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A kind of tio2 microsphere material with hierarchical porous core-shell structure and its preparation method and application

A technology with core-shell structure and hierarchical porosity, which is applied in nanotechnology, structural parts, nanotechnology, etc. for materials and surface science. demand, the effect of improving lithium storage capacity and rate performance

Inactive Publication Date: 2018-10-23
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the conventional method of preparing titanium dioxide with uniform shape and size is to use structure-directing agents or templates, but this brings about cumbersome steps for subsequent template removal, and also increases energy consumption.

Method used

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  • A kind of tio2 microsphere material with hierarchical porous core-shell structure and its preparation method and application
  • A kind of tio2 microsphere material with hierarchical porous core-shell structure and its preparation method and application
  • A kind of tio2 microsphere material with hierarchical porous core-shell structure and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0035] TiO with Hierarchical Porous Core-Shell Structure 2 Microsphere material, prepared by the following method:

[0036] (1) Add 1.9mL oleylamine to 0.8mL water and 200mL absolute ethanol, stir to obtain a mixed solution, then add 4.4mL isobutyl titanate, and stir rapidly and uniformly for 1 hour to obtain a white suspension. Suction filtration after 12 hours, washing and drying to obtain a white precipitate;

[0037] (2) Add 0.2 g of the white precipitate obtained in step (1) into 20 mL of absolute ethanol, and stir evenly to obtain a mixed solution;

[0038] (3) Add 24g of sodium hydroxide to deionized water, mix and stir evenly to obtain an aqueous solution of sodium hydroxide;

[0039] (4) The aqueous sodium hydroxide solution obtained in step (3) is added to the mixed solution obtained in step (2), and after fully stirring for 1 h, it is placed in a polytetrafluoroethylene liner of 100 mL for hydrothermal reaction, and the reaction temperature is 150 °C, the reactio...

Embodiment 2

[0043] TiO with Hierarchical Porous Core-Shell Structure 2 Microsphere material, prepared by the following method:

[0044] (1) Add 2.0mL of oleylamine to 0.8mL of water and 400mL of absolute ethanol, stir to obtain a mixed solution, then add 4.4mL of isobutyl titanate, stir rapidly and uniformly for 2 hours, and obtain a white suspension. Suction filtration after 6h, washing and drying to obtain a white precipitate;

[0045] (2) Add 0.25 g of the white precipitate obtained in step (1) into 20 mL of absolute ethanol, and stir evenly to obtain a mixed solution;

[0046] (3) Add 20g of sodium hydroxide to deionized water, mix and stir evenly to obtain an aqueous solution of sodium hydroxide;

[0047] (4) The aqueous sodium hydroxide solution obtained in step (3) is added to the mixed solution obtained in step (2), and after fully stirring for 2 hours, it is placed in a 100mL polytetrafluoroethylene liner for hydrothermal reaction, and the reaction temperature is 160 °C, the r...

Embodiment 3

[0051] TiO with Hierarchical Porous Core-Shell Structure 2 Microsphere material, prepared by the following method:

[0052] (1) Add 1.8mL oleylamine to 0.8mL water and 200mL absolute ethanol, stir to obtain a mixed solution, then add 4.4mL isobutyl titanate, and stir rapidly and uniformly for 1 hour to obtain a white suspension. Suction filtration after 8 hours, washing and drying to obtain a white precipitate;

[0053] (2) Add 0.3 g of the white precipitate obtained in step (1) into 20 mL of absolute ethanol, and stir evenly to obtain a mixed solution;

[0054] (3) Add 25g of sodium hydroxide into deionized water, mix and stir evenly to obtain an aqueous solution of sodium hydroxide;

[0055] (4) Add the aqueous sodium hydroxide solution obtained in step (3) to the mixed solution obtained in step (2), stir it fully for 1h and then place it in a 100mL polytetrafluoroethylene liner for hydrothermal reaction. The reaction temperature is 140 °C, the reaction time is 24h; then ...

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Abstract

The present invention relates to a TiO2 microsphere material having a graded porous core-shell structure, a preparation method and applications thereof. The TiO2 microsphere material has a microsphere structure comprising a shell layer and an inner core, wherein the diameter of the microsphere is 500-600 nm, the shell layer is formed by stacking nano-sheets and particles and has a thickness of 20-25 nm, and the inner core is formed by stacking nanoparticles and has a radius of 180-200 nm. The method comprises: (1) in a water and dehydrated alcohol mixing solution, adding oleyl amine and isobutyl titanate, stirring, standing, carrying out suck filtering, and drying to obtain a white precipitate; and (2) adding the white precipitate into dehydrated alcohol, stirring, adding a sodium hydroxide aqueous solution, stirring, carrying out a hydrothermal reaction, and annealing to obtain the TiO2 microsphere material having the graded porous core-shell structure. According to the present invention, the method has characteristics of simple process and low reaction temperature requirement, and the prepared TiO2 microsphere material is used for preparing lithium ion batteries, and exhibits excellent electrochemical performance.

Description

technical field [0001] The present invention belongs to TiO 2 The field of nanomaterials, specifically related to TiO with hierarchical porous core-shell structure 2 Microsphere material and its preparation method and application. Background technique [0002] Because lithium-ion batteries have high volume-specific energy and mass-specific energy, are rechargeable and non-polluting, they have developed rapidly in a modern society where energy is scarce. At the same time, the growing telecommunications and information markets, especially the extensive use of mobile phones and notebook computers, have brought market opportunities for lithium-ion batteries. However, the existing commercial anode materials in lithium-ion batteries have poor safety performance and are prone to form lithium dendrites during charging and discharging, which may cause short circuits or even explosions. Therefore, the development of new safe and friendly anode materials is an important means to imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48B82Y30/00H01M10/0525
CPCB82Y30/00H01M4/48H01M10/0525H01M2004/021Y02E60/10
Inventor 王洪恩蔡祎尹凯利佘法爽张润霖苏宝连
Owner WUHAN UNIV OF TECH