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Three-dimensional-structure TiO2/graphene aerogel compound as well as preparation method and application thereof

A technology of graphene airgel and graphene hydrogel, which is applied in the direction of structural parts, electrical components, electrochemical generators, etc., can solve problems such as unfavorable electron transmission, poor electrical conductivity, and affecting the electrochemical performance of materials, achieving Huge application prospects, the effect of improving electrochemical performance

Inactive Publication Date: 2017-06-13
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a semiconductor material, titanium dioxide has very poor electrical conductivity, which is very unfavorable for electron transport and thus affects the electrochemical performance of the material. This fatal shortcoming limits its application as an electrode material.

Method used

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  • Three-dimensional-structure TiO2/graphene aerogel compound as well as preparation method and application thereof
  • Three-dimensional-structure TiO2/graphene aerogel compound as well as preparation method and application thereof
  • Three-dimensional-structure TiO2/graphene aerogel compound as well as preparation method and application thereof

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Experimental program
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preparation example Construction

[0023] In order to effectively improve TiO 2 The disadvantage of poor electrical conductivity can promote electron transport to improve the electrochemical performance of the material. This embodiment provides a three-dimensional structure TiO 2 The preparation method of / graphene airgel composite comprises the steps:

[0024] 1) At room temperature, 0.24g-0.28g of TiOSO 4 Dissolve in 20mL, 2mg / ml graphene oxide solution, add 0.01g-0.02g ascorbic acid to the solution, under dry conditions, fully stir and mix for 1h to obtain a brownish yellow reaction solution;

[0025] 2) Transfer the brown-yellow reaction solution to a reaction kettle, and conduct a hydrothermal synthesis reaction at 170-180°C for 12 hours to obtain a three-dimensional structure TiO 2 / graphene hydrogel;

[0026] 3) The three-dimensional structure TiO obtained above 2 / The graphene hydrogel was fully rinsed with deionized water, and dried in vacuum at 70-80°C for 6-8 hours to obtain the target product w...

Embodiment 1

[0029] Embodiment 1 A kind of three-dimensional structure TiO 2 / Graphene airgel composite

[0030] Follow the steps below to prepare:

[0031] 1) At room temperature, 0.24g of TiOSO 4 Dissolve in 20mL graphene oxide solution with a concentration of 2mg / ml, then add 0.01g-0.02g ascorbic acid to the dissolved solution, under dry conditions, fully stir and mix for 1 hour to obtain a brownish yellow reaction solution;

[0032] 2) Transfer the brown-yellow reaction solution to the reaction kettle, react at 170-180°C for 12h, and obtain the three-dimensional structure TiO 2 / graphene hydrogel;

[0033] 3) The three-dimensional structure of TiO 2 / The graphene hydrogel was fully rinsed with deionized water, and dried in vacuum at 70-80°C for 6-8 hours to obtain the target product with a three-dimensional structure TiO 2 / graphene airgel composite.

Embodiment 2

[0034] Embodiment 2 A kind of three-dimensional structure TiO 2 / Graphene airgel composite

[0035] Follow the steps below to prepare:

[0036] 1) At room temperature, 0.28g of TiOSO 4 Dissolve in 20mL graphene oxide solution with a concentration of 2mg / ml, then add 0.01g-0.02g ascorbic acid to the dissolved solution, under dry conditions, fully stir and mix for 1 hour to obtain a brownish yellow reaction solution;

[0037] 2) Transfer the brown-yellow reaction solution to the reaction kettle, react at 170-180°C for 12h, and obtain the three-dimensional structure TiO 2 / graphene hydrogel;

[0038] 3) The three-dimensional structure of TiO 2 / The graphene hydrogel was fully rinsed with deionized water, and dried in vacuum at 70-80°C for 6-8 hours to obtain the target product with a three-dimensional structure TiO 2 / graphene airgel composite.

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Abstract

The invention provides a three-dimensional-structure TiO2 / graphene aerogel compound as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving TiOSO4 into a graphene oxide solution at a room temperature, adding ascorbic acid into the solution, and adequately stirring and mixing under a drying condition, so as to obtain a brownish yellow reaction solution; (2) transferring the brownish yellow reaction solution into a reaction kettle; carrying out hydro-thermal synthesis reaction, so as to obtain three-dimensional-structure TiO2 / graphene aerogel; (3) adequately flushing the three-dimensional-structure TiO2 / graphene aerogel with deionized water, and carrying out vacuum drying at 70-80 DEG C for 6-8 hours, so as to obtain a target product, namely the three-dimensional-structure TiO2 / graphene aerogel compound. In the premise that the compound preserves the excellent property of an electrode material, the specific surface area of the material is further increased by virtue of a hierarchical porous structure of the compound, so that the problem of low conductivity of TiO2 is solved, and meanwhile, the electrochemical performance of the material is improved.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a three-dimensional structure TiO 2 / Graphene airgel composite and its preparation method and application. Background technique [0002] Titanium dioxide is widely used in real life, from our common toothpaste to decorative paints, all of which contain titanium dioxide. At present, people have expanded its use, so that titanium dioxide can be used in energy and environmental fields including lithium batteries, fuel cells, photolysis of water to produce hydrogen, and degradation of organic matter. Titanium dioxide has many advantages in the application of lithium-ion battery anode materials: long cycle life, low cost, and environmental friendliness. In addition, the working voltage of titanium dioxide is higher than that of traditional graphite anode materials (~1.6 V vs. Li / Li + ), so that the solid electrolyte surface film (SEI) will not be produced during the electrochemica...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/364H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 宋溪明聂胜楠王登虎崔潞霞葛昊
Owner LIAONING UNIVERSITY
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