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Preparation method of flexible sulfur/polyacrylonitrile/carbon nano-tube composite fibrous membrane and application

A technology of carbon nanotube composite and polyacrylonitrile, which is applied in the direction of active material electrodes, positive electrodes, electrical components, etc., can solve the problems of battery energy density reduction, unsuitability for industrial production, and cumbersome preparation process, etc., to improve energy density, Good application prospects and good repeatability

Inactive Publication Date: 2018-12-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the currently reported sulfur / polyacrylonitrile composites are used in electrodes, binders, conductive carbon black and metal current collectors need to be added to ensure the structural stability and conductivity of the electrodes, resulting in a series of shortcomings. First, the preparation process is cumbersome. , and more expensive raw materials are used, which increases the preparation cost and is not suitable for industrial production; the second is the introduction of inactive materials, which will lead to a decrease in the energy density of the battery

Method used

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  • Preparation method of flexible sulfur/polyacrylonitrile/carbon nano-tube composite fibrous membrane and application
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  • Preparation method of flexible sulfur/polyacrylonitrile/carbon nano-tube composite fibrous membrane and application

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Effect test

Embodiment 1

[0033] A preparation method of flexible sulfur / polyacrylonitrile / carbon nanotube composite fiber membrane:

[0034] (1) Add carbon nanotubes into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heat at a constant temperature at 70° C. and continue magnetic stirring for 1 hour to obtain a black suspension.

[0035] (2) Dilute the suspension obtained above with deionized water, then vacuum filter and wash with deionized water, and finally dry in a vacuum oven at 80° C. for 12 hours to obtain acidified carbon nanotubes.

[0036] (3) 120 mg of acidified carbon nanotubes were weighed and placed in 9 g of N,N-dimethylformamide solvent, ultrasonically dispersed for 45 min, then 1 g of polyacrylonitrile was added and magnetically stirred for 12 h to obtain a uniform and viscous dispersion.

[0037] (4) The obtained dispersion liquid was subjected to electrospinning, and the adjustment process parameters were: electrostatic field voltage 16kV, spinning spee...

Embodiment 2

[0044] A preparation method of flexible sulfur / polyacrylonitrile / carbon nanotube composite fiber membrane:

[0045] (1) Add carbon nanotubes into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heat at a constant temperature at 70° C. and continue magnetic stirring for 1 hour to obtain a black suspension.

[0046] (2) Dilute the suspension obtained above with deionized water, then vacuum filter and wash with deionized water, and finally dry in a vacuum oven at 80° C. for 12 hours to obtain acidified carbon nanotubes.

[0047] (3) Weigh 80 mg of acidified carbon nanotubes and place them in 9 g of N,N-dimethylformamide solvent, ultrasonically disperse for 45 min, then add 1 g of polyacrylonitrile and continue magnetic stirring for 12 h to obtain a uniform and viscous dispersion.

[0048] (4) The obtained dispersion liquid was subjected to electrospinning, and the adjustment process parameters were: electrostatic field voltage 16kV, spinning speed 0.1...

Embodiment 3

[0051] A preparation method of flexible sulfur / polyacrylonitrile / carbon nanotube composite fiber membrane:

[0052] (1) Add carbon nanotubes into a mixed solution of concentrated sulfuric acid and concentrated nitric acid, heat at a constant temperature at 70° C. and continue magnetic stirring for 1 hour to obtain a black suspension.

[0053] (2) Dilute the suspension obtained above with deionized water, then vacuum filter and wash with deionized water, and finally dry in a vacuum oven at 80° C. for 12 hours to obtain acidified carbon nanotubes.

[0054] (3) Weigh 40 mg of acidified carbon nanotubes and place them in 9 g of N,N-dimethylformamide solvent, ultrasonically disperse for 45 min, then add 1 g of polyacrylonitrile and continue magnetic stirring for 12 h to obtain a uniform and viscous dispersion.

[0055] (4) The obtained dispersion liquid was subjected to electrospinning, and the adjustment process parameters were: electrostatic field voltage 16kV, spinning speed 0.1...

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Abstract

The invention discloses a preparation method of a flexible sulfur / polyacrylonitrile / carbon nano-tube composite fibrous membrane and application of the flexible sulfur / polyacrylonitrile / carbon nano-tube composite fibrous membrane in a metal sulfur battery anode material. The preparation method comprises the step that a polyacrylonitrile / carbon nano-tube composite fibrous membrane prepared through electrostatic spinning and simple substance sulfur are heated and roasted. The preparation technology is simple, the synthesis condition is easy to control, and the method is suitable for industrial production; the obtained flexible self-supporting sulfur / polyacrylonitrile / carbon nano-tube composite fibrous membrane has the good flexibility, excellent rate capability and circulation stability, andlithium sulfur battery and sodium sulfur battery anode materials have the application prospect.

Description

technical field [0001] The invention relates to a method for preparing a flexible self-supporting sulfur / polyacrylonitrile / carbon nanotube (S-PAN-CNT) composite fiber membrane for positive electrode materials of lithium-sulfur batteries and sodium-sulfur batteries, and belongs to the technical field of energy storage materials. Background technique [0002] With the increasingly severe energy problems, rechargeable batteries (also known as secondary batteries) have developed rapidly as a high-efficiency energy storage device in the past half century. Among many secondary battery systems, lithium-sulfur batteries constructed of elemental sulfur positive electrodes and metal lithium negative electrodes have very obvious advantages. The theoretical specific capacity of elemental sulfur is as high as 1675mAh / g, and sulfur is cheap, abundant in reserves, and less harmful to the environment. Therefore, lithium-sulfur batteries have become the focus of research and development of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D04H1/43D04H1/413H01M4/36H01M4/38H01M4/62H01M10/052H01M10/39
CPCD04H1/413D04H1/43D04H1/728H01M4/362H01M4/38H01M4/625H01M10/052H01M10/3909H01M2004/021H01M2004/028Y02E60/10
Inventor 王丽娜王小飞刘天西
Owner DONGHUA UNIV
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