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Flexible graphene film capable of being repeatedly folded, preparation method of flexible graphene film and flexible device comprising flexible graphene film

A technology of flexible graphite and graphene film, applied in the direction of graphene, chemical instruments and methods, hybrid capacitor electrodes, etc., can solve the problem that the realization or improvement of the flexible graphene film’s repeatable foldability cannot be said to be sufficient, and achieve expansion The effect of using conditions and methods, small amount of reducing agent, and convenient operation

Active Publication Date: 2017-05-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, as far as the existing research on graphene membranes is concerned, further research is needed on the flexibility of the membrane, especially the realization or improvement of the refoldability of flexible graphene membranes cannot be said to be sufficient.

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  • Flexible graphene film capable of being repeatedly folded, preparation method of flexible graphene film and flexible device comprising flexible graphene film
  • Flexible graphene film capable of being repeatedly folded, preparation method of flexible graphene film and flexible device comprising flexible graphene film
  • Flexible graphene film capable of being repeatedly folded, preparation method of flexible graphene film and flexible device comprising flexible graphene film

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no. 1 approach

[0050] In the first embodiment of the present invention, a repeatedly foldable flexible graphene film is provided.

[0051] The flexible graphene film is obtained by reducing the graphene oxide film, the flexible graphene film has a porous structure in the thickness direction, and the flexible graphene film can recover quickly after being folded without leaving creases. in particular:

[0052]

[0053] The graphene oxide film in the present invention means that the dispersion liquid of graphene oxide powder or graphite oxide powder is subjected to film-forming treatment or the powder is subjected to film-pressing treatment.

[0054] At present, the preparation methods of graphite oxide mainly include physical methods and chemical methods. Physical methods usually use cheap flake graphite or expanded graphite as raw materials, and directly prepare single-layer or multi-layer graphite through substrate-free gas phase synthesis, thermal expansion exfoliation, mechanical exfoli...

no. 2 approach

[0079] The second embodiment of the present invention provides a method for preparing a repeatedly foldable flexible graphene film. The method comprises the steps of:

[0080] Step 1: performing a film-forming treatment on the dispersion of graphene oxide powder or graphite oxide powder or performing a film-pressing treatment on the powder to obtain a graphene oxide film;

[0081] Step 2: reducing the graphene oxide film to obtain a graphene film step,

[0082] Classically, the preparation method of the present invention can be carried out according to the following steps:

[0083] Pre-preparation of raw materials for the formation of graphite oxide, such as dissolving natural flake graphite into a strong protic acid, the dissolution process is preferably formed under the action of shear force, such as can use conventional stirring equipment, more typically such as using magnetic force Stirring equipment. The temperature for forming the above solution is preferably 0-4°C. ...

no. 3 approach

[0094] In the third embodiment of the present invention, a flexible device is provided, such as a flexible energy storage and conversion electrode, a flexible sensor, a flexible supercapacitor, a flexible electromagnetic shielding film, a flexible conductive material or a flexible thermal conductive material, etc. The flexible device includes or uses the flexible graphene film according to the first embodiment or the refoldable flexible graphene film obtained by the method for preparing the flexible graphene film according to the second embodiment, and obtained by device assembly.

[0095] The flexible device of the present invention can typically be a flexible supercapacitor.

[0096] In such a molded product, the existence of the flexible graphene film makes the supercapacitor also have the property of being flexible and foldable. After multiple single folds or multiple folds, it can still quickly return to its original shape without leaving creases. equipment offers the po...

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Abstract

The invention provides a flexible graphene film capable of being repeatedly folded, a preparation method of the flexible graphene film and a flexible device comprising the flexible graphene film. The graphene film is obtained by carrying out reduction treatment on a graphene oxide film; a porous structure is formed in the thickness direction of the graphene film; after the graphene film is folded, the graphene film can be recovered and folds are not formed; the thickness of the graphene oxide film is 0.01mu m to 500mu m; compared with the thickness of the graphene oxide film, the expanding multiple of the thickness of the graphene film is 2 to 30 times. The flexible graphene film provided by the invention has the advantages that the porous structure is formed in the thickness direction of the graphene film and the surface of the thin film is smooth and flat; the film has excellent flexible and foldable performance and can be rapidly recovered and has no folds after being folded singly or doubly for a plurality of times; after the film is treated at high temperature, the flexibility can still be kept. The preparation method provided by the invention is simple and convenient to operate and has the advantages of relatively low reduction temperature, small dosage of a reducing agent and small pollution to environment.

Description

technical field [0001] The invention relates to a flexible graphene film, a preparation method thereof and a flexible device assembled using the flexible graphene film, belonging to the technical field of graphene films. Background technique [0002] Graphene is made of carbon atoms through sp 2 The single-layer honeycomb lattice two-dimensional crystal formed by hybridization and close arrangement has a large specific surface area, excellent mechanical properties, electrical conductivity, and thermal conductivity, and is a very attractive material. As an important form of graphene, graphene film has strong electrical conductivity, thermal conductivity, flexibility and other properties, making it widely used in energy storage and conversion materials, electromagnetic shielding materials, thermal conductivity materials, sensor materials and other fields prospect. In order to meet the needs of modern life for flexible and wearable electronic devices, it is of great significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/184H01G11/32H01G11/86
CPCC01B2204/04C01B2204/22C01B2204/24C01B2204/26C01P2004/03C01P2006/90H01G11/32H01G11/86Y02E60/13
Inventor 于中振黄茹玲李晓锋
Owner BEIJING UNIV OF CHEM TECH
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