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Preparation method of nano vanadium dioxide/natural porous carbon electrode material

A porous carbon electrode, vanadium dioxide technology, applied in the manufacture of hybrid/electric double layer capacitors, nanotechnology, nanotechnology, etc., can solve the problems of high price, and achieve the effect of low cost, good product performance and environmental friendliness

Active Publication Date: 2021-01-15
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that although the existing electrode materials have high performance, they are expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] The preparation method of nano vanadium dioxide / natural porous carbon electrode material, comprises the steps:

[0027] a. Pretreatment of pure cotton felt: Soak pure cotton felt with acetone solution, then wash and dry;

[0028] B, carbonizing the pure cotton felt after step a treatment;

[0029] c. Preparation of ethylene glycol vanadyl solution: mix and stir ammonium metavanadate and ethylene glycol, control the reaction temperature at 50-90° C., cool and filter after the reaction to obtain ethylene glycol vanadyl solution;

[0030] d. Introduce nano-vanadium dioxide: put the pure cotton felt after the carbonization treatment in step b into the vacuum heating equipment, turn on the vacuum and heat, continuously feed nitrogen, and control the temperature at 300-500 ° C; at the same time, put the ethylene glycol vanadyl solution Diluted with ethanol, ultrasonically atomized, sent to vacuum heating equipment to react with pure cotton felt; after the reaction, cooled to...

Embodiment 1

[0039] Put the pure cotton felt after the pretreatment mode (removal of impurities) according to the present invention into a vacuum tube furnace, and feed high-purity N 2 Pre-carbonization was carried out at a temperature of 180°C for 130 minutes, the temperature was raised to 800°C for further carbonization for 4 hours, the temperature of the tube furnace was adjusted to 300°C, and the prepared ethylene glycol vanadyl solution was mixed with ethanol at a volume ratio of 1 : 6 dilution, after the frequency is 3.5MHz ultrasonic atomization, the blast is sent into the tube furnace, and the specific capacitance of the electrode prepared after 3 hours of reaction is 0.198F cm -2 , at a current density of 15mA·cm -2 After 2000 cycles of charging and discharging, the specific capacitance is 89.29% of the initial value.

Embodiment 2

[0041] The pure cotton felt treated by the present invention is put into a vacuum tube furnace, and the high-purity N 2 Pre-carbonization was carried out at a temperature of 200°C for 120 minutes, the temperature was raised to 900°C for further carbonization for 3 hours, the temperature of the tube furnace was adjusted to 350°C, and the ethylene glycol vanadyl solution prepared according to the method of the present invention was prepared with ethanol according to Diluted at a volume ratio of 1:7, after ultrasonic atomization at a frequency of 2.5MHz, blast into a tube furnace, and react for 4 hours to prepare an electrode with a specific capacitance of 0.201F·cm -2 , at a current density of 10mA·cm -2 After 2000 cycles of charging and discharging, the specific capacitance is 90.01% of the initial value.

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Abstract

The invention discloses a preparation method of a nano vanadium dioxide / natural porous carbon electrode material. The method comprises the following steps: a, preprocessing a pure cotton felt; b, carbonizing the pure cotton felt treated in the step a; c, preparing an ethylene glycol vanadyl solution; and d, introducing nano vanadium dioxide: putting the pure cotton felt subjected to carbonizationtreatment into vacuum heating equipment, starting vacuum and heating, continuously introducing nitrogen, and controlling a temperature to be 300-500 DEG C; meanwhile, diluting the ethylene glycol vanadyl solution with ethanol, carrying out ultrasonic atomization, and then feeding into vacuum heating equipment to react with the pure cotton felt; and after the reaction is finished, cooling to obtainthe nano vanadium dioxide / natural porous carbon electrode material. According to the method, the pure cotton felt is used as a raw material, the pure cotton felt is subjected to carbonization treatment, ethylene glycol vanadyl is decomposed into vanadium dioxide to be attached to the carbonized pure cotton felt in an ultrasonic atomization and calcination mode, and the obtained electrode materialis excellent in performance, low in cost and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of electrode material preparation, and in particular relates to a preparation method of nano vanadium dioxide / natural porous carbon electrode material. Background technique [0002] Supercapacitors are composed of electrode materials, electrolytes, diaphragms, and collectors. Each part has a great impact on supercapacitors, and electrode materials play a decisive role in the performance of supercapacitors. Common electrode materials for supercapacitors include carbon materials, metal oxide materials, conductive polymer materials, and composite materials. Carbon materials are widely used as electrode materials for supercapacitors because of their low cost and various forms of existence. However, because they only use the electric double layer to store energy, their performance is limited, so there is a new trend of metal oxide materials. Electrode development and research. Metal oxide materials are different from sto...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/46H01G11/86B82Y30/00
CPCH01G11/32H01G11/46H01G11/86B82Y30/00Y02E60/13
Inventor 李道玉姚洁辛亚男彭穗
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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