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Method for preparing coal tar-based porous carbon sheet for supercapacitor by adding ionic liquid

A supercapacitor, ionic liquid technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, carbon preparation/purification, etc., can solve the problems of complex technology and high cost of raw materials, and achieve simple process, high capacity, excellent The effect of rate performance

Active Publication Date: 2017-05-10
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of high cost of raw materials and complex technology for the existing preparation of porous carbon sheets, and proposes a preparation method with low cost, simple process and green environmental protection

Method used

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  • Method for preparing coal tar-based porous carbon sheet for supercapacitor by adding ionic liquid
  • Method for preparing coal tar-based porous carbon sheet for supercapacitor by adding ionic liquid
  • Method for preparing coal tar-based porous carbon sheet for supercapacitor by adding ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Porous carbon sheet PC 9-800 The specific preparation process is as follows:

[0023] (1) Pretreatment of reactants: Weigh 3g of 1-butyl-3-methylimidazolium tetrafluoroborate (BmimBF 4 ) ionic liquid and 3g coal tar; the ionic liquid was added dropwise into the coal tar, and stirred to completely dissolve the coal tar in the ionic liquid; then weighed 9g flake potassium hydroxide and put it into a mortar to grind to powder, and the powder Potassium hydroxide is added to the mixture of coal tar and ionic liquid several times to obtain the pretreated reactant.

[0024] (2) Preparation of coal tar-based porous carbon sheets: the pretreated reactant obtained in step (1) is put into a corundum porcelain boat, and the corundum porcelain boat is placed in a tube furnace, and the airflow of 120mL / min Inject high-purity argon at a high speed for 10 minutes to exhaust the air in the tube-type furnace, then raise the temperature of the tube furnace to 300°C at a rate of 5°C / min ...

Embodiment 2

[0027] Porous carbon sheet PC 12-800 The specific preparation process is as follows:

[0028] (1) The pretreatment of reactant: implement according to the same method as step (1) among the embodiment 1, difference is that the quality of flake potassium hydroxide is 12g.

[0029] (2) Preparation of porous carbon sheet: implement according to the same method as step (2) in Example 1, and the gained porous carbon sheet is marked as PC 12-800 .

[0030] (3) Porous carbon sheet electrochemical performance test: implement according to the same method as step (3) in Example 1, the obtained PC 12-800 The specific volume of the electrode material is 314F / g at a current density of 0.05A / g in 6M KOH electrolyte, and 218F / g at a current density of 20A / g.

Embodiment 3

[0032] Porous carbon sheet PC 15-800 The specific preparation process is as follows:

[0033] (1) Pretreatment of reactant: implement according to the same method as step (1) in Example 1, the difference is that the quality of flake potassium hydroxide is 15g.

[0034] (2) Preparation of porous carbon sheet: implement according to the same method as step (2) in Example 1, and the gained porous carbon sheet is marked as PC 15-800 .

[0035] (3) Porous carbon sheet electrochemical performance test: implement according to the same method as step (3) in Example 1, the obtained PC 15-800 The specific volume of the electrode material is 285F / g at a current density of 0.05A / g in 6M KOH electrolyte, and 181F / g at a current density of 20A / g.

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Abstract

The invention discloses a method for preparing a coal tar-based porous carbon sheet for a supercapacitor by adding ionic liquid, and belongs to the technical field of preparation of carbon materials. The method comprises the following steps of using coal tar as a carbon source, using the ionic liquid as a solvent, using potassium hydroxide as an activating agent, dissolving the coal tar into 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid, uniformly mixing with flaky potassium hydroxide powder, transferring into a corundum boat, putting into a tubular furnace, heating, and naturally cooling to room temperature; fetching out an obtained product, washing by distilled water, and drying, so as to obtain the coal tar-based porous carbon sheet for the supercapacitor. The coal tar-based porous carbon sheet is used as an electrode material of the supercapacitor; at the current density of 0.05A / g, the specific volume is 314F / g in 6M KOH (potassium hydroxide) electrolyte; at the current density of 20A / g, the specific volume is 218F / g. The method has the advantages that a template agent is not used, and the coal tar is directly used as the carbon source to synthesize the porous carbon sheet; the technology is simple, the green and environment-friendly effects are realized, and the like.

Description

technical field [0001] The invention belongs to the technical field of carbon material preparation, and in particular relates to a method for preparing porous carbon sheets for supercapacitors by adding ionic liquids. Background technique [0002] The excessive consumption of fossil fuels in today's society and the aggravation of environmental pollution require the development of environmentally friendly, sustainable new energy sources and new technologies for energy storage. Supercapacitors have the advantages of good cycle stability and high power density, and rely on the adsorption and desorption of charged particles on the surface of electrode materials to store and output energy. The performance of electrode materials for supercapacitors is one of the main factors affecting their performance. [0003] Ionic liquids are composed of organic cations, inorganic or organic anions, and are liquid salts at room temperature or near room temperature, also called room temperatur...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01G11/86H01G11/24H01G11/44
CPCY02E60/13H01G11/86C01P2002/01C01P2002/80C01P2006/12C01P2006/14C01P2006/17C01P2006/40H01G11/24H01G11/44
Inventor 何孝军谢小雨喻能王晓婷余谟鑫
Owner ANHUI UNIVERSITY OF TECHNOLOGY