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Porous carbon electrode material based on chitosan and derivative of chitosan thereof as well as preparation method and application of porous carbon electrode material

A porous carbon electrode and chitosan technology, applied in battery electrodes, hybrid capacitor electrodes, circuits, etc., can solve the problems of restricting the application of porous carbon materials, inability to optimize the combination, and high production costs, and achieve good rate performance. Undemanding, low-cost effects

Active Publication Date: 2014-10-08
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems that one cannot combine nitrogen doping modification with pore structure optimization, and the other is that the carbon precursors used (such as aniline, acetonitrile, quinoline, pyrrole, melamine, etc.) generally have poor safety and high production costs. , environmental pollution and other issues
These issues limit the application of porous carbon materials in the field of electrochemistry

Method used

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  • Porous carbon electrode material based on chitosan and derivative of chitosan thereof as well as preparation method and application of porous carbon electrode material
  • Porous carbon electrode material based on chitosan and derivative of chitosan thereof as well as preparation method and application of porous carbon electrode material
  • Porous carbon electrode material based on chitosan and derivative of chitosan thereof as well as preparation method and application of porous carbon electrode material

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Experimental program
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Effect test

Embodiment 1

[0036] Weigh 0.35g cetyltrimethylammonium bromide (CTAB) and add it to a mixed solution of 110ml deionized water and 60ml ethanol, stir well and then add 2ml tetraethyl orthosilicate (TEOS) and 2ml ammonia water (NH 3 ·H 2 O, NH 3 Content is 25~28%), and continue to stir for 10 hours to obtain hollow silica balls; another 4g viscosity-average molecular weight is 6×10 5 Chitosan was dissolved in 200ml volume ratio of 2% glacial acetic acid solution, and after stirring for 10 hours, chitosan carbon precursor solution was obtained; then hollow silica balls were immersed in the chitosan solution, and stirred for 18 hours Pour it into a petri dish and put it in a drying oven to solidify at 100°C for 18 hours to obtain a solid film; then grind the solid film and place it in an atmosphere tube furnace to calcinate at 800°C for 3 hours under the protection of high-purity nitrogen to obtain a black solid powder; finally, the hollow silica balls were removed by hydrofluoric acid solut...

Embodiment 2

[0040] The method of this embodiment is basically the same as that of Example 1, except that in the preparation process, 4g of viscosity-average molecular weight was weighed to be 5×10 4 Chitosan was dissolved in 200ml volume ratio of 2% benzoic acid aqueous solution to prepare chitosan carbon precursor solution. The testing and characterization means are also the same as in Example 1. looks like image 3 As shown, the porous carbon and nitrogen doping content is 3.2%; the electrochemical test results are as follows Figure 6 Shown, the molecular weight is 5×10 4 When chitosan is used as the carbon precursor to prepare porous carbon, the specific capacity of the material is 582mAh / g, which is also higher than that of commercial graphite, and the Coulombic efficiency is also above 96%, which also shows good rate performance.

Embodiment 3

[0042] The method of the present embodiment is basically the same as that of Example 1, except that in the preparation process, 4 g of water-soluble carboxymethyl chitosan was dissolved in 200 ml of deionized water to prepare the chitosan carbon precursor solution. The testing and characterization means are also the same as in Example 1. looks like Figure 4 As shown, the porous carbon and nitrogen doping content is 5.6%; the electrochemical test results are as follows Figure 7 As shown, when the porous carbon is prepared with water-soluble carboxymethyl chitosan as the carbon precursor, the specific capacity of the material is 635mAh / g, which is also higher than that of commercial graphite, and the Coulombic efficiency is also above 96%. Good rate performance.

[0043] The obtained porous carbon material structure of the present invention is as figure 1 As shown, it is characterized by nitrogen doping and pore classification, and the pore structure is a hierarchical pore ...

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Abstract

The invention discloses a porous carbon electrode material based on chitosan and a derivative of chitosan as well as a preparation method and application of the porous carbon electrode material. According to a hard template carbonization method, by taking a hollow silicon oxide ball as a template and taking chitosan and a derivative of chitosan as carbon source precursors, liquid-phase impregnation, high-temperature carbonization, template removing and the like are carried out so as to obtain the porous carbon electrode material suitable for a lithium ion battery and a supercapacitor. The prepared porous carbon electrode material simultaneously has the characteristics of a nitrogen-doped structure and a macroporous-mesoporous-microporous graded pore structure, wherein the nitrogen-doped content can be controlled by using different types of chitosans; the graded pore structure can be controlled by changing the size of the particle diameter and the wall thickness of each silicon oxide ball and regulating the mass of the chitosan solution. Compared with the commercialized graphite, the porous carbon electrode material prepared according to the method disclosed by the invention has the advantages that the specific capacity is obviously increased and the rate performance of the obtained porous carbon electrode material is maintained well. The porous carbon electrode material is simple in preparation process, has no strict requirement to equipment and is suitable for industrial production.

Description

[0001] technical field [0002] The invention relates to a porous carbon electrode material based on chitosan and its derivatives, a preparation method and application thereof, and belongs to the field of electrochemistry and new energy materials. Background technique [0003] As the global energy crisis and environmental protection issues become increasingly prominent, the development and utilization of new energy sources (such as solar energy, wind energy, etc.) has become the only way to achieve sustainable energy development and solve increasingly serious environmental pollution. However, the large-scale utilization of new energy requires the establishment of a matching high-efficiency energy storage system. As a new generation of green and environmentally friendly batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, and environmental friendliness; as a new generation of energy storage devices, supercapacitors have the advant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02H01M4/583H01G11/32
CPCY02E60/10Y02E60/13
Inventor 郭连贵覃彩芹丁瑜王锋李伟
Owner HUBEI ENG UNIV
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