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Vanadium oxide and carbon composite material with hierarchical pore structure and preparation method thereof

A carbon composite material, vanadium oxide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of high activity, phase transition, guest particle aggregation, etc., to achieve simple preparation process, capacitive performance Improved and good operability

Active Publication Date: 2015-12-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the impregnation method is easy to cause the aggregation of guest particles, resulting in blockage of the pores of the matrix material, and the content of vanadium oxide is low, which cannot effectively exert its pseudocapacitive advantages.
In addition, vanadium oxide has a low melting point and high activity, and high-temperature treatments such as chemical vapor injection can easily cause structural collapse and phase transformation.
[0005] So far, there has been no relevant literature report on the use of volatilization-induced self-assembly method to directly obtain vanadium oxide and carbon composites with hierarchical pore structure as supercapacitor electrode materials

Method used

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  • Vanadium oxide and carbon composite material with hierarchical pore structure and preparation method thereof
  • Vanadium oxide and carbon composite material with hierarchical pore structure and preparation method thereof
  • Vanadium oxide and carbon composite material with hierarchical pore structure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A preferred embodiment in the preparation method of vanadium oxide and carbon composite material, comprises the following steps:

[0025] Mix 1.0g hydrochloric acid solution (0.2mol / L), 1.6g block copolymer F127, 8.0g ethanol, 5.0g ethanol solution with a concentration of 20wt% phenolic resin and 1.5g ammonium metavanadate, and stir at 40°C for 2h. Transfer the mixture to a flat-bottomed evaporating dish, volatilize the ethanol at room temperature at 25°C, and form a dark brown film after about 8 hours. Put the film into a 100°C oven for thermal polymerization and keep it warm for 24 hours, and then heat it under a nitrogen atmosphere at 1°C / The heating rate of min was raised to 700°C for carbonization, and after 3 hours of heat preservation, it was naturally cooled to room temperature to obtain vanadium oxide and carbon composite materials.

[0026] The XRD pattern of the product is shown in figure 1 , it can be seen from the figure that there is V in the composite m...

Embodiment 2

[0029] An embodiment of the preparation method of vanadium oxide and carbon composite material, the steps are the same as in Example 1, the difference is that the mass ratio of the ammonium metavanadate to the amount of hydrochloric acid is 0.5, and the ethanol is volatilized at room temperature at 25 ° C for about 8 hours Finally, a dark blue film is formed, thermally polymerized at 100°C and kept for 24 hours, then heated to 700°C for carbonization at a rate of 2°C / min under a nitrogen atmosphere, and then naturally cooled to room temperature after holding for 3 hours to obtain a vanadium oxide and carbon composite material . SEM, TEM and pore size distribution test show that the product has macropore and mesopore structure, the size of macropore is 0.4~1.5μm, and the size of mesopore is 3.5~5.4nm. XRD analysis test shows that the obtained material has V 2 o 3 and VO 2 Two phases. The specific surface area of ​​the composite material is 413.8m 2 / g, the specific capacit...

Embodiment 3

[0031] An embodiment of the preparation method of vanadium oxide and carbon composite material, the steps are the same as in Example 1, the difference is that the mass ratio of the ammonium metavanadate to the amount of hydrochloric acid is 2.0, and the ethanol is volatilized at room temperature at 25°C for about 8h Finally, a brown-black film is formed, thermally polymerized at 100°C and kept for 24 hours, then heated to 700°C for carbonization at a rate of 1.5°C / min under nitrogen atmosphere, and then naturally cooled to room temperature after holding for 3 hours to obtain vanadium oxide and carbon. composite material. SEM, TEM and pore size distribution tests show that the product has macropore and mesopore structure, the size of macropore is 0.2~0.8μm, and the size of mesopore is 2.8~4.6nm. XRD analysis test shows that the obtained material has V 2 o 3 and VO 2 Two phases. The specific surface area of ​​the composite material is 198.2m 2 / g, the specific capacitance is...

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Abstract

The invention relates to vanadium oxide and carbon composite material with a hierarchical pore structure and a preparation method of the vanadium oxide and carbon composite material with the hierarchical pore structure. The vanadium-carbon ratio of the material is 0.4-1.5, the material is of the hierarchical pore structure and provided with macropores and mesopores, the diameters of the macropores are 0.2-1.5 micrometers, the diameters of the mesoporous are 15-50 nanometers and 2.6-5.4 nanometers, and the specific surface areas of the material are 105.0-413.8 square meter per gram. The preparation method includes the following steps: mixing hydrochloric acid, segmented copolymers, ethanol, phenolic resin and ammonium metavanadate, and obtaining the material through thermal polymerization and carbonization after volatilization induced self-assembly. The composite material can be used as supercapacitor electrode material. Researches in cyclic voltammetry and continuous current charge and discharge of a three-electrode system show that capacitive performance of a vanadium oxide and carbon composite material electrode is improved obviously compared with capacitive performance of an electrode made of mesoporous carbon. The preparation method is simple, low in requirement for devices, good in operability, and low in cost.

Description

technical field [0001] The invention relates to the field of supercapacitor electrode materials, in particular to a vanadium oxide and carbon composite material with a hierarchical pore structure and a preparation method thereof. Background technique [0002] In today's world, the shortage of resources and energy, the shortage of traditional energy and the increasingly serious environmental problems make the large-scale development and utilization of new energy imperative. At present, the most promising new energy sources such as solar energy, wind energy, and tidal energy are in urgent need of storage devices with high energy density, high power density, and large specific energy to store and Stable and continuous release of electric energy. In the field of new environmentally friendly power vehicles, such energy storage devices are also urgently needed to meet the instantaneous high current demand when they start climbing, and can quickly store the high-power energy gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/38H01G11/46H01G11/24H01G11/86
CPCY02E60/13
Inventor 赵春霞曹金巧陈文宋彦宝朱泉峣吴小芳李俊申
Owner WUHAN UNIV OF TECH
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