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Surface-nano-crystallized NbSe2 electrode material as well as preparation method and application thereof

A nano-nano technology, applied in chemical instruments and methods, battery electrodes, circuits, etc., can solve the problems of unreported electrode materials, and achieve the effects of market promotion, high discharge platform, and short synthesis time

Active Publication Date: 2018-11-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, NbSe 2 Materials have been studied as anode materials for lithium-ion batteries, but the surface nanometerized NbSe 2 Electrode materials are still unreported

Method used

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  • Surface-nano-crystallized NbSe2 electrode material as well as preparation method and application thereof
  • Surface-nano-crystallized NbSe2 electrode material as well as preparation method and application thereof
  • Surface-nano-crystallized NbSe2 electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Surface Nanoized NbSe 2 The preparation method comprises the following steps:

[0027] 1) Add 1.0g of dark gray NbSe 2 The block powder was added to 30mL of deionized water, followed by 10 minutes of ultrasonication and vigorous stirring for 15 minutes to fully disperse and dissolve the block powder;

[0028] 2) Transfer the suspension in step 1) to a microwave synthesizer, first keep it warm at 100°C for 5 minutes, then continue to heat up to 180°C and keep it warm for 12 hours. The heating rate of these two processes is 10°C / min;

[0029] 3) Wash the sample obtained in step 2) three times with water and one time with alcohol, and dry it in vacuum at 80°C to obtain the final black product NbSe 2 -M-12h.

[0030] With the product NbSe of this example 2 -M-12h as an example, its structure was determined by X-ray diffractometer. like figure 1 As shown, the X-ray diffraction pattern (XRD) shows that the original and microwave-treated samples are all hexagonal phase N...

Embodiment 2

[0034]Surface Nanoized NbSe 2 The preparation method comprises the following steps:

[0035] 1) Add 0.9g of dark gray NbSe 2 The block powder was added to 30mL of deionized water, followed by 10 minutes of ultrasonication and vigorous stirring for 15 minutes to fully disperse and dissolve the block powder;

[0036] 2) Transfer the suspension in step 1) to a microwave synthesizer, first heat it at 100°C for 5 minutes, then continue to heat up to 180°C and hold it for 11.5 hours. The heating rate of these two processes is 10°C / min;

[0037] 3) Wash the sample obtained in step 2) three times with water and one time with alcohol, and dry it in vacuum at 80°C to obtain the final black product NbSe 2 -M-12h.

[0038] With the surface nano-sized NbSe obtained in this example 2 For example, under the current density of 200 and 500mA / g, the initial capacity can reach 90 and 45mAh / g.

Embodiment 3

[0040] Surface Nanoized NbSe 2 The preparation method comprises the following steps:

[0041] 1) Add 1.0g of dark gray NbSe 2 The block powder was added to 32mL of deionized water, followed by 10 minutes of ultrasonication and vigorous stirring for 15 minutes to fully disperse and dissolve the block powder;

[0042] 2) Transfer the suspension in step 1) to a microwave synthesizer, first keep it warm at 100°C for 5 minutes, then continue to heat up to 180°C and keep it warm for 12 hours. The heating rate of these two processes is 10°C / min;

[0043] 3) Wash the sample obtained in step 2) three times with water and one time with alcohol, and dry it in vacuum at 80°C to obtain the final black product NbSe 2 -M-12h.

[0044] With the surface nano-sized NbSe obtained in this example 2 For example, under the current density of 200 and 500mA / g, the initial capacity can reach 92 and 48mAh / g.

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Abstract

The invention relates to a preparation method of surface-nano-crystallized NbSe2 through microwave-hydrothermal synthesis. The preparation method comprises the following steps: 1) adding NbSe2 block powder into deionized water, then performing ultrasonic stirring for fully dispersing and dissolving the block powder; 2) transferring a suspension prepared in step 1) into a microwave synthesizing instrument, keeping a low temperature for a certain while firstly, and then continuously heating and preserving heat; 3) washing a sample prepared in step 2), and drying the washed sample in vacuum to obtain a final black product. The preparation method has the beneficial effects that the surface-nano-crystallized NbSe2 shows superior multiplying power capacity and higher discharge plateau, and is apotential application material for high-energy-density magnesium cells. Secondly, the preparation method has the advantages of simple process, short synthesis time and mild conditions, meets the requirements of green chemistry, and contributes to market-oriented popularization.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemical devices, in particular to microwave hydrothermally synthesized surface nanometer NbSe 2 According to the preparation method, the material can be used as the positive electrode active material of the magnesium battery. Background technique [0002] Magnesium batteries (Magnesium batteries) have attracted extensive attention from researchers because of their high volumetric energy density, low cost and high safety. However, due to the strong electrostatic interaction between the magnesium ions themselves and the host ions due to their high ionic potential, the kinetics of magnesium ions intercalating into the positive electrode material is very slow. Therefore, finding a suitable positive electrode material that allows magnesium ions to be freely intercalated is one of the problems to be solved in the field of magnesium batteries. [0003] NbSe 2 As a typical transition ...

Claims

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Application Information

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IPC IPC(8): C01B19/00H01M4/58H01M10/054
CPCH01M4/581H01M10/054C01B19/007C01P2006/40C01P2004/03C01P2002/82C01P2002/72Y02E60/10
Inventor 安琴友彭陈麦立强盛进之
Owner WUHAN UNIV OF TECH
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