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A kind of preparation method of supercapacitor electrode material vanadium sulfide nanoflower

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low specific capacity and poor cycle life of vanadium sulfide, achieve high specific capacity, long cycle life, avoid stacked effect

Active Publication Date: 2020-04-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for preparing vanadium sulfide nanoflowers as an electrode material for supercapacitors, so as to solve the problems of low specific capacity and poor cycle life of vanadium sulfide as a capacitor material

Method used

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  • A kind of preparation method of supercapacitor electrode material vanadium sulfide nanoflower
  • A kind of preparation method of supercapacitor electrode material vanadium sulfide nanoflower
  • A kind of preparation method of supercapacitor electrode material vanadium sulfide nanoflower

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Embodiment 1

[0037] The preparation method of the present embodiment vanadium sulfide nanoflowers comprises the following steps:

[0038] (1) Sodium orthovanadate dodecahydrate (Na 3 VO 4 12H 2 O, 0.9g) and thioacetamide (C 2 h 5 NS, 2.7g) was dissolved in 30mL of water (the concentration of sodium orthovanadate dodecahydrate was 0.03g / mL), and the resulting mixture was placed in a constant temperature water bath at 25°C and stirred for 60min to obtain a light yellow precursor solution;

[0039] (2) Transfer the obtained precursor solution into a 50mL reaction kettle lined with polytetrafluoroethylene, and place the reaction kettle in a blast drying oven at 140°C for hydrothermal reaction for 24 hours. After the reaction is completed, the reaction kettle is naturally After cooling, the obtained product was washed successively with deionized water and ethanol three times respectively, and then dried in a vacuum oven (-0.09MPa) at 80°C for 12 hours to obtain the nano-sized vanadium sulfi...

Embodiment 2

[0041] The preparation method of the present embodiment vanadium sulfide nanoflowers comprises the following steps:

[0042] (1) Sodium orthovanadate dodecahydrate (Na 3 VO 4 12H 2 O, 0.9g) and thioacetamide (C 2 h 5 NS, 1.8g) was dissolved in 30mL of water (the concentration of sodium orthovanadate dodecahydrate was 0.03g / mL), and the resulting mixture was placed in a constant temperature water bath at 25°C and stirred for 50min to obtain a light yellow precursor solution;

[0043] (2) Transfer the obtained precursor solution into a 50mL reaction kettle lined with polytetrafluoroethylene, and place the reaction kettle in a blast drying oven at 160°C for hydrothermal reaction for 22 hours. After the reaction is completed, put the reaction kettle naturally After cooling, the obtained product was washed successively with deionized water and ethanol three times respectively, and then dried in a vacuum oven (-0.09MPa) at 80°C for 12 hours to obtain the nano-sized vanadium sulfid...

Embodiment 3

[0045] The preparation method of vanadium sulfide nanoflowers in this example is the same as in Example 1, except that the mass ratio of sodium orthovanadate dodecahydrate and thioacetamide in this example is 1:1.5.

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Abstract

The invention discloses a preparation method of supercapacitor electrode material vanadium sulfide nanoflower. The method comprises the following steps that 1, sodium orthovanadate dodecahydrate and thioacetamide are prepared into a precursor solution, wherein the mass ratio of sodium orthovanadate dodecahydrate to thioacetamide is 1: (1.2-3.5), and the mass concentration of sodium orthovanadate dodecahydrate is 0.02-0.05 g / mL; 2, the precursor solution is subjected to a hydrothermal reaction, a product obtained after the reaction is completed is washed and dried, and the vanadium sulfide nanoflower is obtained. The prepared vanadium sulfide nanoflower is of a three-dimensional structure, stacking of flake vanadium sulfide is well avoided, the specific surface area of vanadium sulfide is increased, the vanadium sulfide nanoflower is used as an electrode material of a supercapacitor, higher specific capacity can be obtained, the circulation service life is prolonged, and high energy density and power density are achieved; the maximum specific capacity of the prepared vanadium sulfide nanoflower can reach 500.4 F g<-1>, after circulation is conducted 500 times or above, the specificcapacity still reaches 459.4 F g<-1>, and the capacitance retention rate is 91.9%.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a method for preparing vanadium sulfide nanoflowers as an electrode material for supercapacitors. Background technique [0002] As a new energy storage device, supercapacitors have attracted great research interest due to their advantages such as long service life and high energy density. The active electrode materials of supercapacitors affect the electrochemical performance of energy storage devices to a great extent, so finding electrode materials with novel structures becomes the key to the development of supercapacitors. The micro-nano materials with three-dimensional hierarchical structure have important research significance due to their unique structure, physical and chemical properties, especially the synthesis and photoelectric properties of layered transition metal sulfide micro-nano structures have attracted widespread attention. . [0003] Vanadium di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24
CPCC01G31/00C01P2004/30H01G11/24H01G11/30Y02E60/13
Inventor 李鸿乂彭正武卜中林冯俊恺谢兵
Owner CHONGQING UNIV
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