Preparation method of transition metal oxide/carbon-based laminated composite material

A transition metal and composite material technology, which can be used in hybrid capacitor electrodes, electrical components, battery electrodes, etc. Adverse effects of chemical properties, reduction of specific surface area and electrical conductivity, etc., to achieve the effect of simple and controllable preparation method, improvement of insufficient electrical conductivity, and large particle size

Inactive Publication Date: 2015-06-24
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The multilayer graphene prepared by the chemical exfoliation method has a large number of defects and functional groups, resulting in a significant decrease in the specific surface area and electrical conductivity, and ultimately has an adverse effect on the electrochemical performance of metal oxide / graphene.
In addition, the lengthy preparation process and high cost also make the commercialization prospects of traditional methods to construct transition metal oxide / graphene layered composites unclear.

Method used

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  • Preparation method of transition metal oxide/carbon-based laminated composite material

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Experimental program
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Effect test

Embodiment 1

[0034] Weigh Nb with a particle size of 30 μm 2 CT x (T x Indicates that it contains functional groups, the same below) 100mg, put it into the quartz boat, and place the quartz boat in the center of the quartz tube, connect the pipeline to ensure no air leakage. Then open the inert gas cylinder, use high-purity argon to purge the closed quartz tube at a flow rate of 75 sccm for 45 minutes, then start heating, and raise the inner cavity temperature of the tube furnace to 850°C at a heating rate of 30°C / min, and keep it for 30 minutes. Then close the inert gas pressure reducing valve, open the oxidizing gas cylinder pressure reducing valve, and switch the intake of the tube furnace to compressed CO 2 , the flow rate is 75sccm, and the intake time is 30min. Then close the pressure reducing valve of the oxidizing gas cylinder, open the pressure reducing valve of the inert gas, the flow rate is 75 sccm, and turn off the heating button, and naturally cool the tube furnace to room...

Embodiment 2

[0038] Weigh Nb with a particle size of 30 μm 2 CT x 100mg, put it into a quartz boat, and place the quartz boat in the center of the quartz tube, connect the pipeline to ensure no air leakage. Then open the inert gas cylinder, use high-purity argon to purge the closed quartz tube at a flow rate of 75 sccm for 45 minutes, then start heating, and raise the inner cavity temperature of the tube furnace to 800°C at a heating rate of 30°C / min, and keep it for 30 minutes. Then close the inert gas pressure reducing valve, open the oxidizing gas cylinder pressure reducing valve, and switch the intake of the tube furnace to compressed CO 2 , the flow rate is 150sccm, and the intake time is 60min. Then close the pressure reducing valve of the oxidizing gas cylinder, open the pressure reducing valve of the inert gas, the flow rate is 75 sccm, and turn off the heating button, and naturally cool the tube furnace to room temperature under the protection of the inert atmosphere to obtain ...

Embodiment 3

[0041] Weigh Nb with a particle size of 30 μm 2 CT x100mg, put it into a quartz boat, and place the quartz boat in the center of the quartz tube, connect the pipeline to ensure no air leakage. Then open the inert gas cylinder, use high-purity argon to purge the closed quartz tube at a flow rate of 75 sccm for 45 minutes, then start heating, and raise the inner cavity temperature of the tube furnace to 850°C at a heating rate of 30°C / min, and keep it for 30 minutes. Then close the inert gas pressure reducing valve, open the oxidizing gas cylinder pressure reducing valve, and switch the intake of the tube furnace to compressed CO 2 , the flow rate is 150sccm, and the intake time is 60min. Then close the pressure reducing valve of the oxidizing gas cylinder, open the pressure reducing valve of the inert gas, the flow rate is 75 sccm, and turn off the heating button, and naturally cool the tube furnace to room temperature under the protection of the inert atmosphere to obtain th...

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Abstract

The invention relates to a preparation method of a transition metal oxide / carbon-based laminated composite material. According to the preparation method, a conducting material such as metal carbide, metal nitride or metal carbonitride with a two-dimensional laminated structure is taken as a precursor, a gas containing oxygen elements is taken as an oxidant, and the two-dimensional conducting material is converted into the transition metal oxide / carbon-based laminated composite material by in-situ oxidation under the condition of controlling the oxidation temperature at 300-1000 DEG C and controlling the oxidation time at 1-300 min. The method disclosed by the invention has the advantages of simplicity and easiness in operation, controllable structure and morphology, controllable crystal form and electrochemical properties of metal oxides, and the like; the preparation method is environment-friendly, and nuisanceless, has no by-product, can be used for reducing the economic costs of traditional preparation methods, and can be popularized; and the transition metal oxide / carbon-based laminated composite material not only can be used as a key electrode material of a new energy storage device, but also can be used as a denitration catalyst, so that the material can be applied to the fields of environmental remediation, and the like.

Description

technical field [0001] The invention relates to the field of carbon materials, in particular to a preparation method of a transition metal oxide / carbon-based layered composite material. Background technique [0002] Chemical power sources, such as rechargeable batteries (also known as secondary batteries) are devices that directly store electrical energy in the form of chemical energy. Because of convenience, quickness, high energy conversion rate and utilization rate, chemical power sources have developed rapidly in recent decades. The working mechanism of lithium-ion batteries is to perform reversible chemical reactions through the lithiation and delithiation of intercalation compounds by lithium ions. The stored chemical energy is large and the energy density is high. However, since the chemical reactions performed are limited by lithium ion diffusion and electron transport (the conductivity of intercalation compounds is generally low and electron transport is slow), the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01G11/32
CPCY02E60/10Y02E60/13
Inventor 乔文明张传芳吴秋芳马新胜王际童龙东辉凌立成
Owner EAST CHINA UNIV OF SCI & TECH
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