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Method for synthesizing mesocarbon microbead micro-nano composite material by microwave radiation method and application of composite material

A technology of mesophase carbon microspheres and microwave radiation method, which is applied in the field of preparation of micro-nano composite materials, can solve the problems of low positive current density, large polarization, and less microstructure, and achieve no temperature hysteresis effect, regular structure, The effect of simple process

Inactive Publication Date: 2011-09-28
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, problems such as low current density and large polarization of the positive electrode, electrolyte carbonation and water evaporation loss have always restricted the vigorous development of metal-air batteries. Therefore, research on positive electrode redox catalysts has become the focus of solving the above problems.
[0006] To sum up, researchers at home and abroad have achieved fruitful results in the research of mesophase carbon microspheres in the fields of lithium-ion batteries, supercapacitors and metal-air batteries, but there are still some scientific problems; mainly reflected in: composite The types of materials for mesocarbon microspheres are still relatively limited; the self-assembled microstructures are relatively few, especially for the composition, microstructure and energy storage properties of complex compounds.

Method used

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  • Method for synthesizing mesocarbon microbead micro-nano composite material by microwave radiation method and application of composite material
  • Method for synthesizing mesocarbon microbead micro-nano composite material by microwave radiation method and application of composite material
  • Method for synthesizing mesocarbon microbead micro-nano composite material by microwave radiation method and application of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: MnO 2 Preparation of Nanosphere / MCMB Composite

[0046] At room temperature, 1.5 grams of MCMB was dispersed in a 10% ethanol aqueous solution by mass ratio, and 0.2 grams of potassium permanganate solid was added to this solution, and mixed for 15 minutes under a magnetic stirrer to make the potassium permanganate solution fully adsorbed to the surface of MCMB spheres; then add 1.25mL of 50% Mn(NO 3 ) 2 The concentrated solution was vigorously stirred for 10 minutes, and reacted in a microwave irradiation reactor for 30 minutes. After the reaction, the obtained product was subjected to centrifugation, distilled water washing and absolute ethanol washing several times. The product is MnO 2 Nanosheet / MCMB micro-nano composite. Scanning electron microscopy (SEM) tests showed that ( figure 1 , figure 2 ): The main morphology of the product is that the surface of carbon spheres is ultrafine nanoparticles with uniform dispersion and uniform diameter; Figu...

Embodiment 2

[0047] Example 2: MnO 2 Preparation of Ultralong Nanowire / MCMB Micro / Nano Composite

[0048] At room temperature, disperse 1.5 grams of MCMB powder in 10% ethanol aqueous solution, add 0.4 grams of potassium permanganate solid, and mix for 15 minutes under magnetic stirring, so that the potassium permanganate solution is fully adsorbed to the MCMB sphere surface; add 2.5 mL of 50% Mn(NO 3 ) 2 The concentrated solution was vigorously stirred for 10 minutes, and reacted in a microwave irradiation reactor for 30 minutes. After the reaction, the obtained product was subjected to centrifugation, distilled water washing and absolute ethanol washing several times. The product is MnO 2 Ultra-long nanowire / MCMB micro-nano composite. The SEM test showed that ( image 3 , Figure 4 ): The main shape of the product is mesophase carbon microspheres with a diameter of 20 μm, and the array MnO is uniformly grown on the surface 2 nanoneedle; by Image 6 The high-magnification scanning...

Embodiment 3

[0049] Embodiment 3: Preparation of zinc vanadate nanoparticles / MCMB composite micro-nano material

[0050] At room temperature, accurately weigh the zinc nitrate solid, use distilled water as the solvent, and configure a solution with a molar concentration of 0.00125 mol / L; weigh a certain mass of ammonium metavanadate solid to make the ratio of the number of moles to the number of moles of zinc nitrate 1:2, add hot distilled water at 60-75°C to ammonium metavanadate, stir until completely dissolved to obtain a homogeneous solution, add 10wt% absolute ethanol, then add 1.5 grams of MCMB powder to the above solution, and stir for 15 Minutes until the suspension is evenly dispersed, then transfer the zinc nitrate solution to the mixed suspension of ammonium metavanadate and MCMB powder, and stir vigorously for 10 minutes; transfer the mixture to a round bottom flask and place it in a microwave irradiation reactor React in medium for 30 minutes, and the product after the reactio...

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Abstract

The invention relates to a method for synthesizing a mesocarbon microbead micro-nano composite material by adopting a microwave radiation method and application of the composite material. In the invention, research is developed around the scientific problem of application of mesocarbon microbeads in the energy storage field, multiple micro-nano composite materials are designed and synthesized in a microwave radiation reaction system, manganese oxide, metal vanadate and metal molybdate materials are grown on the surfaces of the mesocarbon micro-beads in situ, and composition and microstructureof the material can be controlled through adjusting key parameters of an experiment. The material compounding method has the characteristics of no temperature hysteresis effect, mild reaction, simpleprocess, energy conservation, high yield and the like; and the material prepared by the material compounding method disclosed by the invention can provide necessary theoretical basis and practical experience for research in the fields such as energy storage and conversion, luminous functional devices, biomedicine and the like.

Description

technical field [0001] The patent of the present invention belongs to the technical field of preparation of micro-nano composite materials, especially relates to the synthesis technology of key electrode materials in functional energy storage devices, especially a method and application of synthesizing mesophase carbon microsphere micro-nano composite materials by microwave radiation method; By adjusting the experimental parameters, zero-dimensional / one-dimensional / two-dimensional / three-dimensional micro-nano functional materials can be selectively uniformly compounded on the surface of carbon microspheres. technical background [0002] In recent years, the electrochemical systems of lithium-ion batteries, supercapacitors, and metal-air batteries have become the focus of the development of high-energy chemical energy storage devices. However, the actual discharge energy density of the above system still has a large gap compared with the theoretical energy density. It can fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042B82Y40/00H01M4/1393
CPCY02E60/12Y02E60/13Y02E60/122Y02E60/10
Inventor 李春生孙嬿宋明阳王莉娜姚维学张志佳马雪刚
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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