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Nitrogen-doped carbon-coated flaky titanium oxide material as well as preparation method thereof and application thereof

A nitrogen-doped carbon and scale-like technology, which is applied in the direction of electrochemical generators, active material electrodes, electrical components, etc., can solve the problems of reversible specific capacity and rate performance attenuation, small ion diffusion rate, and low electronic conductivity. Achieve the effects of reducing grain boundary scattering, good capacitance and cycle stability, and increasing specific surface area

Inactive Publication Date: 2020-06-19
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, TiO 2 Belonging to semiconductor materials, the ion diffusion rate is small and the electronic conductivity is low, resulting in the attenuation of reversible specific capacity and rate performance. These problems hinder its practical application in lithium-ion batteries

Method used

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  • Nitrogen-doped carbon-coated flaky titanium oxide material as well as preparation method thereof and application thereof
  • Nitrogen-doped carbon-coated flaky titanium oxide material as well as preparation method thereof and application thereof
  • Nitrogen-doped carbon-coated flaky titanium oxide material as well as preparation method thereof and application thereof

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preparation example Construction

[0034] An embodiment of the present invention provides a method for preparing a nitrogen-doped carbon-coated scale-like titanium oxide material, comprising the following steps:

[0035] S1, stirring and mixing the titanium source and the solvent to obtain a mixed solution; wherein, the solvent is formed by mixing water, alcohols, ether and glycerin.

[0036] In a preferred embodiment, in this step, after the solvent is prepared according to a certain ratio, the titanium source is added for mixing under stirring conditions, and a uniformly mixed mixed solution is obtained after stirring for 0.5-1 hour. This step ensures that there is enough stirring time to allow the titanium source to be evenly distributed in the solvent, which is convenient for subsequent reactions.

[0037] Further, in a preferred embodiment, in this step, the molar ratio of the titanium source to ether is 1:5-20. Preferably, the molar ratio of titanium source to diethyl ether is 1:7-13. More preferably, t...

Embodiment 1

[0052] A nitrogen-doped carbon-coated scaly titanium oxide material provided in this example is prepared according to the following steps:

[0053] (1) Solvent preparation: mix ethanol, glycerin, ether, and water in a ratio of 30:15:15:1 to make 16ml of solvent;

[0054] (2) Preparation of mixed solution: under the condition of magnetic stirring, 0.65 g of titanyl sulfate hydrate was added to the solvent, and after stirring for 30 minutes, a uniformly mixed mixed solution was obtained;

[0055] (3) Preparation of precursor: Transfer the mixed solution to a stainless steel hydrothermal reaction kettle lined with polytetrafluoroethylene, and place it in an oven for solvothermal reaction. The reaction condition is 110°C, 28h; after the reaction is complete, cool to room temperature The obtained product was centrifuged, washed, and vacuum-dried at 80°C for 12 hours to obtain a precursor powder;

[0056] (4) Place the ground precursor powder in a quartz tube furnace, heat it to 50...

Embodiment 2

[0058] A nitrogen-doped carbon-coated scaly titanium oxide material provided in this example is prepared according to the following steps:

[0059] (1) Solvent preparation: mix ethanol, glycerin, ether, and water in a ratio of 30:15:15:1 to make 16ml of solvent;

[0060] (2) Preparation of mixed solution: under magnetic stirring conditions, add 0.45 g of titanyl sulfate hydrate to the solvent, and stir for 40 minutes to obtain a uniformly mixed mixed solution;

[0061] (3) Preparation of precursor: transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, place it in an oven for solvothermal reaction, and the reaction condition is 110°C for 36h; after the reaction is complete, cool to room temperature The obtained product was centrifuged, washed, and vacuum-dried at 80°C for 10 hours to obtain a precursor powder;

[0062] (4) Place the ground precursor powder in a quartz tube furnace, heat it to 500°C at a heating rate of 5°C...

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Abstract

The invention provides a nitrogen-doped carbon-coated flaky titanium oxide material as well as a preparation method thereof and application thereof, and relates to the technical field of lithium-ion battery materials. The preparation method comprises the following steps: stirring and mixing a titanium source and a solvent to obtain a mixed solution; wherein the solvent is formed by mixing water, alcohols, diethyl ether and glycerol; carrying out solvothermal reaction on the mixed solution, and then centrifuging, washing and drying to obtain a precursor; and calcining the ground precursor in anammonia atmosphere to obtain the nitrogen-doped carbon-coated scaly titanium oxide material. The preparation method is simple and easy to implement, the scale cluster structure of the prepared titanium oxide material increases the specific surface area of titanium oxide, the grain boundary scattering can be reduced due to the small grain size of TiO2, and the conductivity of the titanium oxide material is remarkably improved. Meanwhile, the doping of the nitrogen element introduces defects into the titanium oxide material such that the electronic conductivity of the titanium oxide material isincreased.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, and in particular to a nitrogen-doped carbon-coated scaly titanium oxide material and a preparation method and application thereof. Background technique [0002] With the development of human civilization, the depletion of traditional fossil energy and environmental pollution have become increasingly serious, and people's demand for clean energy (solar energy, wind energy, geothermal energy and tidal energy, etc.) has become increasingly urgent. Lithium-ion batteries have become an indispensable part of people's daily work and life. With many advantages such as high working voltage, large capacity, good cycle performance and excellent environmental tolerance, they are the most widely used. All portable electronic devices have their unshakable status. The electrochemical performance of lithium-ion batteries largely depends on the electrode materials, so the design and modifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCH01M4/483H01M4/624H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 孙婧婧邱嘉诚李泽阳
Owner XIAMEN UNIV OF TECH