Graphene composite metal film and preparation method thereof

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

Active Publication Date: 2017-02-01
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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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 exfoliation is carried out after graphite and liquid phase medium are mixed, obtain the mixture containing graphite and graphene;

[0022] (2) centrifuging the mixture containing graphite and graphene, collecting the supernatant containing graphene;

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

[0024] According to the present invention, the term "mechanical exfoliation" has a well-known meaning in the art, and refers to exfoliating graphene thin layers from graphite by physical methods. Any physical method capable of stripping the graphene thin layer from graphite under the condition of liquid medium can be used in the pres...

Embodiment 1

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

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

[0049] After mixing the supernatant liquid containing graphene and the binder, ultrasonically disperse it for 30 minutes, and prepare 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] Coat the mixed solution on a 0.02mm thick aluminum foil on one side, and put it into an oven to solidify at a tempera...

Embodiment 2

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

[0054] According to the ratio of graphite and organic solvent of 1g: 50ml, graphite is added to N-methylpyrrolidone, and the obtained mixed solution is added to a grinding disperser, and the peeling is continued at room temperature and a frequency of 90Hz for 4h; graphite-graphite Graphene mixture; then the mixture was centrifuged several times at room temperature at 12000 rpm to collect the graphene-containing supernatant.

[0055] After mixing the supernatant liquid containing graphene and the binder, ultrasonically disperse it for 30 minutes, and prepare 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] Coat the mixed solution on one side of the 0.02mm aluminum foil, put it into an oven and solidify at a temperature of 50°C for 2 hour...

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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 increases every year. At the same time, fast charging and discharging, high safety and long service life have become the focus of attention, and have also become stumbling blocks restricting the rapid development of the new energy industry. Therefore, battery technology is particularly important. [0003] In the conventional lithium-ion battery pole piece manufacturing process, the positive electrode active material slurry is directly coated on the surface of the metal f...

Claims

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Application Information

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Patent Type & Authority Applications(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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