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A hollow titanium dioxide@carbon composite microsphere and its preparation method

A titanium dioxide and carbon composite technology, which is applied in the preparation of microspheres, microcapsule preparations, secondary batteries, etc., can solve the problems of poor conductivity, ion channels that are not suitable for rapid sodium ion migration, and capacity loss. The method is simple, Guaranteed structural stability and fast kinetic properties, the effect of short ion migration distance

Active Publication Date: 2022-06-21
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductivity of titanium dioxide is poor, and the narrow ion channels are not suitable for fast sodium ion migration, resulting in serious capacity loss at high charge and discharge current densities.

Method used

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  • A hollow titanium dioxide@carbon composite microsphere and its preparation method
  • A hollow titanium dioxide@carbon composite microsphere and its preparation method
  • A hollow titanium dioxide@carbon composite microsphere and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: Synthesis of Silica Nanospheres of Uniform Size

[0054] Ethyl orthosilicate (0.04g / mL) was added to the mixture of water and ethanol (V:V, 2:15) containing ammonia water (0.2mol / L), stirred at 25°C for 4h, the hydrolysis was complete, centrifuged, Ethanol cleaning to obtain silica nanospheres of uniform size.

[0055] The particle size of the obtained silica nanospheres was 300 nm.

Embodiment 2

[0056] Example 2: Synthesis of silica@titania core-shell microspheres with a shell thickness of 20 nm

[0057] The silica nanospheres were dispersed in ethanol containing hexadecylamine (8 mg / mL) and ammonia water (4.5 mg / mL) under the action of ultrasound, then titanium isopropoxide (5 mg / mL) was added, and stirred at 25 °C After 1 h, hydrolysis and polycondensation were completed, centrifuged, and washed with ethanol to obtain silica@titania core-shell microspheres.

[0058] The thickness of the TiO2 shell layer of the obtained silica@TiO2 core-shell microspheres is 20 nm.

Embodiment 3

[0059] Example 3: Synthesis of silica@titania core-shell microspheres with a shell thickness of 50 nm

[0060] The silica nanospheres were dispersed in ethanol containing hexadecylamine (8 mg / mL) and ammonia water (4.5 mg / mL) under the action of ultrasound, and then titanium isopropoxide (12 mg / mL) was added, and stirred at 25 °C After 1 h, hydrolysis and polycondensation were completed, centrifuged, and washed with ethanol to obtain silica@titania core-shell microspheres.

[0061] The thickness of the TiO2 shell layer of the obtained silica@TiO2 core-shell microspheres is 50 nm.

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Abstract

The invention belongs to the technical field of advanced materials, and specifically relates to a hollow titanium dioxide@carbon composite microsphere and a preparation method thereof. In the present invention, the silica nanospheres are first dispersed in an organic solvent containing a surfactant and an alkali catalyst under the action of ultrasound, and then a titanium source is added to obtain a silica@titanium dioxide core-shell structure compound through hydrolysis and polycondensation; Then disperse the complex into a strong alkali solution and assisted crystallization by hydrothermal etching to obtain a hollow structure titanate; finally, disperse the titanate into a carbon source aqueous solution, and roast it in an inert atmosphere after hydrothermal reaction to obtain Hollow TiO2@Carbon Composite Microspheres Constructed by Nanosheets. The composite microsphere has a double-shell hollow structure, and has large specific surface area, pore volume and pore diameter. The material is applied to the anode of sodium-ion batteries and exhibits excellent rate performance and pseudocapacitive properties. The raw material of the invention is easy to obtain, the method is simple, and has wide application prospects in many fields such as environment, energy, and catalysis.

Description

technical field [0001] The invention belongs to the technical field of advanced materials, and in particular relates to a hollow titanium dioxide@carbon composite microsphere and a preparation method thereof. Background technique [0002] Due to the dramatic increase in population, the reduction of traditional energy sources, and the aggravation of environmental pollution, the development and storage technologies of clean energy have received extensive attention. In recent decades, rapid advances in lithium-ion battery technology have improved human living standards. Lithium-ion batteries are used in most mobile electronic devices, e-bikes and electric vehicles. However, the reserves of lithium sources are limited, and the cost of lithium-ion batteries has also risen with the development cost of lithium. Therefore, lithium-ion batteries alone cannot meet the growing demand for energy storage applications. To alleviate these problems, researchers have focused on the resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02B01J13/22H01M10/054
CPCB01J13/02B01J13/22H01M10/054Y02E60/10
Inventor 李伟梁海琛王金秀赵东元
Owner FUDAN UNIV