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a kind of na 2 ti 3 o 7 -c preparation method of nanofiber

A na2ti3o7-c, nanofiber technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor conductivity and low energy density, and achieve easy operation, large specific surface area, Simple preparation process

Active Publication Date: 2021-01-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For Na 2 Ti 3 o 7 The problems of poor conductivity and low energy density, the invention provides a Na 2 Ti 3 o 7 - Preparation method of C nanofibers

Method used

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  • a kind of na <sub>2</sub> ti <sub>3</sub> o <sub>7</sub> -c preparation method of nanofiber
  • a kind of na <sub>2</sub> ti <sub>3</sub> o <sub>7</sub> -c preparation method of nanofiber
  • a kind of na <sub>2</sub> ti <sub>3</sub> o <sub>7</sub> -c preparation method of nanofiber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) TiO obtained by electrospinning 2 / C nanofiber precursors were first pre-fired in a muffle furnace at 200 °C for 2 h, and then in a tube furnace in an argon / hydrogen atmosphere (H 2 The volume fraction is 5%) and calcined at 800°C for 3h to obtain rutile TiO 2 / C nanofibers.

[0031] (2) the rutile TiO obtained in step (1) 2 / C nanofiber 0.1g is placed in a 70ml autoclave.

[0032] (3) Add 10 ml of 1.5 mol / L sodium hydroxide solution into the above autoclave, and conduct a hydrothermal reaction at 140° C. for 6 h.

[0033] (4) Remove the sheets obtained in step (3) from the autoclave, filter and wash them with deionized water and absolute ethanol for 3 to 5 times, and dry them in a vacuum oven.

[0034] (5) Place the nanofiber precursor obtained in step (4) in a tube furnace, and calcine it at 600 °C for 4 h under an argon atmosphere, with a heating rate of 4 °C / min. The product obtained is not Na 2 Ti 3 o 7 -C nanofibers having a nodule-like structure.

Embodiment 2

[0036] (1) TiO obtained by electrospinning 2 / C nanofiber precursors were first pre-fired in a muffle furnace at 200 °C for 2 h, and then in a tube furnace in an argon / hydrogen atmosphere (H 2 The volume fraction is 5%) and calcined at 550°C for 4h.

[0037] (2) the anatase TiO obtained in step (1) 2 / C nanofiber 0.1g is placed in a 70ml autoclave.

[0038] (3) Add 20ml of 4mol / L sodium hydroxide solution into the above-mentioned autoclave, and conduct a hydrothermal reaction at 160° C. for 8 hours.

[0039](4) The flake obtained in step (3) is removed from the autoclave, washed with deionized water and absolute ethanol for 3 to 5 times, respectively, and dried in a vacuum oven to obtain Na 2 Ti 3 o 7 -C nanofiber precursor.

[0040] (5) Na obtained from step (4) 2 Ti 3 o 7 -C nanofiber precursors were placed in a tube furnace and calcined at 600 °C for 4 h under an argon atmosphere with a heating rate of 4 °C / min to obtain Na 2 Ti 3 o 7 -C nanofibers with a scaly ...

Embodiment 3

[0042] (1) TiO obtained by electrospinning 2 / C nanofiber precursors were first pre-fired in a muffle furnace at 200 °C for 2 h, and then in a tube furnace in an argon / hydrogen atmosphere (H 2 The volume fraction is 5%) and calcined at 700°C for 3h to obtain anatase TiO 2 / C nanofibers.

[0043] (2) the anatase TiO obtained in step (1) 2 / C Nanofiber 0.2g is placed in a 70ml autoclave.

[0044] (3) Add 10ml of 1.5mol / L sodium hydroxide solution into the above-mentioned autoclave, and conduct a hydrothermal reaction at 140°C for 6h.

[0045] (4) the flakes obtained in step (3) are removed from the autoclave, washed with deionized water and dehydrated alcohol for 3 times, respectively, and placed in a vacuum drying oven to dry to obtain Na 2 Ti 3 o 7 -C nanofiber precursor.

[0046] (5) Na obtained from step (4) 2 Ti 3 o 7 -C nanofiber precursors were placed in a tube furnace and calcined at 600 °C for 4 h under an argon atmosphere with a heating rate of 4 °C / min to ob...

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Abstract

The invention relates to a preparation method of a Na2Ti3O7-C nanometer fiber. The preparation method comprises the steps of firstly, pre-sintering a TiO2 / C nanometer fiber precursor, obtained by electrostatic spinning, in a muffle furnace for 1-2 hours at 100-200 DEG C by hydrothermal reaction; secondly, performing calcination in a tubular furnace under argon / hydrogen atmosphere for 3-6 hours at550-700 DEG C to obtain an anatase type TiO2 / C nanometer fiber; thirdly, adding a sodium hydroxide solution, and performing hydrothermal reaction in a high-pressure reaction kettle to obtain a Na2Ti3O7-C nanometer fiber precursor; and fourthly, performing calcination in the tubular furnace under argon atmosphere to obtain a black Na2Ti3O7-C nanometer fiber. The Na2Ti3O7-C nanometer fiber preparedby the method is uniform in diameter, the diameter is about 150-200 nanometers, and the Na2Ti3O7-C nanometer fiber has excellent electrochemical performance when used as a sodium ion battery negativeelectrode material. The method has the advantages of moderate condition, simple process, relatively short preparation period and the like, and is simple to operate.

Description

technical field [0001] The invention relates to the technical field of preparation of chemical power materials, in particular to a Na 2 Ti 3 o 7 -The preparation method of C nanofiber can be used as the negative electrode material of sodium ion battery. Background technique [0002] In the history of the development of human society, energy has always been the driving force for its advancement. With the rapid development of industry in today's society, it has also led to a gradual increase in society's dependence on energy. As traditional fossil energy sources such as coal, oil, and natural gas are gradually exhausted, and a large amount of harmful substances unfavorable to the environment will be produced during use, which seriously threatens human health and life safety, so the development of new energy sources is imminent. Among many existing energy storage devices, lithium-ion batteries have a series of advantages such as high voltage, high capacity, long cycle life,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/583H01M10/054B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/583H01M10/054Y02E60/10
Inventor 刘黎聂苏李敏刘珺芳王先友
Owner XIANGTAN UNIV