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Preparation method with polysaccharide modified activated carbon as supercapacitor electrode material

A technology of supercapacitors and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of low capacity of manganese oxide, and achieve large specific surface area, easy operation and rich grade pore structure. Effect

Inactive Publication Date: 2015-12-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, so far, the capacitance of traditional activated carbon materials is basically 100-200F / g, which is lower than that of manganese oxide (~300F / g).

Method used

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  • Preparation method with polysaccharide modified activated carbon as supercapacitor electrode material
  • Preparation method with polysaccharide modified activated carbon as supercapacitor electrode material
  • Preparation method with polysaccharide modified activated carbon as supercapacitor electrode material

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preparation example Construction

[0028] Referring to accompanying drawing, the present invention is the preparation method of polysaccharide modified activated carbon as supercapacitor electrode material, and its steps are:

[0029] Step 1: Weigh 0.1-10.0g of polysaccharide into a 15-500ml hydrothermal reaction kettle, add water to 1 / 2-5 / 6 of the inner volume of the reaction kettle, and stir to form a clear transparent liquid;

[0030] Step 2: The above-mentioned clear and transparent liquid is subjected to a hydrothermal reaction at a temperature of 160-200°C for 2-24 hours, and then the reaction product is obtained by filtration, and the reaction product is washed with water and ethanol three times respectively, and then the reaction product is put into Drying in an oven at low temperature to obtain carbon spheres;

[0031] Step 3: Weigh 0.1-20.0g of the above-mentioned carbon spheres, add them to 20-500ml of water, then add potassium hydroxide, stir evenly to form a mixed solution, and then let it stand fo...

Embodiment 1

[0045] (1) Preparation of carbon sphere precursor by hydrothermal reaction.

[0046] Weigh 4.0 g of glucose and add it to a 25 ml hydrothermal reaction kettle, add water to 3 / 4 of the inner volume of the reaction kettle, stir for 1 hour, and form a clear transparent liquid.

[0047] The above clear and transparent liquid was subjected to a hydrothermal reaction at 200°C for 2 hours, then filtered to obtain the reaction product, washed with water and ethanol three times respectively, and then put the reaction product into an oven and heated at 80°C Dry under ambient conditions for 3 hours to obtain carbon spheres.

[0048] (2) Potassium hydroxide activated carbon spheres to prepare activated carbon materials

[0049] Weigh 2.0g of carbon spheres and 20g of potassium hydroxide, add them into 150ml of water, stir for 2 hours to form a mixed solution, and then let it stand for 24h.

[0050] The above mixed solution was filtered, and the obtained solid product was put into an oven,...

Embodiment 2

[0054] (1) Preparation of carbon sphere precursor by hydrothermal reaction.

[0055] Weigh 8.0 g of sucrose and add it to a 200 ml hydrothermal reaction kettle, add water to 3 / 4 of the inner volume of the reaction kettle, stir for 1 hour, and form a clear transparent liquid.

[0056] The above clear and transparent liquid was subjected to a hydrothermal reaction for 6 hours at a temperature of 180°C, then filtered to obtain the reaction product, washed with water and ethanol three times respectively, and then put the reaction product into an oven and heated at 80°C Dry under ambient conditions for 48 hours to obtain carbon spheres.

[0057] (2) Potassium hydroxide activated carbon spheres to prepare activated carbon materials

[0058] Weigh 3.0g of carbon spheres and 45.0g of potassium hydroxide, add them into 250ml of water, stir for 3 hours to form a mixed solution, and then let it stand for 12h.

[0059] The above mixed solution was filtered, and the obtained solid produc...

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Abstract

The invention provides a preparation method with polysaccharide modified activated carbon as a supercapacitor electrode material. Firstly, a polysaccharide thermal reaction is carried out to obtain a carbon ball, then the carbon ball and potassium hydroxide are mixed and soaked such that the potassium hydroxide is fully diffused into a carbon material, and finally the mixture is subjected to high-temperature calcinations such that the carbon ball is activated by the potassium hydroxide to obtain an activated carbon material. The polysaccharide modified activated carbon material prepared by using the method has the advantages of rich level pore structures and a large specific surface area, as a supercapacitor electrode material, the electrode capacity is high to 510F / g, and the method has the advantages of simple process operation, high reproducibility and low cost.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrode materials, in particular to a method for preparing polysaccharide-modified activated carbon as a supercapacitor electrode material. Background technique [0002] Supercapacitors have high power density (>10kWkg -1 ), long service life (>10 5 Times) and short charge and discharge time (tens of seconds), has been widely used in electronic equipment and hybrid vehicles and other fields. With the rapid development of clean energy and the continuous improvement of automobile performance, the performance and cost requirements for supercapacitor electrode materials are getting higher and higher. Most of the current commercial supercapacitor electrode materials are manganese oxide systems. Although the theoretical capacity of the manganese oxide electrode is high, its cycle stability is poor. After thousands of charges and discharges, its capacity decays seriously and its service ...

Claims

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Application Information

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IPC IPC(8): H01G11/24H01G11/44H01G11/86
CPCY02E60/13
Inventor 郑鹏郭守武刘婷
Owner SHAANXI UNIV OF SCI & TECH
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