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Preparation method of porous carbon material, supercapacitor electrode and supercapacitor

A technology of porous carbon materials and supercapacitors, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, chemical instruments and methods, etc., can solve the problems of supercapacitors that cannot show performance, small effective specific surface area, poor conductivity, etc. , to achieve good wetting effect, good wetting effect and stable performance

Active Publication Date: 2019-11-15
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the poor conductivity and small effective specific surface area of ​​the existing single carbon material, which prevents it from exhibiting excellent performance in supercapacitors, the present invention provides a method for preparing porous carbon materials and supercapacitor electrodes

Method used

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  • Preparation method of porous carbon material, supercapacitor electrode and supercapacitor
  • Preparation method of porous carbon material, supercapacitor electrode and supercapacitor
  • Preparation method of porous carbon material, supercapacitor electrode and supercapacitor

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preparation example Construction

[0029] see figure 1 , the preparation method of the porous carbon material, comprising the following steps:

[0030] Step S01. Dissolving urea and citric acid in a solvent to obtain a precursor solution:

[0031] Step S02. Drying the precursor solution to obtain a precursor material;

[0032] Step S03. Crushing the precursor material to obtain precursor powder;

[0033] Step S04. heating the precursor powder to (700-1000) °C at a heating rate of (2-10) °C / min, carbonizing the precursor powder, and obtaining a carbon material with regular morphology;

[0034] Step S05. Mix the carbon material with an activator under a protective atmosphere, first raise the temperature to (360-400)°C at a heating rate of (2-10)°C / min, and keep warm for (20-30)min; then continue to (2-10) °C / min heating rate to (600-800) °C, and keep warm for (60-120) min to activate the carbon material to obtain a porous carbon material.

[0035] The above-mentioned preparation method will be explained in mo...

Embodiment 1

[0053] A preparation method of a porous carbon material and a supercapacitor. Wherein the preparation method of the porous carbon material comprises the following steps:

[0054] S11. Dissolve 4.2g of citric acid and 1.2g of urea in 10mL of deionized water and sonicate for 3min to obtain a colorless uniform solution;

[0055] S12. Put the solution prepared in step S11 in an oven, set the temperature of the oven at 120° C., react for 24 hours, and cool it down to room temperature naturally to obtain a precursor material;

[0056] S13. Grinding the precursor material into powder, sealed and stored for later use;

[0057] S14. Place the powder prepared above in a corundum crucible, put the crucible into a tube furnace, and feed argon gas to keep the flow rate of argon gas at 50mL / min; the tube furnace starts heating from room temperature, and the heating rate is 5°C / min, heated to 800°C and kept for 60min, then cooled to room temperature to obtain a carbon material with a regul...

Embodiment 2

[0074] A method for preparing a porous carbon material, comprising the steps of:

[0075] S21. Dissolve 2 g of citric acid and 12 g of urea in 50 mL of deionized water and sonicate for 3 min to obtain a colorless uniform solution;

[0076] S22. Put the solution prepared in step S21 in an oven, set the temperature of the oven to 200° C., and cool it down to room temperature naturally after reacting for 12 hours to obtain a precursor material;

[0077] S23. Grinding the precursor material into powder, sealed and stored for later use;

[0078] S24. Place the powder prepared above in a corundum crucible, put the crucible into a tube furnace, and feed argon gas to keep the flow rate of argon gas at 50mL / min; the tube furnace starts heating from room temperature, and the heating rate is 2°C / min, heating to 900°C for 50min, then cooling to room temperature to obtain carbon materials with regular morphology;

[0079] S25. Mix and grind 300 mg of the carbon material obtained in step ...

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Abstract

The invention relates to the technical field of supercapacitor electrode materials and in particular discloses a preparation method of a porous carbon material, a supercapacitor electrode and a supercapacitor. The preparation method comprises the following steps: dissolving urea and citric acid into a solvent so as to obtain a precursor solution; performing drying treatment on the precursor solution so as to obtain a precursor material; crushing the precursor material into precursor powder; increasing the temperature of the precursor powder to (700-1000) DEG C at a temperature increase velocity of (2-10) DEG C / minute so as to carbonize the precursor powder to obtain a carbon material with a regular morphology; in the presence of a protection atmosphere, mixing the carbon material with an activator, increasing the temperature to (360-400) DEG C, keeping the temperature for (20-30) minutes, further increasing the temperature to (600-800) DEG C, and keeping the temperature for (60-120) minutes, so as to obtain the porous carbon material. The porous carbon material disclosed by the invention is stable in property and large in specific surface area, has nitrogen functional groups on thesurface, and is applicable to use as a supercapacitor electrode material.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrode materials, in particular to a preparation method of a porous carbon material, a supercapacitor electrode and a supercapacitor. Background technique [0002] As an important energy storage device, supercapacitors have attracted extensive attention due to their higher energy density than conventional capacitors and higher power density than batteries. The properties of electrode materials are the key factors determining whether the performance of supercapacitors is excellent. Carbon materials are earlier and more widely used materials than conductive polymers and metal oxides. In recent years, although many researchers have studied the common A lot of research has been done on carbon materials for supercapacitors, but it is still difficult to make breakthroughs. A single carbon material is often difficult to show excellent performance when it is used as a supercapacitor electrode d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/318H01G11/44H01G11/34H01G11/86
CPCC01B32/318C01B32/348H01G11/34H01G11/44H01G11/86Y02E60/13
Inventor 曾燮榕刘莉涂建新邹继兆刘丽佳
Owner SHENZHEN UNIV
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