Hollow TiO2@C composite microsphere and preparation method thereof

A titanium dioxide and carbon composite technology, used in the preparation of microspheres, microcapsule preparations, secondary batteries, etc., can solve the problems of ion channels that are not suitable for rapid sodium ion migration, capacity loss, poor conductivity, etc., to ensure structural stability. and fast kinetic properties, method simplicity, and the effect of short ion migration distances

Active Publication Date: 2020-12-08
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Hollow TiO2@C composite microsphere and preparation method thereof
  • Hollow TiO2@C composite microsphere and preparation method thereof
  • Hollow TiO2@C composite microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: Synthesis of silica nanospheres with uniform size

[0054] Add ethyl orthosilicate (0.04g / mL) to the mixture of water and ethanol (V:V, 2:15) containing ammonia (0.2mol / L), stir at 25°C for 4h, hydrolyze completely, and centrifuge. Wash with ethanol to obtain silica nanospheres with 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 20nm

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

[0058] The thickness of the titanium dioxide shell layer of the obtained silica@titania core-shell structure microspheres is 20 nm.

Embodiment 3

[0059] Embodiment 3: the shell layer thickness is the synthesis of 50nm silica@titanium dioxide core-shell structure microsphere

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

[0061] The thickness of the titanium dioxide shell layer of the obtained silica@titania core-shell structure microspheres is 50 nm.

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Abstract

The invention belongs to the technical field of advanced materials, and particularly relates to a hollow TiO2@C composite microsphere and a preparation method thereof. The preparation method comprisesthe following steps: dispersing silicon dioxide nanospheres in an organic solvent containing a surfactant and an alkali catalyst under the action of ultrasonic waves, adding a titanium source, and carrying out hydrolysis and polycondensation to obtain a SiO2@TiO2 core-shell structure compound; dispersing the compound into a strong alkali solution, and carrying out hydrothermal etching assisted crystallization to obtain titanate with a hollow structure; and finally, dispersing titanate into a carbon source aqueous solution, carrying out hydrothermal reaction, and roasting in an inert atmosphere to obtain the hollow TiO2@C composite microspheres constructed by the nanosheets. The composite microsphere has a double-shell hollow structure, and has large specific surface area, pore volume andpore diameter. The material is applied to a negative electrode of a sodium-ion battery, and shows excellent rate capability and pseudocapacitance characteristic. The raw materials are easy to obtain,the method is simple, and the product has wide application prospects in the fields of environment, energy, catalysis and the like.

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 rapid increase of population, the reduction of traditional energy sources and the increase of environmental pollution, the development and storage technology of clean energy has attracted extensive attention. In recent decades, rapid progress in lithium-ion battery technology has 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 is also rising along with the development cost of lithium. Therefore, lithium-ion batteries alone cannot meet the growing demands of energy storage applications. In order to alleviate these problems, researchers have focused their at...

Claims

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Application Information

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Patent Type & Authority Applications(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
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