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A graphene-supported porous vanadium dioxide microsphere composite material and a preparation method thereof

A technology of vanadium dioxide and composite materials, applied in the field of electrochemistry, can solve the problems of low experimental conditions, hinder development, unsatisfactory capacity and cycle stability, etc., achieve simple preparation process, alleviate structural degradation, improve structural stability and Effects of Electron Conduction Properties

Inactive Publication Date: 2019-01-11
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its relatively harsh experimental conditions and low capacity and cycle stability cannot meet the requirements of today's energy storage devices, hindering its further development

Method used

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  • A graphene-supported porous vanadium dioxide microsphere composite material and a preparation method thereof
  • A graphene-supported porous vanadium dioxide microsphere composite material and a preparation method thereof
  • A graphene-supported porous vanadium dioxide microsphere composite material and a preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a graphene-supported porous vanadium dioxide microsphere, the method steps are as follows:

[0038] 1) Add 116.98 mg of NH to 25 mL of deionized water 4 VO 3 powder, stir and disperse;

[0039] 2) 0.5 mL of HCl (1M) was added dropwise to the dispersion obtained in step 1), and stirred until dissolved;

[0040] 3) 1.5 mL of hydrazine hydrate was added dropwise to the solution obtained in step 2), and stirred for 30 min;

[0041] 4) dropwise adding graphene oxide aqueous solution (the amount of graphene oxide is 11 mg) to the suspension obtained in step 3), after stirring and dispersing, freeze-drying for 24 h to obtain a precursor;

[0042]5) The precursor obtained in step 4) is calcined at 450° C. for 2 h at a heating rate of 2° C. / min in a nitrogen atmosphere to obtain a graphene-supported porous vanadium dioxide microsphere composite material.

[0043] The XRD results of the precursor are as follows figure 1 As shown, the crystallinity of t...

Embodiment 2

[0053] 1) Add 93 mg of NH to 25 mL of deionized water 4 VO 3 powder, stir and disperse to obtain a dispersion;

[0054] 2) 0.4 mL of HCl (1M) was added dropwise to the dispersion obtained in step 1), and stirred until dissolved;

[0055] 3) 1.2 mL of hydrazine hydrate was added dropwise to the solution obtained in step 2), and stirred for 20 min to obtain a suspension;

[0056] 4) dropwise add graphene oxide aqueous solution (the amount of graphene oxide is 6 mg) to the suspension obtained in step 3), stir and disperse and freeze-dry for 24h to obtain a precursor;

[0057] 5) The precursor obtained in step 4) is calcined at 400° C. for 4 hours at a heating rate of 3° C. / min in a nitrogen atmosphere to obtain a graphene-supported porous vanadium dioxide microsphere composite material.

[0058] The XRD results of the precursor show that the crystallinity of the precursor is poor, and no obvious diffraction peaks are detected, indicating that it mainly presents an amorphous st...

Embodiment 3

[0066] 1) Add 140mg NH to 25mL deionized water 4 VO 3 powder, stir and disperse to obtain a dispersion;

[0067] 2) 0.6 mL of HCl (1M) was added dropwise to the dispersion obtained in step 1), and stirred until dissolved;

[0068] 3) 1.8 mL of hydrazine hydrate was added dropwise to the solution obtained in step 2), and stirred for 30 min to obtain a suspension;

[0069] 4) dropwise adding graphene oxide aqueous solution (the amount of graphene oxide is 16mg) to the suspension obtained in step 3), after stirring and dispersing, freeze-drying for 24h to obtain a precursor;

[0070] 5) The precursor obtained in step 4) is calcined at 500° C. for 1 h at a heating rate of 1.5° C. / min in a nitrogen atmosphere to obtain a graphene-supported porous vanadium dioxide microsphere composite material.

[0071] The XRD results of the precursor show that the crystallinity of the precursor is poor, and no obvious diffraction peaks are detected, indicating that it mainly presents an amorph...

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Abstract

The invention belongs to the technical field of electrochemistry, in particular to a porous vanadium dioxide microsphere composite material supported by graphene and a preparation method thereof. 8 to20 percent of graphene and 80 to 92 percent of porou vanadium dioxide microspheres, base on 100 percent of that mass of the material; the diameter of porous vanadium dioxide microspheres is 200 - 400nm, and the porous vanadium dioxide microspheres are uniformly adhered to the graphene sheets. The method comprises the following steps: NH4VO3 powder is dispersed in deionized water, HCl is added and stirred until dissolved; then adding hydrazine hydrate, stirring, finally adding graphene oxide aqueous solution, stirring and dispersing, freeze-drying, calcining the obtained precursor at 400-500DEG C for 1-4h under nitrogen, and obtaining the precursor; the composite material has excellent cycle stability and high rate performance when applied to sodium ion batteries. The method has simple process and is easy to be produced on a large scale.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a graphene-supported porous vanadium dioxide microsphere composite material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of portable electronic devices and hybrid electric vehicles, research on energy-efficient, resource-rich and environmentally friendly energy storage materials is a necessary condition for the sustainable and stable development of human society. At present, lithium-ion batteries are the most promising high-energy battery system. However, with the increasing dependence on lithium-ion batteries in industries such as digital and transportation, limited lithium resources will inevitably increase the cost of lithium batteries and affect their further development and application. Metal sodium and metal lithium coexist in the main group I, with similar physical and chemical properties, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/054
CPCH01M4/362H01M4/366H01M4/48H01M4/583H01M10/054Y02E60/10
Inventor 陈人杰赵露滋谢嫚黄永鑫罗锐吴锋李丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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