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A kind of nano-rod vanadium tetrasulfide powder and its preparation method and application

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 high purity, low reaction temperature, and controlled growth rate. Effect

Active Publication Date: 2022-02-11
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of nano-rod vanadium tetrasulfide powder and its preparation method and application
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  • A kind of nano-rod vanadium tetrasulfide powder and its preparation method and application

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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 dissolved; under constant stirring Add 1 mL of dilute hydrochloric acid, and stir for 0.5 h to form a transparent solution; the above stirring rates are all 300 r / min to 400 r / min, and the mixed solution obtained above is transferred to the polytetrafluoroethylene lining of a 100 mL stainless steel autoclave, and the stainless steel high pressure is sealed. The reaction kettle was put into a blast drying oven and reacted at 180°C for 24 hours; after cooling to room temperature naturally, the obtained product was centrifuged with anhydrous ethanol for four times, and deionized water was centrifuged for four times and vacuum dried for 12 hours. , that is, the nanorod-shaped vanadium tetrasulfide powder is obtained....

Embodiment 2

[0042] Take 4mmol of thioacetamide (TAA) and add it to 60mL of absolute ethanol, and 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 to stir for 2h to make it completely dissolved; keep stirring Add 1 mL of dilute hydrochloric acid and stir for 1 h to form a transparent solution; the above stirring rates are all 300 r / min to 400 r / min, and the mixed solution obtained above is transferred to the PTFE lining of a 100 mL stainless steel autoclave, and the stainless steel high pressure is sealed. The reaction kettle was put into a blast drying box and reacted at 190°C for 23 hours; after cooling to room temperature naturally, the obtained product was centrifuged with anhydrous ethanol for four times, and deionized water was centrifuged for four times and vacuum dried for 12 hours. , that is, the nanorod-shaped vanadium tetrasulfide powder is obtained.

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Abstract

The invention discloses a preparation method of nanorod-shaped vanadium tetrasulfide powder, which comprises the following steps: (1) dissolving thioacetamide into absolute ethanol and stirring until completely dissolved to obtain mixture A; (2) dissolving vanadium tetrasulfide Add ammonium acid to mixture A, stir until completely dissolved to obtain mixture B; (3) drop dilute hydrochloric acid into mixture B under stirring conditions to form a transparent solution to obtain mixture C; (4) transfer mixture C to hydrothermal In the reaction kettle, conduct hydrothermal reaction for 24-25 hours; (5) naturally cool after the reaction, centrifuge and wash several times, and vacuum-dry to obtain nanorod-shaped vanadium tetrasulfide powder. The nanorod vanadium tetrasulfide prepared by the invention has high specific capacity, excellent cycle stability, long service life and high conductivity.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a nano-rod-shaped vanadium tetrasulfide powder and a preparation method and application thereof. Background technique [0002] At present, the main problem faced by ion batteries is still the exploration and design of high-performance anode materials. [0003] Graphite is widely used as anode material in ion batteries, but the actual specific capacity of graphite anode material is relatively low, which is difficult to meet people's growing demand for energy storage. [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 a very promising class of candidates, and tuning their nanostructures is a very important way to further improve their electrochemical performance. Strategy. [0005...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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