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Preparation method of ionic-liquid modified active carbon electrode material

An ionic liquid and electrode material technology, applied in chemical instruments and methods, circuits, capacitors, etc., can solve the problems of affecting the electrochemical performance of activated carbon-based electrode materials, high corrosion of equipment, polluting the environment, etc., to achieve good conductivity, improve Specific capacitance and effect of increasing specific surface area

Inactive Publication Date: 2012-07-25
BOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified activated carbon prepared by the chemical activation method has a high specific surface area, but the activator is not cleaned thoroughly, resulting in residue, which affects the electrochemical performance of the activated carbon-based electrode material; the activator used is highly corrosive to the equipment and pollutes the environment

Method used

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  • Preparation method of ionic-liquid modified active carbon electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 8g of 1-methyl-3-butylimidazole glutamic acid ionic liquid with 8g of glucose, stir evenly for 30min, and act under 500W microwave for 40min to obtain 13.6g of brown-black viscous substance, which is carbon dot ionic liquid; Add 77ml of deionized water to the obtained 13.6g carbon dot ionic liquid to form a carbon dot ionic liquid solution with a mass concentration of 15.01%, and add 53g of activated carbon powder to the solution, stir evenly, immerse for 40min, and 800W ultrasonic dispersion for 30min. Microwave was applied for 30 min, suction filtered, and the filtrate was recovered for modified activated carbon, and the solid phase was vacuum-dried at 80°C for 10 h to obtain a black powdery ionic liquid modified activated carbon electrode material.

[0016] The ionic liquid modified activated carbon electrode material with a mass ratio of 39:1:5:1:4, the dispersant quaternary ammonium salt surfactant, the conductive agent Ketjen black, the thickener sodium carboxy...

Embodiment 2

[0020] Mix 9g of 1-methyl-3-butylimidazole glutamic acid ionic liquid with 8g of fructose, stir evenly for 60min, and act under 800W microwave for 50min to obtain 14.4g of brown-black viscous substance, which is carbon dot ionic liquid; The obtained 14.4g carbon dot ionic liquid was added into 58ml deionized water to form a mass concentration of 19.89% carbon dot ionic liquid solution, and 40.1g of activated carbon powder was added to the solution, stirred evenly, soaked for 60min, and dispersed by 900W ultrasonic waves for 40min. Under 800W microwave for 40min, suction filtration, the filtrate was recovered for modified activated carbon, and the solid phase was vacuum-dried at 100°C for 12h to obtain a black powdery ionic liquid modified activated carbon electrode material.

[0021] The prepared ionic liquid modified activated carbon electrode material was assembled into a simulated ionic liquid modified activated carbon supercapacitor according to the same method as in Exampl...

Embodiment 3

[0023] Mix 10g of 1-methyl-3-butylimidazole glutamic acid ionic liquid with 8g of sucrose, stir evenly for 45min, and act under 600W microwave for 45min to obtain 15.2g of brown-black viscous substance, which is carbon dot ionic liquid; The obtained 15.2g carbon dot ionic liquid was added into 65ml deionized water to make a mass concentration of 18.95% carbon dot ionic liquid solution, and 44g of activated carbon powder was added to the solution, stirred evenly, immersed for 50min, and dispersed by 1000W ultrasonic wave for 35min. Microwave was applied for 35 min, suction filtered, and the filtrate was recovered for modified activated carbon, and the solid phase was vacuum-dried at 80°C for 11 h to obtain a black powdery ionic liquid modified activated carbon electrode material.

[0024] The prepared ionic liquid modified activated carbon electrode material was assembled into a simulated ionic liquid modified activated carbon supercapacitor according to the same method as in Ex...

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Abstract

The invention relates to a preparation method of an ionic-liquid modified active carbon electrode material, which comprises the following steps: mixing 1-methyl-3-butylimidazolium glutamic acid ionic liquid with carbohydrate compounds, uniformly stirring under a microwave action to obtain a brownish-black viscous substance, i.e. carbon spot ionic liquid; and then adding de-ionized water into the carbon spot ionic liquid to prepare a carbon spot ionic liquid solution, placing active carbon powder into the solution to be uniformly mixed, soaked, dispersed by ultrasonic waves, induced by microwaves and filtered to obtain a solid phase, and finally vacuum-drying the solid phase to obtain the ionic-liquid modified active carbon electrode material. The method is simple to operate, the adopted carbon spot ionic liquid is friendly to the environment, has no pollutant and can be recycled, and the prepared ionic liquid has excellent electrolyte wettability; and the modified active carbon has large specific surface area, is uniform in aperture distribution, and has multiple conductive active substances and small internal resistance. When the modified active carbon electrode material is used as an electrode material for a super-capacitor, the specific capacity, application efficiency, service life, specific capacitance and constant-current discharging-charging efficiency of the super-capacitor can be improved.

Description

technical field [0001] The invention relates to a preparation method of an ionic liquid modified active carbon electrode material that can be used for a supercapacitor. Background technique [0002] As a new type of energy storage element, supercapacitor has the advantages of super large capacitance, high discharge power, fast charge and discharge speed, and long service life. The electrode material of supercapacitor is one of the main factors affecting its capacitive performance. Activated carbon-based electrode materials have the advantages of relatively large specific surface area, good electrochemical stability, low cost and easy availability, and are currently the preferred materials for commercial production. However, there are more oxygen-containing functional groups on the surface of activated carbon, which will increase the self-discharge and inflation of supercapacitors; the pore structure is very complex, and the pore size ranges from micropores of a few nanometer...

Claims

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Application Information

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IPC IPC(8): C01B31/08H01G9/042C01B32/36
CPCY02E60/13
Inventor 魏颖张庆国金振兴蔡克迪何铁石
Owner BOHAI UNIV
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