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Vanadium tetrasulfide electrode material and preparation method and application thereof

A technology of vanadium tetrasulfide, electrode material, applied in chemical instruments and methods, negative electrodes, nanotechnology for materials and surface science, etc. Discharge performance and cycle performance, etc., to achieve the effect of simple process and strong implementation

Active Publication Date: 2018-11-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the contact area between the vanadium tetrasulfide electrode material prepared by the preparation method provided by the prior art and the electrolyte (mass) is limited, and the active interface is small, thereby limiting the charge-discharge performance and cycle performance of the vanadium tetrasulfide electrode material

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  • Vanadium tetrasulfide electrode material and preparation method and application thereof
  • Vanadium tetrasulfide electrode material and preparation method and application thereof
  • Vanadium tetrasulfide electrode material and preparation method and application thereof

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preparation example Construction

[0030] The invention provides a kind of preparation method of vanadium tetrasulfide electrode material, comprises the following steps:

[0031] a) mixing vanadium source, sulfur source and surfactant in a solvent to obtain a mixed solution; said surfactant is selected from polyvinylpyrrolidone, sodium dodecylbenzenesulfonate and cetyltrimethyl bromide One or more of ammonium chloride;

[0032] b) subjecting the mixed solution obtained in step a) to a solvothermal reaction, collecting solid products, washing and drying in sequence to obtain a vanadium tetrasulfide electrode material.

[0033] In the invention, the vanadium source, the sulfur source and the surfactant are firstly mixed in a solvent to obtain a mixed solution. In the present invention, the vanadium source is preferably selected from one or more of iron vanadate, indium vanadate, bismuth vanadate, silver vanadate, sodium metavanadate and sodium orthovanadate, more preferably iron vanadate , silver vanadate, sodi...

Embodiment 1

[0065] (1) Weigh 1.21g of sodium metavanadate into 60mL of ethanol and stir for 2h; weigh 2.89g of thiourea and 1.95g of sodium dodecylbenzenesulfonate into 20mL of methanol and stir for 3h; mix and stir the two solutions 0.5h, to obtain a uniform mixed solution;

[0066] (2) Put the mixed solution obtained in step (1) into a 100mL reactor for solvothermal reaction. The parameters of the solvothermal reaction are set as follows: the temperature is 100°C, and the time is 15h; method to collect the black powder obtained by the reaction, wash it several times and dry it to obtain VS 4 electrode material.

[0067] After testing, the VS provided by Example 1 of the present invention 4 The shape of the electrode material is nano-flaky hollow sphere with a diameter of about 8 μm and an inner diameter of 6 μm. The thickness of the shell is about 900 nm, and the thickness of the surface sheet of the spherical shell is about 60 nm. The specific SEM image is as follows figure 1 shown....

Embodiment 2

[0072] (1) Weigh 1.03g sodium orthovanadate and add it to 10mL ethanol, stir for 2h; weigh 3.97g thiourea and 1.85g hexadecyltrimethylammonium bromide, add it to 75mL methanol and stir for 3h; mix the two solutions Mix and stir for 0.5h to obtain a uniform mixed solution;

[0073] (2) Put the mixed solution obtained in step (1) into a 100mL reactor for solvothermal reaction. The parameters of the solvothermal reaction are set as follows: the temperature is 140°C, and the time is 15h; method to collect the black powder obtained by the reaction, wash it several times and dry it to obtain VS 4 electrode material.

[0074] After testing, the VS provided by Example 2 of the present invention 4The shape of the electrode material is a nano-sheet-shaped hollow sphere with a diameter of about 7 μm and an inner diameter of 5 μm. The thickness of the shell is about 900 nm, and the thickness of the surface sheet of the spherical shell is about 50 nm.

[0075] Battery assembly and testi...

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Abstract

The invention provides a preparation method of a vanadium tetrasulfide electrode material. The preparation method comprises the following steps: a) mixing a vanadium source, a sulfur source and a surfactant in a solvent to obtain a mixed solution, wherein the surfactant is selected from one or more of polyvinylpyrrolidone, sodium dodecylbenzenesulfonate and cetyltrimethylammonium bromide; b) carrying out solvothermal reaction of the mixed solution obtained in the step a), collecting solid products, and sequentially washing and drying to obtain the vanadium tetrasulfide electrode material. Thepreparation method realizes the nanocrystallization and shape design of the VS4 electrode material, and the electrode material has the special morphology of nanosheet hollow sphere, nanosphere, nanoparticle, nanosheet hollow tube or nano flower, so that the contact area between the electrode material and electrolytic media is increased, the interface impedance is reduced, and the rate performanceof a battery is improved. At the same time, a larger active interface can alleviate the volume change of the material during charging and discharging, so as to improve the charge and discharge performance and cycle performance of the material.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, and more specifically relates to a vanadium tetrasulfide electrode material and a preparation method and application thereof. Background technique [0002] With the rapid development of the current new energy vehicle industry, the performance and safety of power batteries have attracted people's attention. The accelerated replacement of electronic products also promotes the continuous development of portable batteries. Lithium-ion battery, as the main product in the secondary battery on the market, has the advantages of high working voltage, large specific energy, small self-discharge, and no memory effect. Traditional lithium-ion batteries usually use organic electrolyte as the lithium-ion conductive medium, which has safety problems such as flammability, corrosion, and poor thermal stability, which limits the application of lithium-ion batteries. At the same time, metal lithium will...

Claims

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Application Information

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IPC IPC(8): C01G31/00B82Y30/00H01M4/58H01M10/052
CPCB82Y30/00C01G31/00C01P2004/03C01P2004/61H01M4/5815H01M10/052H01M2004/021H01M2004/027Y02E60/10
Inventor 姚霞银丁照广张强
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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