Preparation method of vanadium nitride nanoparticle composite material for lithium-sulfur battery

A technology of vanadium nitride nanometer, lithium-sulfur battery, applied in nitrogen compounds, lithium storage batteries, chemical instruments and methods, etc., can solve the problems of ammonia corrosiveness and limit large-scale synthesis, and achieve the promotion of sulfur utilization efficiency and high energy density. And the effect of cycle stability and easy operation

Inactive Publication Date: 2021-06-15
FUJIAN NORMAL UNIV
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Problems solved by technology

Vanadium nitride is often used as the host material of sulfur because of its structural stability, high electrical conductivity, good catalytic activity and strong polysulfide adsorption, but the synthesis of vanadium nitride usually uses ammonia as nitrogen source, the corrosiveness of ammonia and the complexity of operation limit its large-scale synthesis

Method used

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  • Preparation method of vanadium nitride nanoparticle composite material for lithium-sulfur battery
  • Preparation method of vanadium nitride nanoparticle composite material for lithium-sulfur battery
  • Preparation method of vanadium nitride nanoparticle composite material for lithium-sulfur battery

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preparation example Construction

[0031] (2) Preparation of lithium-sulfur battery positive electrode and battery assembly: The sulfur positive electrode composite material in Example 1 was prepared using the traditional melt-diffusion method, and the obtained sulfur positive electrode composite material, conductive agent, polyvinylidene fluoride binder, and The ratio of 75:15:10 was stirred in N-methylpyrrolidone solvent to form a uniform slurry, which was coated on aluminum foil with a doctor blade, dried at 60 °C for 24 h, compacted with a roller press, and cut into 14mm circles The sheet is used as the positive electrode of lithium-sulfur battery. Lithium metal is used as the negative electrode, and Celgard 2400 polypropylene diaphragm is used. The electrolyte used is dissolved in 1,3-dioxolane and ethylene glycol dimethyl ether (volume ratio: 1:1) with a concentration of 1 mol L -1 Lithium bis(trifluoromethane)sulfonylimide solution. 1 wt% of anhydrous lithium nitrate was added as an additive, and the b...

Embodiment 1

[0036] (1) Mix 50 mg carbon nanotubes, 100 mg (0.22 mol) 1,2,4,5-tetrabromomethylbenzene and 70 mg (0.25 mol) 1,3,5-tris(1-imidazolyl)benzene Stir ultrasonically in 80 mL of DMF for 1 h, then heat at 110 °C for 12 h. The resulting solid powder was washed with DMF and ethanol several times, and after vacuum drying, a composite material of ionic polymer-coated carbon nanotubes was obtained;

[0037] (2) Add 150 mg of the composite material obtained in step (1) to 50 mL of an aqueous solution containing 750 mg of sodium metavanadate, stir at room temperature for 24 h, wash the solid powder with water, and freeze-dry to obtain metavanadate-containing A composite material of vanadate ion polymer coated carbon nanotubes;

[0038](3) The composite material obtained in step (2) was placed in a porcelain boat and sealed in a quartz tube, and pyrolyzed at 800 °C for 2 h in a nitrogen atmosphere, and the vanadium nitride nanoparticle composite material was obtained after natural cooling...

Embodiment 2

[0044] (1) Mix 50 mg carbon nanotubes, 200 mg (0.44 mol) 1,2,4,5-tetrabromomethylbenzene and 100 mg (0.48 mol) 1,4-bis(1-imidazolyl)benzene in 100 mL DMF was stirred ultrasonically for 1 h, and then heated at 110 °C for 12 h. The resulting solid powder was washed with DMF and ethanol several times, and after vacuum drying, a composite material of ionic polymer-coated carbon nanotubes was obtained;

[0045] (2) Add 100 mg of the composite material obtained in step (1) to 80 mL of an aqueous solution containing 600 mg of sodium metavanadate, stir at room temperature for 24 h, wash the solid powder with water, and freeze-dry to obtain metavanadate-containing A composite material of vanadate ion polymer coated carbon nanotubes;

[0046] (3) Put the composite material obtained in step (2) into a porcelain boat and seal it in a quartz tube. o C and nitrogen atmosphere pyrolysis for 2 h, after natural cooling, the vanadium nitride nanoparticle composite material was obtained.

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Abstract

The invention discloses a preparation method of a vanadium nitride nanoparticle composite material for a lithium-sulfur battery, and belongs to the field of new energy materials. A conductive material with specific morphology is used as a template, a layer of imidazolyl ionic polymer uniformly coats the surface of the conductive material by quaternization reaction, and the conductive material is used as the only carbon source and nitrogen source. Then, metal-containing anions such as metavanadate radicals are introduced through anion exchange reaction, high-temperature roasting is carried out in an inert atmosphere, and the compound of the nitrogen-doped porous carbon-coated conductive material embedded with the vanadium nitride nanoparticles is obtained. The composite material prepared by the invention can avoid the use of corrosive ammonia gas, and the vanadium nitride nanoparticles are uniformly distributed, have high conductivity and polarity and good electrocatalysis effect, and can improve the utilization rate of sulfur and inhibit the shuttle effect of polysulfide, thereby improving the discharge capacity and cycle life of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to the preparation of a vanadium nitride nanoparticle composite material for lithium-sulfur batteries. Background technique [0002] With the growing demand for intermittent renewable energy, the development of energy storage devices with high energy density and long lifetime has attracted great attention. Lithium-sulfur batteries are regarded as one of the most promising next-generation high-capacity storage systems due to their high theoretical specific capacity and energy density, as well as the advantages of sulfur such as low cost, environmental friendliness, and abundant resources. However, the commercial application of lithium-sulfur batteries is still limited by some technologies, such as the poor conductivity of solid sulfur and lithium sulfide, the shuttling effect of soluble polysulfides, and the volume change of electrodes during charge-discharge cycles, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01B32/00C01B32/168C01B32/198H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCC01B21/0617C01B32/00C01B32/168C01B32/198H01M4/628H01M4/625H01M10/052B82Y30/00B82Y40/00C01P2004/80C01P2006/40Y02E60/10
Inventor 李小菊孟雪萍
Owner FUJIAN NORMAL UNIV
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