/663H01M4/667Y02E60/10
Inventor 李青春
Owner 北京中科云腾科技有限公司
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