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Porous carbon nanofiber membrane for positive electrode material of lithium-sulfur battery and preparation method thereof

A nanofiber membrane, cathode material technology, applied in battery electrodes, lithium storage batteries, nanotechnology for materials and surface science, etc., can solve the problem of poor production stability, low cost, and low electrospinning production efficiency of solution jet technology. question

Inactive Publication Date: 2015-12-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method capable of continuously preparing porous carbon nanofiber membranes for lithium-sulfur battery positive electrode materials, using water-soluble polyvinyl alcohol as a carbon source, low cost, high carbon yield, and no pollution to the environment; Polytetrafluoroethylene is used as a pore-forming agent, and it is evenly blended with polyvinyl alcohol solution. During the spinning process, the polyvinyl alcohol fiber is refined, and it decomposes after carbonization, forming uniform through holes on the carbon fiber matrix; at the same time, it solves the problem of electrospinning. In order to solve the problems of low production efficiency and poor production stability of solution injection technology, the two technologies are combined, and the electrostatic solution blowing process is used to make the polymer solution be drawn under the dual forces of high-speed air flow and electrostatic field to prepare polyvinyl alcohol / polymer The method of tetrafluoroethylene / boric acid superfine fiber, and then through low-temperature pre-oxidation, high-temperature carbonization process, to prepare porous carbon nanofiber membrane

Method used

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  • Porous carbon nanofiber membrane for positive electrode material of lithium-sulfur battery and preparation method thereof
  • Porous carbon nanofiber membrane for positive electrode material of lithium-sulfur battery and preparation method thereof
  • Porous carbon nanofiber membrane for positive electrode material of lithium-sulfur battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 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 25 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 1:15. .

[0029] The above spinning solution is added to such as figure 1 In the spinning device, the device includes: 1 metering injection pump, 2 liquid storage tank, 3 spinneret, 4 high voltage power supply, 5 air storage tank, 6 pressure regulating valve, 7 spinning tunnel, 8 air compressor, 9 receiving Net curtain composition. Spinning process parameters are set as follows: air f...

Embodiment 2

[0033] 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 15 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 spinning solution with a mass ratio of polyvinyl alcohol polyvinyl alcohol to tetrafluoroethylene of 1:9. .

[0034] Add the above spinning solution into the spinning device, 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 polyvinyl alcohol / polyethylene tetrachloride Vinyl fluoride / boric acid composite microfiber.

[0035] The obtained composite micro...

Embodiment 3

[0038] 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 45 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 restored to room temperature to prepare a spinning solution with a mass ratio of polyvinyl alcohol polyvinyl alcohol to tetrafluoroethylene of 1:12. .

[0039] 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 polyvinyl alcohol / polyethylene tetrachloride Vinyl fluoride / boric acid composite microfiber.

[0040] The obtained composite micr...

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Abstract

The invention relates to a porous carbon nanofiber membrane for positive electrode material of a lithium-sulfur battery and a preparation method thereof. The porous carbon nanofiber membrane is characterized in that the diameters of the fibers range from 150nm to 500nm, the corpus fibrosums contain continuous through holes with the hole diameters being 30-100nm, and the porosities of the corpus fibrosums are more than 70%. The preparation method comprises three steps of preparation of precursor preparation, low-temperature pretreatment and high-temperature carbonization treatment. The porous carbon nanofiber membrane is provided with the continuous through holes, has super-large specific surface areas, is filled with elemental sulfur to be applied to the lithium-sulfur battery, and has relatively high cycle performance and long service life. In addition, the porous carbon nanofiber membrane can be widely applied to the fields of super capacitors, adsorption and the like.

Description

technical field [0001] The invention relates to a porous carbon nanofiber membrane for lithium-sulfur battery positive electrode materials and a preparation method thereof, in particular to provide a lithium-sulfur membrane with through holes, controllable pore size structure, simple operation, environmental friendliness, and mass production The invention discloses a method for preparing a porous carbon nanofiber membrane for battery cathode materials. technical background [0002] The current rapid development of technologies such as portable electronic devices and new energy vehicles has put forward higher and higher requirements for batteries. Lithium-sulfur batteries have become a current international research hotspot due to their outstanding high specific energy, cheap raw materials, and environmental friendliness. [0003] However, there are some problems in the charging and discharging process of lithium-sulfur batteries, such as the poor ion and electronic conducti...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/583H01M10/054Y02E60/10
Inventor 程博闻鞠敬鸽李磊康卫民李甫马晓敏厉宗洁胡敏庄旭品赵义侠
Owner TIANJIN POLYTECHNIC UNIV
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