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MoSe2@C electrospinning hollow nano-fiber and preparation method and application thereof

A nanofiber and hollow technology, applied in the field of nanomaterials, can solve problems such as capacity loss, and achieve the effects of strong resistance, abundant reserves, and easy access to raw materials

Active Publication Date: 2019-07-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing MoSe 2 The material preparation method is mostly hydrothermal method, and the morphology is mostly microsphere or three-dimensional structure. If the specific surface area is too large, it will cause the formation of too much SEI film, resulting in the loss of capacity.

Method used

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  • MoSe2@C electrospinning hollow nano-fiber and preparation method and application thereof
  • MoSe2@C electrospinning hollow nano-fiber and preparation method and application thereof

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preparation example Construction

[0028] The present invention provides a MoSe 2 @C Electrospinning hollow nanofibers and preparation method thereof, with sodium molybdate, sodium selenite, ammonia and polyvinyl alcohol (PVA M W =83368) as raw material, deionized water as solvent, prepared MoSe by electrospinning 2 The method of @C hollow nanofibers, the specific steps are as follows:

[0029] S1. Dissolve water-soluble molybdenum salt in deionized water in proportion, and then stir on a magnetic stirrer for 5-10 minutes until the solution is transparent; the mass fraction of molybdenum source in ammonium molybdate tetrahydrate is 5-15%.

[0030] The water-soluble molybdate is ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O, the amount of ammonium molybdate is 1.0~2.5g;

[0031]S2. Slowly add 0.4-1.2 g of polyvinyl alcohol into the solution obtained in step S1, and stir at 60° C. for 8-12 hours until the solution becomes a transparent sol;

[0032] S3, use the transparent sol obtained in step S2 to carry...

Embodiment 1

[0043] Take by weighing 1.220g ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O), then dissolved in 10ml of deionized water, the solution was stirred under magnetic stirring for 5min, after stirring evenly, polyethylene glycol was slowly added to the homogeneous transparent solution obtained in the above steps, the water temperature was maintained at 60°C, and magnetic stirring was carried out for 8h Until a stable transparent sol was obtained, the electrospinning precursor was obtained, and then spinning was performed at a constant speed of 0.4ml / h when the electrospinning voltage was 15kv and the spinning jet was 16cm away from the collector. Next, the obtained nanofibers were collected and dried overnight in a vacuum oven at 60°C, and then stabilized at 180°C and 300°C for 0.5 h respectively, and then the dried nanofibers were heated in Ar(95%) / H 2 (5%) sintering in the atmosphere, reduction at 500 ° C for 3 h, the heating rate is 3 ° C / min, to obtain carbon-coated MoO ...

Embodiment 2

[0045] Weigh 1.500g ammonium molybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O), then dissolved in 10ml of deionized water, the solution was stirred under magnetic stirring for 6min, after stirring evenly, polyethylene glycol was slowly added to the homogeneous transparent solution obtained in the above steps, the water temperature was maintained at 60°C, and magnetic stirring was carried out for 9h Until it becomes a stable transparent sol, the electrospinning precursor is obtained, and then, when the electrospinning voltage is 18kv, and the spinning jet is 17cm away from the collector, spinning is performed at a constant speed of 0.5ml / min. Next, the obtained nanofibers were collected and dried overnight in a vacuum oven at 60°C, and then stabilized at 180°C and 300°C for 0.5 h respectively, and then the dried nanofibers were heated in Ar(95%) / H 2 (5%) sintering in the atmosphere, reduction at 550 °C for 5 h, the heating rate is 1 °C / min, to obtain carbon-coated MoO 2 . Next, the ...

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Abstract

The invention discloses a MoSe2@C electrospinning hollow nano-fiber and a preparation method and application thereof. The preparation method comprises the steps that water-soluble molybdenum salt is dissolved into deionized water in a ratio, and magnatically stirred until the solution is transparent; polyvinyl alcohol is added, and stirring is conducted until the solution becomes transparent sol,wherein the mass fraction of a molybdenum source in ammonium molybdate tetrahydrate is 5-15%; the prepared transparent sol is subjected to electrostatic spinning to obtain nano-fiber containing MoO2;the nano-fiber is sintered in a tube furnace to obtain carbon-coated MoO2; the carbon-coated MoO2 is put into ammonium hydroxide for etching so as to obtain a hollow structure, and after centrifugal treatment, hollow nano-fiber is obtained; the hollow nano-fiber is added into a solution prepared from soluble selenium salt, hydrazine hydrate and deionized water, a hydrothermal reaction is carried out, and after centrifugal treatment and drying, the MoSe2@C hollow nano-fiber is obtained. The raw materials are easy to obtain, the preparation process is simple, controllable reaction conditions aremild, and the finished product is high in specific surface area, excellent in electrical conductivity and structural stability.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, in particular to a MoSe 2 @C Electrospun hollow nanofibers and their preparation methods and applications. Background technique [0002] Due to its high energy density, high operating voltage, long cycle life, and low self-discharge rate, lithium-ion batteries have been widely used in various portable electronic products, pure electric motors, and hybrid vehicles. However, due to the high production cost and resource shortage of lithium-ion batteries, it is difficult to meet the requirements of long-term development in the future. The working mechanism of potassium-ion batteries is similar to that of lithium-ion batteries. Compared with lithium resources in lithium-ion batteries, potassium resources are widely distributed (the abundance in the earth's crust is 2.09%, about 1200 times that of lithium elements), and the price is relatively low. Due to the natural advantages of low cost, pot...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01F1/08H01M4/136H01M4/36H01M4/58H01M4/62H01M10/04H01M10/0525B82Y40/00
CPCB82Y40/00D01F1/08D01F9/08H01M4/136H01M4/366H01M4/581H01M4/625H01M4/628H01M10/0427H01M10/0525Y02E60/10Y02P70/50
Inventor 锁国权李欢欢李丹杨艳玲侯小江冯雷张荔叶晓慧
Owner SHAANXI UNIV OF SCI & TECH
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