Graphene lyogel thin-film preparation method

A technology of graphene gel and graphene hydrogel, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of low energy density of supercapacitors, collapse of three-dimensional pore networks, and no significant improvement, and achieve easy Large-scale production preparation, simple preparation method, and the effect of reducing thickness

Inactive Publication Date: 2014-09-24
李巍
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low energy density of supercapacitors compared with other energy storage devices is not significantly improved because of the large thickness of the graphene liquid gel film.
At the same time, during the preparation process of this gel film, graphene is prone to re-stacking and turns into graphite, and the conductivity is greatly reduced.
At the same time, this also caused the collapse of the three-dimensional pore network inside the gel, reducing the specific surface area.
This is detrimental to the application of graphene gel films on supercapacitors

Method used

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Examples

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Effect test

Embodiment 1

[0026] Add 100 mg of graphene microflakes into a beaker filled with 200 ml of deionized water, then place the ultrasonic breaker inside the beaker, and perform ultrasonic treatment with a power of 200W for 2 hours. After the treatment, the graphene microchips are dispersed in deionized water to become a colloidal dispersion of graphene microchips. A mixed cellulose ester filter membrane with a filter pore size of 0.05 μm was placed on a glass suction filter flask with a 80 mm diameter frit funnel. Take 100ml of the prepared dispersion and carry out suction filtration. During the process of suction filtration, a layer of black film will be formed on the filter membrane, such as figure 1 shown. When the liquid on the membrane has just been pumped out, immediately turn off the vacuum pump of the suction filter. At this time, what is obtained on the filter membrane is a graphene hydrogel film, such as figure 1 , 2 shown. Carefully remove the membrane from the filter. Prepar...

Embodiment 2

[0028] Add 100 mg of graphene microflakes into a beaker filled with 500 ml of N-methylpyrrolidone, then place a sonicator inside the beaker, and perform ultrasonic treatment at a power of 200W for 3 hours. After the treatment, the graphene microplates are dispersed in N-methylpyrrolidone to become a colloidal dispersion of graphene microplatelets. A polypropylene filter membrane with a filter pore size of 0.1 μm was placed on a glass suction filter flask with a 40 mm diameter fritted funnel. Take 200ml of the prepared dispersion and carry out suction filtration. During the suction filtration, a black film will form on the filter membrane. When the liquid on the membrane has just been pumped out, immediately turn off the vacuum pump of the suction filter. At this time, what is obtained on the filter membrane is a graphene gel film. Carefully remove the film from the filter, completely soak it in a beaker filled with 500 ml of deionized water, and continuously stir it mechani...

Embodiment 3

[0030]Add 100 mg of graphene microflakes into a beaker filled with 100 ml of N-methylpyrrolidone, then place the sonicator inside the beaker, and perform ultrasonic treatment at a power of 200W for 3 hours. After the treatment, the graphene microplates are dispersed in N-methylpyrrolidone to become a colloidal dispersion of graphene microplatelets. A polypropylene filter membrane with a filter pore size of 0.1 μm was placed on a glass suction filter flask with a 40 mm diameter fritted funnel. Take 200ml of the prepared dispersion and carry out suction filtration. During the suction filtration, a black film will form on the filter membrane. When the liquid on the membrane has just been pumped out, immediately turn off the vacuum pump of the suction filter. At this time, what is obtained on the filter membrane is a graphene gel film. Carefully remove the film from the filter, completely soak it in a beaker filled with 500 ml of deionized water, and continuously stir it mechan...

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Abstract

The invention discloses a graphene lyogel thin-film preparation method. The method includes the steps that firstly, graphene micro-sheet colloid dispersion liquid is subjected to suction and filtration through a micropore filtering membrane, and then a graphene gel thin-film is obtained; secondly, a mixed solution of volatile liquid and non-volatile liquid is made to enter an internal three-dimensional hole network of the gel thin-film under the capillary action, the volatile liquid in the gel thin-film is removed through a vacuum drying method, and the non-volatile liquid is reserved in the gel thin-film. Since the gel thin-film contains the non-volatile liquid, the problems that graphene becomes graphite again due to lamination and then the conductivity of the graphene and the overall specific surface area of the gel thin-film are reduced due to collapse of internal holes of the gel thin-film in the preparation process of the graphene gel thin-film in the past are effectively solved; the thickness of the graphene lyogel thin-film is greatly reduced, so that the energy density is greatly increased when the graphene lyogel thin-film is used as electrodes of supercapacitors.

Description

technical field [0001] The invention relates to a preparation method of a graphene material, in particular to a preparation method of a graphene liquid-containing gel film. Background technique [0002] Graphene is a unique pure two-dimensional material with excellent electrical conductivity, huge theoretical specific surface area, and stable physical and chemical properties. The huge specific surface area and stable properties can make graphene maintain stable performance under the conditions of large working voltage and current, greatly increasing the number of working cycles. The excellent conductivity makes it possible to reduce the internal resistance of the device when used as an electrode and ensure the stability of the device. These advantages make graphene promising as an electrode material for a new generation of supercapacitors. [0003] A liquid gel is a polymer that swells in a liquid but does not dissolve in it. There are a large number of three-dimensional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
Inventor 李巍史彦涛
Owner 李巍
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