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Polyoxometalate-graphene nano composite material and preparation method and application thereof

A technology of polyoxometalate and nanocomposite materials, which is applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of low cycle stability, small specific capacity, complex process, etc., and achieve simplified preparation steps , good specific capacity, simple operation

Active Publication Date: 2019-09-24
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention mainly solves the existing problems of complex process, high cost, small specific capacity and low cycle stability in the existing methods for preparing graphene and oxo-acid nanomaterials, and provides a graphene (RGO) using reducing properties. and Keggin-type molybdenum polyacids ([PMo 12 o 40 ] 3- ) Covalently combined to prepare polyoxometalate-graphene nanocomposites

Method used

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  • Polyoxometalate-graphene nano composite material and preparation method and application thereof
  • Polyoxometalate-graphene nano composite material and preparation method and application thereof
  • Polyoxometalate-graphene nano composite material and preparation method and application thereof

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Embodiment 1

[0037] A preparation method of polyoxometalate-graphene nanocomposite material, comprising the following steps:

[0038] (1) Preparation of amino ionic liquid: Dissolve 9.0 g 0.1 mol of 1-methylimidazole and 22 g 0.1 mol of 2-ethylamine hydrobromide in 50 mL of acetonitrile, stir at 80 °C for 4 h, then add 5 g Mix with 0.1 mol sodium hydroxide, filter to remove the sodium bromide precipitate, and then extract the clear liquid with acetonitrile to obtain a waxy liquid, which is amino ionic liquid (AIL);

[0039] (2) Preparation of reduced graphene: 135 mg graphene and 146 mg hydrazine hydrate (mass fraction 80%) were reacted at 110 °C for 80 min, the product was centrifuged, washed with ethanol and distilled water to obtain reduced graphene (RGO) ;

[0040] (3) Reaction of reduced graphene with amino ionic liquid: take 95 mg of RGO in step (2) and 18 mL of thionyl chloride and reflux at 70 °C for 24 hours to acylchloride RGO, at 12000 r min -1 After centrifugation for 5 minut...

Embodiment 2

[0045] A preparation method of polyoxometalate-graphene nanocomposite material, comprising the following steps:

[0046] (1) Preparation of amino ionic liquid: Dissolve 8.2 g 0.1 mol of 1-methylimidazole and 20.5 g 0.1 mol of 2-ethylamine hydrobromide in 50 mL of acetonitrile, stir at 100 °C for 6 h, and then add 4.5 g 0.1 mol sodium hydroxide and mix well, filter to remove the sodium bromide precipitate generated in the reaction, extract with acetonitrile to obtain a waxy liquid which is amino ionic liquid (AIL);

[0047] (2) Preparation of reduced graphene: 135 mg graphene and 150 mg hydrazine hydrate (mass fraction 80%) were reacted at 110 °C for 90 min, the product was centrifuged, washed with ethanol and distilled water to obtain reduced graphene (RGO) ;

[0048](3) Reaction of reduced graphene with amino ionic liquid: Take 95 mg of RGO in step (2) and 19 ml of thionyl chloride and reflux at 70 °C for 12 hours, then carry out acyl chloride on RGO, at 10000 r min -1 Afte...

Embodiment 3

[0051] A preparation method of polyoxometalate-graphene nanocomposite material, comprising the following steps:

[0052] (1) Preparation of amino ionic liquid: Dissolve 9 g 0.1 mol 1-methylimidazole and 20.5 g 0.1 mol 2-ethylamine hydrobromide in 50 mL of acetonitrile, stir at 90°C for 5 h, then add 4 g 0.1 mol sodium hydroxide and mix well, filter to remove the sodium bromide precipitate generated in the reaction, extract the above solution with acetonitrile (5mL×3) to obtain a waxy liquid which is amino ionic liquid (AIL);

[0053] (2) Preparation of reduced graphene: 135 mg graphene and 135 mg hydrazine hydrate (mass fraction 80%) were reacted at 100︒C for 80 minutes, the product was centrifuged, washed with ethanol and distilled water to obtain reduced graphene (RGO) ;

[0054] (3) Reaction of reduced graphene with amino ionic liquid: take 90 mg of RGO in step (2) and 18 mL of thionyl chloride, reflux at 80 °C for 24 h, then reflux at 10000 r min -1 After centrifuging fo...

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Abstract

The invention belongs to the technical field of metal oxide nano materials, and specifically relates to a polyoxometalate-graphene nano composite material and a preparation method and an application thereof. The invention mainly aims to solve the problems of high cost, low density and poor discharge capacity under high current density of lithium-ion batteries. The nano composite material capable of improving the capacitive performance of the lithium-ion batteries is prepared by combining graphene and polyoxometalate. The preparation method is simple in process, convenient to operate and low in cost input. The prepared polyoxometalate-graphene nano composite material has higher specific capacitance and better cycling stability and rate performance compared with pure polyacid. The prepared material has important application value in the field of the lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of metal oxide nanomaterials, and in particular relates to a polyoxometalate-graphene nanocomposite material, its preparation method and its application as a lithium ion battery cathode material. Background technique [0002] In recent years, environmental pollution and energy shortage have attracted more and more attention from all over the world, and the development of environmentally friendly new energy materials has become a hot topic in the fields of physics, chemistry and material science. Lithium-ion batteries have gradually become an ideal energy-saving material due to their environmental friendliness, low discharge rate, light weight, and high energy density. However, most of the current lithium-ion batteries have high cost, low powder density, and high current conditions. The disadvantage of the lower specific capacity is small. How to find a material that can improve the shortcomings of lithium i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/364H01M4/5825H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 郝召民董青松王雅史晓雨楚意月
Owner HENAN UNIVERSITY
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