Magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material prepared by carbonization & magnetization & vapor deposition

A nanofiber, carbon nanotube technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem that the uniformity of physical doping cannot be guaranteed, the specific surface area and activity cannot be provided, and the operation is difficult. And other issues

Inactive Publication Date: 2018-05-18
TIANJIN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, part of the carbon nanotubes in the composite carbon material obtained by the doping of the former spinning solution is distributed inside the porous carbon nanofiber matrix, which cannot provide specific surface area and activity; while the physical doping uniformity of the latter cannot be guaranteed.
Kong et al. (Yuxia Kong, Tingting Qiu, Jun Qiu. Fabrication of novel micro-nano carbonous composites based on self-made hollow activated carbon fibers[J]. Applied Surface Science 265(2013) 352-357) used chemical vapor deposition to Carbon nanotubes are grown on a porous carbon fiber matrix, but the por...

Method used

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  • Magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material prepared by carbonization & magnetization & vapor deposition
  • Magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material prepared by carbonization & magnetization & vapor deposition
  • Magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material prepared by carbonization & magnetization & vapor deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 1 g of polyvinyl alcohol into 9 mL of distilled water, and keep stirring to make it fully swell, then put it into a constant temperature oil bath at 90°C, and stir while heating to obtain a polyvinyl alcohol solution. Dissolve 0.4g of boric acid in 10g of water at room temperature. Take 30 μL of boric acid with a micro-syringe and add it to 10 g of tetrafluoroethylene aqueous emulsion, mix evenly, and then blend with polyvinyl alcohol solution reduced to room temperature to prepare a solution with a mass ratio of polyvinyl alcohol polyvinyl alcohol to tetrafluoroethylene of 1:6, and finally Add 3g of ferric chloride and continue stirring for 12h to obtain spinning solution 1.

[0027]The above-mentioned spinning solution is added to the spinning device, and the spinning process parameters are: air flow rate 0.1MPa, spinning voltage 40kV, receiving distance 50cm, extrusion rate 20mL / h, spinning for a certain period of time to obtain ferric chloride / polyethylene Alco...

Embodiment 2

[0031] Add 0.8 g of polyvinyl alcohol into 9.2 mL of distilled water, and keep stirring to make it fully swell, then put it into a constant temperature oil bath at 90°C, and stir while heating to obtain a polyvinyl alcohol solution. Dissolve 0.3g of boric acid in 10g of water at room temperature. Take 45 μL of boric acid with a micro-syringe and add it to 12 g of tetrafluoroethylene aqueous emulsion, mix evenly, and then blend with polyvinyl alcohol solution restored to room temperature to prepare a solution with a mass ratio of polyvinyl alcohol to polytetrafluoroethylene of 1:9, and finally Add 2g of pressed ferric chloride and continue to stir for 9h to obtain a spinning solution.

[0032] The above spinning solution is added to the spinning device, and the spinning process parameters are: air flow rate 0.06MPa, spinning voltage 25kV, receiving distance 50cm, extrusion rate 40mL / h, spinning for a certain period of time to obtain ferrous chloride / polyethylene Vinyl alcohol / ...

Embodiment 3

[0036] Add 1.2 g of polyvinyl alcohol into 8.8 mL of distilled water, and keep stirring to make it fully swell, then put it into a constant temperature oil bath at 90°C, and stir while heating to obtain a polyvinyl alcohol solution. Dissolve 0.5g of boric acid in 10g of water at room temperature. Take 15 μL of boric acid with a micro-syringe and add it to 24 g of tetrafluoroethylene aqueous emulsion, mix evenly, and then blend with polyvinyl alcohol solution reduced to room temperature to prepare a spinning solution with a mass ratio of polyvinyl alcohol polyvinyl alcohol to tetrafluoroethylene of 1:3. .

[0037] Add the above spinning solution into the spinning device, the spinning process parameters are: air flow rate 0.14MPa, spinning voltage 45kV, receiving distance 50cm, extrusion rate 30mL / h, spinning for a certain period of time to obtain ferric nitrate / polyvinyl alcohol / PTFE / boric acid composite microfiber.

[0038] The obtained composite microfibers were subject...

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Abstract

The invention relates to a magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material prepared by high-temperature carbonization & magnetization & vapor deposition for a lithium-sulfur battery positive electrode material. The method comprises the following steps of uniformly mixing aqueous emulsion containing polyvinyl alcohol and polytetrafluoroethylene and a small amountof boric acid, adding a certain mass of iron salt or ferrite to prepare a spinning solution, spinning to form a fiber under a joint effect of a high-voltage electrostatic field and high-speed air flow, performing low-temperature pre-processing under an air atmosphere, and further performing high-temperature carbonization & magnetization & chemical vapor deposition to obtain the magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material. The magnetic cellular porous carbon nanometer fiber@carbon nanotube composite material prepared by the method is large in specific area, good in magnetism and high in bonding capability of materials, carbonization and growth (chemical vapor deposition) of a carbon nanotube are simultaneously achieved during the carbonization process,the preparation method is simple and practical and is good in controllability, and mass production can be achieved.

Description

technical field [0001] The present invention relates to a one-step high-temperature carbonization & magnetization & chemical vapor deposition method to prepare magnetic honeycomb porous carbon nanofiber@carbon nanotube composite material for lithium-sulfur battery positive electrode materials, especially to provide a kind of composite material with through holes and controllable pore size structure. On the carbon nanofiber matrix, carbon nanotubes are uniformly grown and loaded with ferrous fluoride and iron, with large specific surface area, strong bonding ability between materials, good magnetism, good conductivity, simple and easy to implement, environment-friendly, A method for preparing a mass-producible magnetic honeycomb porous carbon nanofiber@carbon nanotube composite material. Among them, the rich through-hole structure of the honeycomb carbon nanofiber matrix can effectively increase the sulfur storage, and the uniform growth of carbon nanotubes and uniform distribu...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 程博闻鞠敬鸽康卫民刘雍闫静邓南平庄旭品赵义侠李磊王利媛
Owner TIANJIN POLYTECHNIC UNIV
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