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A vanadium disulfide nanosheet coated with vanadium hydroxide and its preparation method and application

A technology of vanadyl hydroxide package and vanadium disulfide, which is applied in impregnation manufacturing, electrode manufacturing, structural parts, etc., can solve the problems of insignificant electrochemical performance improvement, complex synthesis process, high cost, etc., and achieve improved cycle stability , high purity, simple and easy-to-control process

Active Publication Date: 2019-07-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these materials have no effect on VS 2 The suppression of volume expansion occurs only in the direction of the contact point, leading to insignificant improvement in electrochemical performance
In addition, these materials need to be prepared or purchased separately, making the whole synthesis process complicated, inefficient and costly

Method used

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  • A vanadium disulfide nanosheet coated with vanadium hydroxide and its preparation method and application
  • A vanadium disulfide nanosheet coated with vanadium hydroxide and its preparation method and application
  • A vanadium disulfide nanosheet coated with vanadium hydroxide and its preparation method and application

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preparation example Construction

[0040] A VOOH coated VS 2 The preparation method of nano sheet, comprises the following steps:

[0041] Step 1: Weigh sodium metavanadate and thioacetamide and add them into 55-65ml deionized water at the same time, control the vanadium-sulfur molar ratio to 1:2.5-1:3.5, stir magnetically for 20-40min to obtain a semi-clear solution A, At this time, the concentration of sodium metavanadate is 0.1-0.15 mol / L.

[0042] Step 2: Pour solution A into the reaction liner and seal it, then install the liner in the outer kettle and fix it, then place it in a homogeneous reactor, and then set it at 155-165°C under the condition of 5-15r / min Under the reaction 23 ~ 25h. Among them, the reaction filling ratio should be controlled at 55-65%. The reaction must be carried out under rotating conditions, which is conducive to the full and uniform contact of the reactants, so that VOOH can be guaranteed at VS 2 Uniform growth on the surface.

[0043] Step 3: After the hydrothermal reaction...

Embodiment 1

[0046] Step 1: Weigh sodium metavanadate and thioacetamide and add them to 60ml deionized water at the same time, control the molar ratio of vanadium to sulfur to be 1:3.0, and stir magnetically for 30 minutes to obtain semi-clear solution A. At this time, the concentration of sodium metavanadate It is 0.137mol / L.

[0047] Step 2: Pour solution A into the reaction liner and seal it, then install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and then react at 160°C for 24 hours under the condition of 10r / min. Among them, the reaction filling ratio should be controlled at 60%.

[0048] Step 3: After the hydrothermal reaction is completed, cool the reaction vessel to room temperature naturally, then take out the cooled product after the reaction, collect the product after 3 times of water washing and 3 times of alcohol washing alternately, and dry it at 60°C for 12 hours. You can get VOOH-coated VS 2 Nanosheets.

[0049] from figure 1 It can be ...

Embodiment 2

[0056] Step 1: Weigh sodium metavanadate and thioacetamide and add them to 55ml deionized water at the same time, control the molar ratio of vanadium to sulfur to be 1:2.5, and stir magnetically for 20 minutes to obtain semi-clear solution A. At this time, the concentration of sodium metavanadate It is 0.1mol / L.

[0057] Step 2: Pour solution A into the reaction liner and seal it, then install the liner in the outer kettle and fix it, place it in a homogeneous reactor, and then react at 155°C for 23 hours under the condition of 5r / min.

[0058] Step 3: After the hydrothermal reaction is completed, cool the reactor to room temperature naturally, then take out the cooled product after the reaction, wash it twice with water and wash it alternately with alcohol five times, then collect the product, and dry it at 55°C for 10 hours. You can get VOOH-coated VS 2 Nanosheets.

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Abstract

The invention provides a vanadium disulfide nanosheet coated with oxo-vanadium hydroxide and a preparation method and application thereof. The preparation method comprises the following steps: dissolving sodium metavanadate and thioacetamide in deionized water in a magnetic stirring state simultaneously; then, pouring the solution into a reaction lining for sealing, loading the lining into an outer kettle for fixing, and placing the outer kettle into a homogeneous phase reaction instrument; lastly, cooling a reaction product, washing, collecting and drying to obtain the VOOH-coated VS2 nanosheet. The VOOH-coated VS2 nanosheet prepared by the method has uniform chemical composition, higher purity, uniform appearance and a specific self-assembly structure, and shows superior electrochemical performance when being taken as a sodium-ion battery electrode material. Moreover, by adopting the method, the defect of high temperature in a conventional calcining method is overcome, and large-sized equipment and severe reaction conditions are not needed; the vanadium disulfide nanosheet has the advantages of adoption of cheap and readily-available raw materials, low cost, high yield, no need of posttreatment and environmental friendliness, and can be suitable for large-scale production.

Description

[0001] 【Technical field】 [0002] The invention relates to a preparation method of a composite material, in particular to a VOOH-coated VS 2 Preparation methods and applications of nanosheets. [0003] 【Background technique】 [0004] Because of the wide distribution and low cost of sodium, sodium-ion batteries have attracted more and more attention as the next-generation large-scale energy storage system. In order to find suitable anode materials for Na-ion batteries, researchers have explored a large number of active materials experimentally. Among these anode materials, due to their layered structure with suitable interlayer space, transition metal dichalcogenides such as MoS 2 、WS 2 and VS 2 etc. are considered a very promising candidate. Although recent studies have shown that MoS 2 and WS 2 They can exhibit excellent sodium storage properties, but their poor electron transport properties caused by their semiconducting properties limit their further development. As ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58
CPCH01M4/0416H01M4/5815Y02E60/10
Inventor 黄剑锋李文斌曹丽云冯亮亮李瑞梓
Owner SHAANXI UNIV OF SCI & TECH
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