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Hierarchical brookite titanium oxide/graphene composite material and preparation method and application thereof

A brookite-type, hierarchical structure technology, applied to structural parts, electrical components, battery electrodes, etc., can solve problems such as easy agglomeration, reduced capacity, and small nanoparticle size, so as to improve electrochemical performance, promote formation, The effect of reducing consumption

Inactive Publication Date: 2016-05-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these methods use urea solvent to prepare brookite TiO 2 , the amount of urea is large, and the morphology of the resulting product is also dominated by nanoparticles. Due to the small size of nanoparticles, agglomeration is prone to occur during the process of highly deintercalating lithium, resulting in a decrease in capacity.

Method used

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  • Hierarchical brookite titanium oxide/graphene composite material and preparation method and application thereof
  • Hierarchical brookite titanium oxide/graphene composite material and preparation method and application thereof
  • Hierarchical brookite titanium oxide/graphene composite material and preparation method and application thereof

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Embodiment 1

[0036] A preparation method of brookite type titanium oxide / graphene composite material with hierarchical structure, specifically comprising the following steps:

[0037] 1) Dissolve 0.8mL deionized water and 1.8mL oleylamine in 200mL absolute ethanol, stir for 20min and mix evenly to obtain the mixed solution I;

[0038] 2) Add 4.5mL of isobutyl titanate to the mixture I obtained in step 1), and stir thoroughly for 2 hours (stirring temperature is 25°C, stirring speed is 700r / min), forming a uniform milky white suspension, after standing get white precipitate;

[0039] 3) Add 20mL of deionized water and 10mL of graphene oxide into 20mL of absolute ethanol, mix well to obtain a mixed solution II, then weigh 0.25 g of the white precipitate obtained in step 2) and add it to the obtained mixed solution II, ultrasonically treat for 2 hours, and then add 20mL of ethylenediamine, continue ultrasonic treatment for 1h to obtain mixed solution III;

[0040] 4) Put the mixed liquid II...

Embodiment 2

[0043] A preparation method of brookite type titanium oxide / graphene composite material with hierarchical structure, specifically comprising the following steps:

[0044] 1) Dissolve 0.8mL deionized water and 1.8mL oleylamine in 200mL absolute ethanol, stir for 20min and mix evenly to obtain the mixed solution I;

[0045] 2) Add 4 mL of isobutyl titanate to the mixed solution I obtained in step 1), and stir thoroughly for 2 hours (stirring temperature is 10°C, stirring speed is 900r / min), forming a uniform milky white suspension, which is obtained after standing still white precipitate;

[0046] 3) Add 20mL of deionized water and 20mL of graphene oxide into 20mL of absolute ethanol, mix well to obtain the mixed solution II, then weigh 0.25g of the white precipitate obtained in step 2) and add it to the obtained mixed solution II, sonicate for 2h, and then add 20mL of ethylenediamine, continue ultrasonic treatment for 1h to obtain mixed solution III;

[0047]4) Put the mixed ...

Embodiment 3

[0051] A preparation method of brookite type titanium oxide / graphene composite material with hierarchical structure, specifically comprising the following steps:

[0052] 1) Dissolve 0.8mL deionized water and 1.8mL oleylamine in 200mL absolute ethanol, stir for 20min and mix evenly to obtain the mixed solution I;

[0053] 2) Add 4.5mL of isobutyl titanate to the mixed solution I obtained in step 1), and fully stir for 2 hours (stirring temperature is 60°C, stirring speed is 1200r / min), forming a uniform milky white suspension, which is obtained after standing still white precipitate;

[0054] 3) Add 20mL of deionized water and 40mL of graphene oxide into 20mL of absolute ethanol, mix well to obtain a mixed solution II, then weigh 0.25 g of the white precipitate obtained in step 2) and add it to the obtained mixed solution II, ultrasonicate for 3 hours, and then add 20mL of ethylenediamine, and continue ultrasonic treatment for 2h to obtain the mixed solution III;

[0055] 4)...

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Abstract

The invention discloses a preparation method of a hierarchical brookite titanium oxide / graphene composite material. The hierarchical brookite titanium oxide / graphene composite material is obtained by one-step preparation through a hydrothermal method and in shapes of microspheres with sizes being about 1-2 micrometers, and the microspheres are assembled by nanosheets. The preparation method includes: mixing tetraisobutyl orthotitanate and organic amine in water / ethanol solution, stirring, and subjecting obtained precipitates to hydrothermal reaction in water / ethanol alkaline solution of graphene to obtain a final product. The preparation method has the advantages that the hierarchical brookite titanium oxide / graphene composite material is prepared by the hydrothermal method, the problems of difficulty in synthesis of pure-phase brookite titanium oxide and poor electrochemical performance caused by low conductivity of the pure-phase brookite titanium oxide are solved; related raw materials are common, technical simplicity and feasibility and high yield are realized, and the hierarchical brookite titanium oxide / graphene composite material shows excellent electrochemical performance when being applied to cathodes of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials and electrochemical device materials, and in particular relates to a brookite-type titanium oxide / graphene composite material with a hierarchical structure and a preparation method and application thereof. Background technique [0002] With the development of society and the consumption of non-renewable energy such as petroleum and coal, energy and environmental problems have become increasingly prominent, and the development of new energy storage devices has attracted much attention. Lithium-ion batteries are widely used in various portable electronic devices due to their high energy density, good cycle performance, rechargeable and non-polluting. At present, the hybrid electric vehicle and electric vehicle industry are developing rapidly, and lithium-ion batteries are also widely used as high energy storage devices. [0003] At present, graphite is the main anode material for commer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62
CPCH01M4/485Y02E60/10
Inventor 王洪恩蔡恒辉蔡祎黄绍专苏宝连
Owner WUHAN UNIV OF TECH
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