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Preparation method for graphene membrane electrode material of supercapacitor

A supercapacitor and graphene film technology, applied in the field of preparation, can solve the problems of increasing the quality and volume of supercapacitors, low bulk density, general performance, etc., and achieve the effects of improving cycle stability, low reaction temperature, and improving capacitance performance

Inactive Publication Date: 2017-11-10
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of graphene hydrogel with three-dimensional porous network structure by hydrothermal method can effectively improve the mass specific capacitance of graphene electrode materials, but due to its ultra-low packing density, only general volume specific capacitance can be obtained.
(3) Solvent reflux method. This method prepares the powdered graphene electrode material and needs to mix the binder with it. After hot pressing, an independent self-supporting electrode or an electrode attached to the current collector can be prepared. According to the amount of the electroactive substance According to calculations, electrode materials can have high volume and high-quality capacitive performance at the same time, but for the entire assembled capacitor, additional binders and current collectors increase the total mass and volume of the supercapacitor, which is limited in practical applications

Method used

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  • Preparation method for graphene membrane electrode material of supercapacitor
  • Preparation method for graphene membrane electrode material of supercapacitor
  • Preparation method for graphene membrane electrode material of supercapacitor

Examples

Experimental program
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Effect test

Embodiment example 1

[0023] The preparation of implementation case 1 graphene film electrode material

[0024] Preparation of graphene oxide film: According to the improved Hummers method, graphite was used as raw material to prepare a graphene oxide aqueous solution with a concentration of 5 mg / mL. Take 2 mL of a 5 mg / mL graphene oxide aqueous solution in a polytetrafluoroethylene cover, put it in a vacuum oven at 30°C, and dry it to obtain a graphene oxide film.

[0025] Preparation of graphene membrane electrode material: fully soak the graphene oxide membrane in a polytetrafluoroethylene reactor filled with concentrated sulfuric acid, and react at 160°C for 12h. Cool at room temperature, wash with distilled water until neutral, and dry at 60°C to prepare a graphene membrane electrode material. Such as figure 1 X-ray diffraction spectrogram for the prepared graphene film electrode material. It can be seen from the figure that the diffraction peak at 10.72° belongs to the C(001) crystal plane...

Embodiment example 2

[0026] Implementation Case 2 Preparation of Graphene Membrane Electrode Material

[0027] Preparation of graphene oxide film: Same as Example 1.

[0028] Preparation of graphene membrane electrode material: fully soak the graphene oxide membrane in a polytetrafluoroethylene reactor filled with concentrated sulfuric acid, and react at 140°C for 12h. Cool at room temperature, wash with distilled water until neutral, and dry at 60°C to prepare a graphene membrane electrode material. It can be seen from the scanning electron microscope that the surface of the prepared graphene membrane electrode material has a large number of wrinkles, such as image 3 shown. A symmetrical supercapacitor was assembled using it as an electrode material, and a two-electrode method was used at 1M H 2 SO 4 In the electrolyte, when the scan speed is 1mV s -1 , the mass specific capacitance reaches 156F g -1 , the volume specific capacitance reaches 309F cm -3 .

Embodiment example 3

[0029] Implementation Case 3 Preparation of Graphene Membrane Electrode Material

[0030] Preparation of graphene oxide film: Same as Example 1.

[0031] Preparation of graphene membrane electrode material: fully soak the graphene oxide membrane in a polytetrafluoroethylene reactor filled with concentrated sulfuric acid, and react at 180°C for 12h. Cool at room temperature, wash with distilled water until neutral, and dry at 60°C to prepare a graphene membrane electrode material. From the scanning electron microscope images, it can be seen that the surface of the prepared graphene membrane electrode has a large number of wrinkles, such as Figure 4 shown. A symmetrical supercapacitor was assembled using it as an electrode material, and a two-electrode method was used at 1M H 2 SO 4 In the electrolyte, when the scan speed is 1mV s -1 When the mass specific capacitance reaches 200F g -1 , the volume specific capacitance reaches 396F cm -3 .

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Abstract

The invention provides a preparation method for a graphene membrane electrode material of a supercapacitor. The preparation method comprises the following steps: thoroughly soaking a graphene oxide membrane or reduced graphene oxide membrane in a polytetrafluoroethylene reaction vessel filled with concentrated sulfuric acid; carrying out a reaction at 120 to 180 DEG C for 3 to 24 h; and then carrying out cooling at room temperature, washing with distilled water and drying so as to prepare the graphene membrane electrode material. A supercapacitor assembled from the graphene membrane electrode material has good capacitive performance, especially superior cycle stability. The preparation method provided by the invention is convenient to operate. The prepared graphene membrane electrode material is applicable as an electrode material to symmetric or asymmetric supercapacitors.

Description

technical field [0001] The invention relates to the preparation of a membrane electrode material, in particular to a preparation method of a graphene membrane electrode material that can be used for a supercapacitor. Background technique [0002] As a new energy storage device between batteries and traditional capacitors, supercapacitors have the characteristics of high energy density of batteries, high power density of traditional capacitors, and simple structure. They have potential application value in new clean energy and other fields. In recent years, consumer electronics products are developing in the direction of miniaturization, flexibility and foldability, which has stimulated people's research interest in high-volume performance supercapacitors that can be used in miniaturized electronic devices. The development of supercapacitors with high power density and high energy density meets the Maximizing the use of electronic devices with limited volume and mass has beco...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/194H01G11/86H01G11/36
CPCY02E60/13H01G11/86H01G11/36
Inventor 韩高义马文辉常云珍
Owner SHANXI UNIV
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