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A carbon nanofiber composite membrane embedded in tungsten carbide and its preparation and application

A carbon nanofiber and tungsten carbide technology, which is applied in the field of carbon nanofiber composite film and its preparation and application, can solve the problems affecting the cycle stability of electrochemical active energy storage and the active sites cannot be fully exposed, and achieve excellent electrical conductivity properties, electrochemical activity, inhibition of electrode material collapse, and high specific surface area

Inactive Publication Date: 2019-08-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its application in lithium-ion battery electrode materials has not yet been explored in depth, and pure tungsten carbide is easy to agglomerate, so that its active sites cannot be fully exposed, which seriously affects its electrochemical activity and cycle stability of energy storage.

Method used

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  • A carbon nanofiber composite membrane embedded in tungsten carbide and its preparation and application
  • A carbon nanofiber composite membrane embedded in tungsten carbide and its preparation and application
  • A carbon nanofiber composite membrane embedded in tungsten carbide and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Add 0.75g ammonium tetrathiotungstate and 0.5g polyacrylonitrile powder into 5mL N,N-dimethylformamide solvent, and keep stirring to obtain a uniform viscous dispersion;

[0039] (2) The obtained dispersion liquid is subjected to electrospinning, and the adjustment process parameters are: electrostatic field voltage 20kV, spinning speed 0.1mm min -1 , the receiving distance is 20cm, and ammonium tetrathiotungstate / polyacrylonitrile spinning membrane is obtained;

[0040] (3) Pre-oxidize the obtained spun film under air atmosphere, the pre-oxidation temperature is 250°C, and the heating rate is 2°C min -1 , the pre-oxidation constant temperature time is 2h, and the pre-oxidized ammonium tetrathiotungstate / polyacrylonitrile composite film is obtained;

[0041](4) The pre-oxidized ammonium tetrathiotungstate / polyacrylonitrile composite film was subjected to high-temperature carbonization in one step in an argon-hydrogen atmosphere. The heat treatment temperature was 7...

Embodiment 2

[0045] (1) Add 1g ammonium tetrathiotungstate and 0.5g polyacrylonitrile powder into 5mL N,N-dimethylformamide solvent, and keep stirring to obtain a uniform viscous dispersion;

[0046] (2) The obtained dispersion liquid is subjected to electrospinning, and the adjustment process parameters are: electrostatic field voltage 20kV, spinning speed 0.1mm min -1 , the receiving distance is 20cm, and ammonium tetrathiotungstate / polyacrylonitrile spinning membrane is obtained;

[0047] (3) Pre-oxidize the obtained spun film under air atmosphere, the pre-oxidation temperature is 250°C, and the heating rate is 2°C min -1 , the pre-oxidation constant temperature time is 2h, and the pre-oxidized ammonium tetrathiotungstate / polyacrylonitrile composite film is obtained;

[0048] (4) The pre-oxidized ammonium tetrathiotungstate / polyacrylonitrile composite film was subjected to high-temperature carbonization in one step in an argon-hydrogen atmosphere. The heat treatment temperature was 700...

Embodiment 3

[0050] (1) Add 0.75g ammonium tetrathiotungstate and 0.5g polyacrylonitrile powder into 5mL N,N-dimethylformamide solvent, and keep stirring to obtain a uniform viscous dispersion;

[0051] (2) The obtained dispersion liquid is subjected to electrospinning, and the adjustment process parameters are: electrostatic field voltage 20kV, spinning speed 0.1mm min -1 , the receiving distance is 20cm, and ammonium tetrathiotungstate / polyacrylonitrile spinning membrane is obtained;

[0052] (3) Pre-oxidize the obtained spun film under air atmosphere, the pre-oxidation temperature is 250°C, and the heating rate is 2°C min -1 , the pre-oxidation constant temperature time is 2h, and the pre-oxidized ammonium tetrathiotungstate / polyacrylonitrile composite film is obtained;

[0053] (4) The obtained pre-oxidized ammonium tetrathiotungstate / polyacrylonitrile composite film was subjected to high-temperature carbonization in one step in an argon-hydrogen atmosphere, the heat treatment tempera...

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Abstract

The invention relates to a tungsten carbide-embedded carbon nanofiber composite membrane and a preparation and an application thereof. The composite membrane is of a three-dimensional porous structure; an ammonium tetrathiotungstate / polyacrylonitrile nanofiber membrane is prepared through electrostatic spinning; and the tungsten carbide / carbon nanofiber composite membrane is prepared through one-step high-temperature carbonization reduction in an argon-hydrogen atmosphere. The tungsten carbide-embedded carbon nanofiber composite membrane is applied as an electrode material of a lithium-ion battery and a super capacitor. The prepared tungsten carbide / carbon nanofiber composite material has excellent conductivity and electrochemical activity.

Description

technical field [0001] The invention belongs to the field of composite nanomaterials and their preparation and application, in particular to a carbon nanofiber composite film embedded in tungsten carbide and its preparation and application. Background technique [0002] Carbon nanofibers have excellent properties such as high electrical conductivity, excellent mechanical properties, high specific surface area, light weight, low density, and good chemical stability. Carbon nanofibers are widely used in catalyst supports, polymer nanocomposites, flexible substrate materials for energy conversion and storage devices, and are widely used in aerospace, energy storage and other fields. Electrospinning is a simple and effective technology for preparing carbon nanofibers. The polymer solution is spun by high-voltage electrostatics, and then pre-oxidized and high-temperature carbonized to prepare carbon nanofibers with three-dimensional porous structure, high specific surface area an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525H01G11/24H01G11/30H01G11/36H01G11/86B82Y30/00
CPCB82Y30/00H01G11/24H01G11/30H01G11/36H01G11/86H01M4/364H01M4/583H01M4/628H01M10/0525Y02E60/10Y02E60/13
Inventor 刘天西施贻琴樊玮郜伟张龙生
Owner DONGHUA UNIV
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