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Preparation method of self-assembled flaky VS2/S nanosheet

A self-assembly, nanosheet technology, applied in the preparation/purification of sulfur, chemical instruments and methods, vanadium compounds, etc., can solve the problems of hysteretic electrochemical reaction, poor rate performance, etc. Active sites, the effect of increasing interlayer space

Inactive Publication Date: 2021-08-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, vanadium disulfide will show a hysteresis electrochemical reaction in the reaction, showing poor rate performance.

Method used

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  • Preparation method of self-assembled flaky VS2/S nanosheet
  • Preparation method of self-assembled flaky VS2/S nanosheet
  • Preparation method of self-assembled flaky VS2/S nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First dissolve sodium metavanadate in 50ml of absolute ethanol, and stir at room temperature for 30min at a speed of 500r / min to obtain a mixed solution with a vanadium source concentration of 0.16mol / L; slowly add 0.07g of hexadecyltrimethyl bromide Ammonium chloride, stirred at room temperature at a speed of 600r / min for 20min; according to the molar ratio of V:S of 1:4, thioacetamide was added to the solution, and stirred at room temperature at a speed of 600r / min for 60min to obtain the sulfur source A mixed solution with a concentration of 0.64mol / l, transfer the mixed solution to a polytetrafluoroethylene lining with a filling ratio of 55%, conduct a solvothermal reaction at 160°C for 24 hours, and collect the product by suction filtration with water and absolute ethanol Alternately washed three times and freeze-dried for 12 hours to obtain a vanadium-sulfur composite material.

Embodiment 2

[0030] First, dissolve sodium metavanadate in 50ml of absolute ethanol, and stir for 30min at room temperature at a speed of 600r / min to obtain a mixed solution with a vanadium source concentration of 0.13mol / L; slowly add 0.1g of hexadecyltrimethyl bromide Ammonium chloride, stirred at room temperature at a speed of 500r / min for 30min; according to the molar ratio of V:S of 1:4.5, thiourea was weighed and added to the solution, and stirred at room temperature at a speed of 500r / min for 60min to obtain the sulfur source concentration It is a mixed solution of 0.59mol / L, and the mixed solution is transferred to the lining of polytetrafluoroethylene, the filling ratio is 65%, and the solvothermal reaction is carried out at 180°C for 18h, and the product is collected by suction filtration, and then water and absolute ethanol are alternately Washed three times and freeze-dried for 12 hours to obtain a vanadium-sulfur composite material.

[0031] figure 1 For the self-assembled sh...

Embodiment 3

[0035] First, dissolve vanadium chloride in 50ml of absolute ethanol, and stir for 30min at room temperature at a speed of 700r / min to obtain a mixed solution with a vanadium source concentration of 0.2mol / L; slowly add 0.3g of hexadecyltrimethyl bromide For ammonium, stir at room temperature at a speed of 700r / min for 10min; weigh thiourea amine at a molar ratio of V:S of 1:5 and add it to the solution, and stir at room temperature for 60min at a speed of 700r / min to obtain a sulfur source concentration of 1mol / L mixed solution, transfer the mixed solution to the inner liner of polytetrafluoroethylene, the filling ratio is 75%, carry out solvothermal reaction at 200°C for 12h, collect the product by suction filtration and wash it alternately with water and absolute ethanol three times And freeze-dried for 12 hours to obtain a vanadium-sulfur composite material.

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Abstract

The invention discloses a preparation method of a self-assembled flaky VS2 / S nanosheet, which comprises the following steps: step 1, weighing a vanadium source, adding the vanadium source into absolute ethyl alcohol, and stirring by using a magnetic stirrer at room temperature to obtain a solution A with the vanadium source concentration of 0.13-0.2 mol / L; step 2, weighing 0.07-1 g of hexadecyl trimethyl ammonium bromide as a surfactant and an intercalator, slowly adding the hexadecyl trimethyl ammonium bromide into the solution A, and stirring by using a magnetic stirrer at room temperature to obtain a solution B; step 3, weighing a sulfur source, adding the sulfur source into the solution B, and stirring by using a magnetic stirrer at room temperature to obtain a solution C with the sulfur source concentration of 0.59-1.04 mol / L; step 4, transferring the solution C into a polytetrafluoroethylene lining, putting the polytetrafluoroethylene lining into a drying oven, and carrying out solvothermal reaction at the reaction temperature of 160-200 DEG C for 4-24 hours; step 5, collecting a solvothermal reaction product in a suction filtration manner, washing, and freeze-drying for 12 hours to obtain a vanadium disulfide sulfur composite material. The preparation method adopts a one-step solvothermal method, and is simple in process, low in energy consumption and high in yield.

Description

technical field [0001] The invention belongs to the field of battery electrode materials, in particular to a self-assembled sheet VS 2 / S nanosheet preparation method. Background technique [0002] Due to the increasing demand for renewable energy, its intermittent storage characteristics also require the rapid development of energy storage devices. Lithium-ion batteries have been widely used in daily life. However, with the real advent of smart grid, large-scale energy storage system of renewable energy and the era of electric vehicles, limited by lithium resource reserves (~17ppm) and uneven distribution (~70% in South America) (especially in my country At present, 80% of lithium resources rely on imports), and it is difficult for lithium-ion batteries to support the development of the two major industries of electric vehicles and grid energy storage at the same time. The sodium-ion battery also has good power characteristics, wide temperature range adaptability, safety ...

Claims

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Application Information

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IPC IPC(8): C01G31/00C01B17/02
CPCC01G31/00C01B17/0253C01P2002/72C01P2004/03C01P2004/20C01P2004/80C01P2006/40
Inventor 黄剑锋王羽偲嘉李嘉胤曹丽云罗晓敏胡云飞王芳敏王瑜航
Owner SHAANXI UNIV OF SCI & TECH
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