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Preparation method of mesoporous carbon electrode material for supercapacitor

A technology for supercapacitors and electrode materials, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of no advantage and small specific surface area of ​​mesoporous carbon, and achieve the effects of low cost, short production cycle and simple production process

Inactive Publication Date: 2012-01-11
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it should be pointed out that the mesoporous carbon prepared by the self-assembly method has a small specific surface area, and it is obviously not advantageous to directly use it as an electrode material for a supercapacitor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The barium citrate was placed in a tube furnace, protected by nitrogen (flow rate: 80mL / min), heated to 800°C at a rate of 5°C / min, and stayed at 800°C for 60min. After washing with 0.5mol / L dilute hydrochloric acid and deionized water, mesoporous carbon is obtained after drying, with a specific surface area of ​​1346m 2 / g, mesopore volume up to 4.2cm 3 / g, the average pore diameter is 12.2nm. Using polytetrafluoroethylene emulsion (5%wt) as the binder, the ratio (weight ratio) of the electrode material is: mesoporous carbon: binder = 95:5. Spread the electrode material evenly on the nickel foam at 300kg / cm 2 The working electrode was pressed under a certain pressure, and then dried in a vacuum oven at 100°C for 12 hours. The electrochemical test adopts a double-electrode test system, and the electrolyte solution is 30wt% KOH aqueous solution. In the voltage range of 0V to -0.9V, the specific capacitance is 180F / g when the constant current is 5mA.

Embodiment 2

[0016] Magnesium citrate was placed in a tube furnace, protected by nitrogen (flow rate: 70mL / min), heated to 700°C at a rate of 5°C / min, and stayed at 700°C for 120min. After washing with 0.5mol / L dilute hydrochloric acid and deionized water, mesoporous carbon is obtained after drying, with a specific surface area of ​​up to 2322m 2 / g, mesopore volume up to 1.4cm 3 / g, the average pore diameter is 2.4nm. Teflon emulsion (5%wt) was used as binder. The ratio (weight ratio) of the electrode material is: mesoporous carbon: binder = 95:5. Spread the electrode material evenly on the nickel foam at 300kg / cm 2 The working electrode was pressed under a certain pressure, and then dried in a vacuum oven at 100°C for 12 hours. The electrochemical test adopts a double-electrode test system, and the electrolyte solution is 30wt% KOH aqueous solution. In the voltage range of 0V to -0.9V, the specific capacitance is 183F / g when the constant current is 5mA.

Embodiment 3

[0018] Calcium ethylenediaminetetraacetate was placed in a tube furnace, protected by argon (flow rate: 90mL / min), heated to 900°C at a rate of 3°C / min, and stayed at 900°C for 90min. After washing with 0.5mol / L dilute nitric acid and deionized water, mesoporous carbon is obtained after drying, with a specific surface area of ​​979m 2 / g, mesopore volume up to 2.3cm 3 / g, the average pore diameter is 8.3nm. Teflon emulsion (5%wt) was used as binder. The ratio (weight ratio) of the electrode material is: mesoporous carbon: binder = 95:5. Spread the electrode material evenly on the nickel foam at 300kg / cm 2 The working electrode was pressed under a certain pressure, and then dried in a vacuum oven at 100°C for 12 hours. The electrochemical test adopts a double-electrode test system, and the electrolyte solution is 30wt% KOH aqueous solution. In the voltage range of 0V to -0.9V, the specific capacitance is 175F / g when the constant current is 5mA.

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PUM

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Abstract

The invention relates to a preparation method of a mesoporous carbon electrode material for a supercapacitor. The preparation method is characterized in that metal organic salt is directly carbonized at high temperature under the protection of an inert atmosphere, is treated by using dilute acid and washed by using deionized water to obtain the mesoporous carbon electrode material. The invention can be used for preparing a carbon material with high specific area and mesoporous volume, and has broad application prospect in the field of supercapacitors, adsorption, catalysis and the like. The preparation method of the mesoporous carbon electrode material is different from a hard template method, a chemical or physical activated method and a self-assembling method, and has the characteristicof simple preparation process.

Description

technical field [0001] The invention relates to a preparation method of an electrode material for a supercapacitor, in particular to a method for directly preparing a mesoporous carbon electrode material from a metal organic salt as a raw material. Background technique [0002] Supercapacitors have high power density and energy density and have received extensive attention in recent years. Although its energy density is lower than that of secondary batteries, supercapacitors have many advantages, such as high charge-discharge efficiency, long cycle life, and fast charge-discharge capability. Currently, various porous carbon materials are widely prepared and used as electrode materials for supercapacitors. Studies have shown that mesoporous carbons with high specific surface area are more advantageous than microporous carbons as electrode materials in providing higher power densities. [0003] The exploration of preparation methods of mesoporous carbons with good structural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 禚淑萍邢伟周晋司维江高秀丽袁勋
Owner SHANDONG UNIV OF TECH
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