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Preparation method of mesoporous carbon electrode material for ionic liquid super capacitor

A technology for supercapacitors and electrode materials, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of cumbersome preparation process and high cost, and achieve the effect of simple preparation equipment and process, low cost and large specific capacitance value.

Inactive Publication Date: 2010-07-07
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, people have studied new mesoporous carbon electrode materials such as carbon gel, carbon nanotubes, and ordered mesoporous carbon, but the preparation process of these carbon materials is cumbersome and costly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Cut the dried bagasse into 0.5-1cm pieces. Bagasse chips were soaked in 20 wt% zinc chloride solution for 24 hours. Filter to obtain wet bagasse, and dry at 100°C. Place the dried bagasse in a quartz tube, N 2 Under protection, microwave (2.45GHz, 700W) activation for 15 minutes. After the activated product was cooled, it was washed twice with 10% dilute hydrochloric acid, then twice with deionized water, and then dried to obtain a porous carbon electrode material with a specific surface area of ​​1465m 2 / g, the pore volume is 0.92cm 3 / g, the average pore diameter is 2.5nm. The following can be carried out as usual, using the prepared porous carbon as the electrode material, uniformly mixing the prepared activated carbon and polytetrafluoroethylene (PTFE) emulsion according to the mass ratio of 95:5, mixing the paste, and evenly applying it on the foamed nickel collector. Press it into an electrode sheet, and dry it at 120°C until it reaches a constant weight. A...

Embodiment 2

[0018] Cut the dried bagasse into 0.5-1cm pieces. Bagasse chips were soaked in 20 wt% zinc chloride solution for 48 hours. Filter to obtain wet bagasse, and dry at 100°C. Place the dried bagasse in a quartz tube, N 2 Under protection, microwave (2.45GHz, 700W) activation for 30 minutes. After the activated product was cooled, it was washed twice with 10% dilute hydrochloric acid, then twice with deionized water, and then dried to obtain a porous carbon electrode material with a specific surface area of ​​1483m 2 / g, the pore volume is 0.94cm 3 / g, the average pore diameter is 2.5nm. Prepare and test according to the conventional method described in Example 1 below. When the discharge current is 0.2A / g, the specific capacitance value is 127F / g. When the discharge current is 1A / g, the specific capacitance value is 44F / g.

Embodiment 3

[0020] Cut the dried bagasse into 0.5-1cm pieces. Bagasse chips were soaked in 40 wt% zinc chloride solution for 12 hours. Filter to obtain wet bagasse, and dry at 100°C. Place the dried bagasse in a quartz tube, N 2 Under protection, microwave (2.45GHz, 700W) activated for 10 minutes. After the activated product was cooled, it was washed twice with 10% dilute hydrochloric acid, then twice with deionized water, and then dried to obtain a porous carbon electrode material with a specific surface area of ​​1412m 2 / g, the pore volume is 1.62cm 3 / g, the average pore diameter is 4.6nm. Prepare and test according to the conventional method described in Example 1 below. When the discharge current is 0.2A / g, the specific capacitance value is 136F / g. When the discharge current is 1A / g, the specific capacitance value is 71F / g.

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Abstract

The invention relates to a preparation method of mesoporous carbon electrode material for an ionic liquid super capacitor, comprising the following steps: (1) waste bagasse in the sugar production process is used as raw material, the bagasse is dried in the sun firstly, and then the dried bagasse is cut into fragments with a certain length; (2) the bagasse fragments are soaked in the solution with 10-90wt percent of activating agent for 2-72 hours, and then filtration is carried out to obtain the wet bagasse, the wet bagasse is dried at 100 DEG C, and the activating agent is one of zinc chloride, sodium hydroxide and phosphoric acid; (3) the dried bagasse is arranged in a quartz tube and is activated by microwaves under N2 protection; (4) the activated product is cooled, washed and dried to obtain the mesoporous carbon electrode material. The method has simple process and low cost and is suitable for industrial large-scale production. Microwave heating activation can be quickly started and stopped, and the method has the advantages of internal heating property, selectivity, integrity, uniformity, and energy saving; the biomass waste bagasse is used as the raw material, is easy to obtain and is cheap.

Description

technical field [0001] The invention relates to a preparation method of an ionic liquid supercapacitor electrode material, in particular to a preparation method of a biomass-based mesoporous carbon electrode material. . Background technique [0002] Supercapacitors have the characteristics of large capacitance, low leakage current, simple charging and discharging, high specific power and long cycle life. Its capacitance is 20-200 times larger than that of conventional capacitors, and there is no overcharge and discharge phenomenon, and it can be used in the range of -40-70°C. It can provide higher specific energy than electrolytic capacitors, higher specific power and cycle life than secondary batteries, so it can form a composite power system with secondary batteries to meet the high power of the car when starting, accelerating, and climbing Require. Electrochemical capacitors can also be used in conjunction with secondary batteries for DC starting systems of various int...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01G9/042
CPCY02E60/13
Inventor 禚淑萍邢伟周晋高秀丽司维江吴小中
Owner SHANDONG UNIV OF TECH
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