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Preparation method for three-dimensional porous graphene for supercapacitor

A supercapacitor, three-dimensional porous technology, applied in the field of energy material graphene preparation, can solve the problems of restricting development, graphene specific surface size and surface structure, etc., to improve specific capacity and conductivity, reduce agglomeration degree, improve The effect of surface structure

Inactive Publication Date: 2013-02-13
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the specific surface size and surface structure of graphene obtained by the above-mentioned various methods are not ideal, which restricts its further development.

Method used

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  • Preparation method for three-dimensional porous graphene for supercapacitor
  • Preparation method for three-dimensional porous graphene for supercapacitor
  • Preparation method for three-dimensional porous graphene for supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 50 mg of graphene oxide (GO) was weighed and ultrasonically dispersed in 2 mL of deionized water, and ultrasonically treated for 2 h. At the same time, a 7M KOH solution was prepared, and 5 mL of a strong alkali solution was added to the dispersed graphene oxide slurry, and ultrasonic treatment was continued for 2 h. The mixed solution was transferred to a high-temperature ceramic container, and air-dried at 50°C until the surface of the slurry was wet. Transfer the wet slurry to a vacuum drying oven at 180°C for 1 hour, then fully dissolve the obtained solid product in deionized water, and use the prepared 1M dilute hydrochloric acid solution to neutralize to a pH of about 7. The slurry obtained after neutralization was suction filtered and washed three times, and the obtained solid product was dried under vacuum at 50°C to obtain activated graphene oxide (AGO). SEM image of activated graphene oxide figure 1 As shown, the transmission electron microscope image is sho...

Embodiment 2

[0030] 50 mg of graphene oxide (GO) was weighed and ultrasonically dispersed in 2 mL of deionized water, and ultrasonically treated for 2 h. At the same time, a 7M KOH solution was prepared, and 5 mL of a strong alkali solution was added to the dispersed graphene oxide slurry, and ultrasonic treatment was continued for 2 h. Transfer the mixed solution to a high-temperature ceramic container, and directly transfer it to a vacuum drying oven at 180°C for 1 h, then fully dissolve the obtained solid product in deionized water, and use a prepared 1M dilute hydrochloric acid solution for Neutralize until pH is around 7. The slurry obtained after neutralization was suction filtered and washed three times, and the obtained solid product was dried under vacuum at 50°C to obtain activated graphene oxide (AGO). 50 mg of activated graphene oxide was redispersed in 100 mL of deionized water, 2 mL of 80% hydrazine hydrate was added and refluxed for 20 h under the condition of 100 ° C oil b...

Embodiment 3

[0033] A 7M KOH solution was prepared and 50mg of graphene oxide (GO) was ultrasonically dispersed in 5mL of strong alkali solution, and ultrasonically treated for 2h. The mixed solution was transferred to a high-temperature ceramic container, and air-dried at 50°C until the surface of the slurry was wet. Transfer the wet slurry to a vacuum drying oven at 180°C for 1 hour, then fully dissolve the obtained solid product in deionized water, and use a prepared 1M dilute hydrochloric acid solution to neutralize to a pH of about 7. The slurry obtained after neutralization was suction filtered and washed three times, and the obtained solid product was dried under vacuum at 50°C to obtain activated graphene oxide (AGO). 50 mg of activated graphene oxide was redispersed in 100 mL of deionized water, 2 mL of 80% hydrazine hydrate was added and refluxed for 20 h under the condition of 100 ° C oil bath, the obtained product was subjected to suction filtration and washing, and dried under...

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Abstract

The invention provides a preparation method for three-dimensional porous graphene for a supercapacitor. The preparation method comprises steps as follows: ultrasonically dispersing graphene oxide; fully mixing with a strong alkali solution; pre-drying until a surface is humidified; then activating at a vacuum environment at 120 to 180 DEG C or in protective gas atmosphere at 180 to 1200 DEG C under a high temperature; and etching the surface of the graphene to obtain a three-dimensional porous structure through high-temperature strong alkali and stream, so as to improve a specific surface area of a graphene material. According to the preparation method, activated graphene oxide is reduced through chemical reduction and high-temperature reduction methods, so as to improve a performance of activated graphene. The activated graphene and an adhesive are mixed to prepare into electrode paste based on a certain mass ratio, and the electrode paste is loaded on a conductive current collector to prepare into a supercapacitor electrode, so that a degree of agglomeration of the graphene on a pole piece can be further reduced, and a high electrochemical performance can be obtained.

Description

technical field [0001] The invention relates to a method for preparing graphene materials by chemical treatment, and belongs to the technical field of energy material graphene preparation. Background technique [0002] A supercapacitor, also known as an electric double layer capacitor or an electrochemical capacitor, is composed of an electrode (Electrode), an electrolyte (Electrolyte), and a separator (Separator) composed of a current collector loaded with electrode active materials. Supercapacitors mainly form an electric double layer with opposite charges at the interface between the electrode and the electrolyte for energy storage, and its power density and energy density are between secondary batteries and traditional physical capacitors. Since the supercapacitor does not undergo electrochemical reactions during charging and discharging, the cycle life can reach 100,000 times, and it has excellent performance under high current charging and discharging. Supercapacitors...

Claims

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Application Information

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IPC IPC(8): C01B31/04H01G11/86C01B32/184
CPCY02E60/13
Inventor 纪效波宋维鑫杨应昌潘成迟陈启元李叙
Owner CENT SOUTH UNIV
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