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Titanium dioxide/graphene nanocomposite material and preparation method and application thereof

A nanocomposite material, titanium dioxide technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of low initial efficiency, low volume energy density, etc., and achieve the effect of large specific surface area, high photocatalytic activity, and good permeability

Inactive Publication Date: 2012-07-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low initial efficiency (<60%) and low volume energy density, it is the main factor that limits this material directly as the negative electrode material of lithium-ion batteries.

Method used

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  • Titanium dioxide/graphene nanocomposite material and preparation method and application thereof
  • Titanium dioxide/graphene nanocomposite material and preparation method and application thereof
  • Titanium dioxide/graphene nanocomposite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 5ml concentrated sulfuric acid (98wt%) was added to 100ml of the graphene aqueous solution with a concentration of 0.5g / L, stirred evenly, 5g of titanium sulfate powder was weighed and added to the above solution and stirred for 30 minutes, the solution was put into a sealed bottle, The reaction was carried out at 100°C for 6 hours. The obtained black precipitate was washed three times with water and dried at 80°C to obtain the titanium dioxide and graphene composite material. [TiO] produced by the hydrolysis of the titanium source during this process 2+ The groups enter into the graphene layers through electrostatic attraction and diffusion, and under certain conditions, heterogeneous nucleation grows. Graphene acts as a structure inducer and does not require any template to prepare anatase-phase mesoporous titania nanospheres and graphite. Graphene composite nanocomposite material, mesoporous titanium dioxide spheres with a size of 100nm are evenly distributed on gra...

Embodiment 2

[0044] The difference from Example 1 is that 5ml of concentrated sulfuric acid (98wt%) was added to 100ml of the graphene aqueous solution with a concentration of 0.3g / L, stirred evenly, and 3.5g of titanium sulfate powder was weighed and added to the above solution and stirred for 30 minutes. , the solution was put into a sealed bottle and reacted at 80°C for 2 hours. Then the obtained black precipitate was centrifuged, washed three times with deionized water, and vacuum-dried at 80° C. to obtain a nanocomposite material of anatase-phase titanium dioxide nanometers and graphene. The particles are uniformly dispersed on the graphene surface, the pore size distribution is 2-50nm, and the specific surface area is 110m 2 / g.

[0045] In the titanium dioxide / graphene nanocomposite material in this embodiment, the proportion of graphene is 14 wt %, and the rest is titanium dioxide.

Embodiment 3

[0047] The difference from Example 1 is that 4.6ml of hydrochloric acid (37wt%) was added to 100ml of the graphene aqueous solution with a concentration of 0.3g / L, the resulting solution was ultrasonically dispersed for 2 hours by stirring for 10 minutes, and a tetrabutyl titanate solution was added. It was added dropwise to the prepared solution and stirred for half an hour, and then the resulting solution was placed in a sealed bottle to react at 80° C. for 12 hours. Then the obtained black precipitate was centrifuged, washed three times with deionized water, and vacuum-dried at 80°C to obtain a nanocomposite material composed of mesoporous titania nanospheres in anatase phase and graphene. The particle size of the composite material is Titanium dioxide particles of 200-300nm are uniformly dispersed on the surface of graphene, the pore size distribution is 5-100nm, and the specific surface area is 69m 2 / g.

[0048] In the titanium dioxide / graphene nanocomposite material of...

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Abstract

The invention relates to a titanium dioxide / graphene nanocomposite material, a preparation method of the nanocomposite material and application of the nanocomposite material in the field of energy source and cleaning environment. The graphene accounts for 1-25wt% and the balance is titanium dioxide. Morphology of the titanium dioxide is a mesoporous structure or a structure with a dominant high energy surface, and titanium dioxide is scattered uniformly on the surface of graphene. According to the invention, by adopting a titanium source and graphene as initial materials, and water or organic solvents as reaction solvents, the nanocomposite material with titanium dioxide with the mesoporous structure or a titanium dioxide nano sheet with the dominant high energy surface compounded with graphene can be obtained through hydrothermal synthesis or a hydrolysis reaction. The invention can be carried out in an aqueous solution system and the crystallinity of the product is high. The composite material can be applied to a cathode material of a power ion battery, has a higher charge-discharge capacity, is excellent in high current charge and discharge, stable in circulating performance, has very good photocatalytic performance and can be used to light degradation of organic pollutants and water photolysis for preparing hydrogen.

Description

technical field [0001] The invention relates to a titanium dioxide / graphene composite material and a preparation method thereof and application in the fields of energy and clean environment, in particular to the application of the composite material in the fields of power lithium ion batteries and photocatalysis. Background technique [0002] Environmental pollution and energy crisis have aroused widespread concern around the world. At present, automobiles consume about 45% of crude oil production and release a large amount of the greenhouse gas carbon dioxide; automobile exhaust also contains other polluting gases such as sulfur dioxide and nitrogen oxides. The development of non-emission and low-pollution electric vehicles has become an urgent task recognized by all countries in the world. Many automobile manufacturers, battery manufacturers, chemical reagent companies and government departments in various countries have invested a lot of money and manpower to accelerate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 成会明李娜李峰刘岗甄超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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