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Preparation method of three-dimensional self-assembled flower-like tungsten disulfide electrode material

A technology of tungsten disulfide and electrode materials, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve problems such as structural damage, electrochemical performance attenuation, large volume expansion, etc., achieve good crystallinity, facilitate transmission, The effect of structural stability

Active Publication Date: 2019-01-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Tungsten disulfide has attracted extensive attention from researchers because of its large interlayer spacing, which is beneficial to the intercalation and deintercalation of sodium ions. However, it has a large volume expansion during charge and discharge, which leads to structural damage Rapid decay of electrochemical performance

Method used

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  • Preparation method of three-dimensional self-assembled flower-like tungsten disulfide electrode material
  • Preparation method of three-dimensional self-assembled flower-like tungsten disulfide electrode material
  • Preparation method of three-dimensional self-assembled flower-like tungsten disulfide electrode material

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Experimental program
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Effect test

Embodiment 1

[0028] Step 1: At room temperature, add 0.659g of sodium tungstate dihydrate into a mixed solution formed by 25mL of deionized water and 10mL of ethanol, and stir until completely dissolved to form a transparent solution A;

[0029] Step 2: Add 0.1g of ammonium acetate into the transparent solution A and stir until dissolved, then add 2mL of oleic acid into the transparent solution A, stir magnetically until the oleic acid is completely dissolved, the stirring speed is 500r / min, and the stirring time is 0.5h;

[0030] Step 3: Dilute concentrated hydrochloric acid into 2mol / L transparent solution B, add solution B dropwise to the above solution until the pH value of the solution is 1.5, transfer the solution to a polytetrafluoroethylene reactor for homogeneous reaction, the reaction temperature 180°C, reaction time 12h, after the reaction, freeze-dry after centrifugation to obtain WO 3 0.33H 2 O;

[0031] Step 4: Convert the obtained WO 3 0.33H 2 O powder was used as tungst...

Embodiment 2

[0033] Step 1: At room temperature, add 0.711g of sodium tungstate dihydrate into a mixed solution formed by 25mL of deionized water and 10mL of ethanol, and stir until completely dissolved to form a transparent solution A;

[0034] Step 2: Add 0.3g of ammonium acetate into the transparent solution A and stir until dissolved, then add 2mL of oleic acid into the transparent solution A, stir magnetically until the oleic acid is completely dissolved, the stirring speed is 400r / min, and the stirring time is 0.5h;

[0035] Step 3: Dilute concentrated hydrochloric acid into 1mol / L transparent solution B, add solution B dropwise to the above solution until the pH value of the solution is 1.4, transfer the solution to a polytetrafluoroethylene reactor for homogeneous reaction, and the reaction temperature 160°C, reaction time 12h, after the reaction, freeze-dry after centrifugation to obtain WO 3 0.33H 2 O;

[0036] Step 4: Convert the obtained WO 3 0.33H 2 O powder was used as tu...

Embodiment 3

[0038] Step 1: At room temperature, add 0.825g of sodium tungstate dihydrate into a mixed solution formed by 25mL of deionized water and 10mL of ethanol, and stir until completely dissolved to form a transparent solution A;

[0039] Step 2: Add 0.15g of ammonium acetate into the transparent solution A and stir until dissolved, then add 2mL of oleic acid into the transparent solution A, stir magnetically until the oleic acid is completely dissolved, the stirring speed is 500r / min, and the stirring time is 1h;

[0040] Step 3: Dilute concentrated hydrochloric acid into 2mol / L transparent solution B, add solution B dropwise to the above solution until the pH value of the solution is 1.5, transfer the solution to a polytetrafluoroethylene reactor for homogeneous reaction, the reaction temperature 180°C, reaction time 12h, after the reaction, freeze-dry after centrifugation to obtain WO 3 0.33H 2 O;

[0041]Step 4: Convert the obtained WO 3 0.33H 2 O powder was used as tungsten...

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Abstract

A preparation method of a three-dimensional self-assembled flower-like tungsten disulfide electrode material comprises the steps that sodium tungstate dihydrate is added into a mixed solution of deionized water and ethanol, stirring is performed till the sodium tungstate dihydrate is dissolved to form a transparent solution A, then ammonium acetate is added and stirred evenly, then oleic acid is added and mixed evenly, a pH value is regulated to 1.3 to 1.7, hydrothermal reaction is performed at the temperature of 160-180 DEG C for 12-24 hours, centrifugation and drying are performed to obtainWO3.0.33H2O powder; WO3.0.33H2O powder and thioacetamide are mixed according to the mole ratio of 1:20, and then calcination is performed to obtain the three-dimensional self-assembled flower-like tungsten disulfide electrode material. The hydrothermal synthesis method is utilized to add the oleic acid and ammonium acetate in the mixed alcohol water system to control the nucleation growth of tungsten trioxide and to control the morphology, the synthesis method is simple, easy to control and good in product dispersivity, and finally the three-dimensional self-assembled flower-like tungsten disulfide electrode material is obtained through vulcanization, is uniform in morphology and high in purity and has better application in the field of electrochemistry.

Description

technical field [0001] The present invention relates to WS 2 The technical field of nanomaterial preparation, in particular to a method for preparing a three-dimensional self-assembled flower-shaped tungsten disulfide electrode material. Background technique [0002] WS 2 The microscopic structure of the crystal is a lamellar structure, which belongs to the hexagonal crystal system, forming a S-W-S sandwich structure, and the adjacent sheets are combined by Van der Waals force. This weak bonding force is easy to be cut between layers, and different atoms The interlayer is combined by covalent bond, and the interlayer distance is large Makes it easy to slip between layers. [0003] Thanks to Nano WS 2 Good physical and chemical properties, broad application prospects, nano WS at home and abroad 2 Preparation has also been extensively studied. Common preparation methods include: hydrothermal method, chemical vapor deposition method, high energy ball milling method, etc....

Claims

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Application Information

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IPC IPC(8): C01G41/00
CPCC01G41/00C01P2002/72C01P2004/03
Inventor 黄剑锋罗晓敏李嘉胤曹丽云王蓉席乔王芳敏王泽坤
Owner SHAANXI UNIV OF SCI & TECH
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