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Nanorod-like vanadium tetrasulfide powder and preparation method and application thereof

A nanorod-shaped, vanadium tetrasulfide technology, applied in chemical instruments and methods, nanotechnology, nanotechnology, etc., can solve the problems of large volume change and low conductivity, and achieve low reaction temperature, high specific capacity, and simple operation Effect

Active Publication Date: 2019-09-27
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although, based on the above-mentioned special physical properties, vanadium tetrasulfide has high theoretical capacity, excellent charge-discharge rate performance and cycle performance, however, vanadium tetrasulfide also has some disadvantages, vanadium tetrasulfide is the same as other transition metal sulfides, During the intercalation / extraction process of lithium ions, the characteristics of low conductivity and large volume change will appear, hindering VS 4 Become a high-performance electrode material, Three-dimensional VS 4 / graphene hierarchical architecture as high-capacity anode for lithium-ion batteries,Lithium reaction mechanism and highrate capability ofVS 4 – graphene nanocomposite as an anode material for lithium batteries and other literatures have related reports

Method used

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  • Nanorod-like vanadium tetrasulfide powder and preparation method and application thereof
  • Nanorod-like vanadium tetrasulfide powder and preparation method and application thereof
  • Nanorod-like vanadium tetrasulfide powder and preparation method and application thereof

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Embodiment 1

[0036] Take 5mmol of thioacetamide (TAA) and add it to 70mL of absolute ethanol, then stir it with magnetic force for 1h to make it completely dissolved; then add 1mmol of ammonium metavanadate under magnetic stirring, and continue stirring for 1h to make it completely dissolve; keep stirring Add 1mL of dilute hydrochloric acid, stir for 0.5h to form a transparent solution; the above stirring speed is 300r / min-400r / min, transfer the above-mentioned mixed solution to the polytetrafluoroethylene lining of a 100mL stainless steel autoclave, and seal the stainless steel autoclave React the kettle and put it into a blast drying oven for 24 hours at 180°C; after cooling to room temperature naturally, wash the product four times with anhydrous ethanol, four times with deionized water and dry it in vacuum for 12 hours , that is, nano-rod vanadium tetrasulfide powder. figure 1 It is the SEM picture of the nanorod-shaped vanadium tetrasulfide prepared in this embodiment. Confirmed that...

Embodiment 2

[0042] Take 4mmol of thioacetamide (TAA) and add it to 60mL of absolute ethanol, then stir it with magnetic force for 2h to make it completely dissolved; then add 0.5mmol of ammonium metavanadate under magnetic stirring, and continue stirring for 2h to make it completely dissolve; keep stirring Add 1mL of dilute hydrochloric acid, stir for 1h to form a transparent solution; the above stirring speed is 300r / min~400r / min, transfer the above-mentioned mixed solution to the polytetrafluoroethylene lining of a 100mL stainless steel autoclave, and seal the stainless steel autoclave React the kettle and put it into a blast drying oven for 23 hours at 190°C; after cooling to room temperature naturally, wash the product four times with anhydrous ethanol, four times with deionized water and dry it in vacuum for 12 hours , that is, nano-rod vanadium tetrasulfide powder.

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Abstract

The invention discloses a preparation method of nanorod-like vanadium tetrasulfide powder. The method comprises the following steps: (1) dissolving thioacetamide in absolute ethyl alcohol, and stirring until whole dissolution is completed to obtain a mixture A; (2) adding ammonium vanadate to the mixture A, and stirring until whole dissolution is completed to obtain a mixture B; (3) dripping dilute hydrochloric acid into the mixture B under stirring conditions to form a transparent solution to obtain a mixture C; (4) transferring the mixture C to a hydrothermal reaction kettle, and carrying out a hydrothermal reaction for 24 to 25 hours; (5) after the reaction is finished, naturally cooling, performing centrifugal washing several times, and then performing vacuum drying to obtain the nanorod-like vanadium tetrasulfide powder. The nanorod-like vanadium tetrasulfide prepared by the method is higher in specific capacity, excellent in cycle stability, long in service life and higher in electrical conductivity.

Description

technical field [0001] The invention relates to the field of battery materials, and more specifically relates to a nano-rod vanadium tetrasulfide powder and a preparation method and application thereof. Background technique [0002] At present, the main problem facing ion batteries is still the exploration and design of high-performance anode materials. [0003] Graphite is widely used as an anode material in ion batteries, but the actual specific capacity of graphite anode materials is relatively low, which makes it difficult to meet people's growing energy storage needs. [0004] In order to find suitable anode materials for ion batteries, related researchers have extensively explored a number of compounds. Among these anode materials, researchers generally believe that metal sulfides with high theoretical capacity are very promising candidates, and tuning their nanostructure is a very important way to further improve their electrochemical performance. Strategy. [0005...

Claims

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Application Information

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IPC IPC(8): C01G31/00H01M4/58H01M10/0525H01M10/054B82Y30/00
CPCC01G31/00H01M4/5815H01M10/0525H01M10/054B82Y30/00C01P2004/03C01P2006/40C01P2006/80C01P2004/16Y02E60/10
Inventor 梁培董莹锋王丹满晓磊叶嘉明
Owner CHINA JILIANG UNIV
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