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Carbon fiber/carbon nanotube composite membrane as well as preparation method and application thereof

A carbon nanotube composite and carbon nanotube technology, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of limited application and complicated preparation methods, so as to simplify the preparation process, improve the uniformity of dispersion, Ease of large-scale industrial production

Inactive Publication Date: 2015-09-02
INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these materials currently have complex preparation methods and limited applications.

Method used

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  • Carbon fiber/carbon nanotube composite membrane as well as preparation method and application thereof
  • Carbon fiber/carbon nanotube composite membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Add polyacrylonitrile with a molecular weight of 150,000Da to the organic solvent N,N-dimethylformamide, heat to a temperature of 60°C and stir under magnetic stirring until the polyacrylonitrile is completely dissolved to obtain a 10% mass fraction of polyacrylonitrile solution; then Add 5% carbon nanotubes by weight of polyacrylonitrile into the polyacrylonitrile solution, continue to stir for 24 hours, and then electrospin the solution to obtain the polyacrylonitrile / carbon nanotubes. The parameters of electrospinning are set as follows : The applied voltage is 15kV, the solution propulsion speed is 0.5mL / h, the fiber collection distance is 15cm, and the flat plate is used to collect; the obtained polyacrylonitrile / carbon nanotube composite film is pre-oxidized at a temperature of 280°C for 3h in an air atmosphere, Then carbonize at a temperature of 900°C for 3 hours in a nitrogen atmosphere to obtain a carbon fiber / carbon nanotube composite film with a diameter of 0....

Embodiment 2

[0062] Add polyacrylonitrile with a molecular weight of 150000Da to the organic solvent N,N-dimethylformamide, heat to a temperature of 30°C and stir under magnetic stirring until all polyacrylonitrile is dissolved to obtain a polyacrylonitrile solution with a mass fraction of 7%; then Add 20% carbon nanotubes by weight of polyacrylonitrile into the polyacrylonitrile solution, continue stirring for 30 hours, then electrospin the solution to obtain the polyacrylonitrile / carbon nanotubes, and the electrospinning parameters are set as follows: The applied voltage was 12kV, the advancing speed of the solution was 0.1mL / h, and the fiber collection distance was 10cm, and collected by a roller; the obtained polyacrylonitrile / carbon nanotube composite film was pre-oxidized at 200°C for 0.5h in an oxygen atmosphere, Then carbonize at a temperature of 600° C. for 1 h under a nitrogen atmosphere to obtain a carbon fiber / carbon nanotube composite film with a diameter of 0.3-2 μm.

[0063]...

Embodiment 3

[0067] Add polyacrylonitrile with a molecular weight of 150000Da to the organic solvent N,N-dimethylformamide, heat to a temperature of 40°C and stir under magnetic stirring until the polyacrylonitrile is completely dissolved to obtain a polyacrylonitrile solution with a mass fraction of 8.5%; then Add 10% carbon nanotubes by weight of polyacrylonitrile into the polyacrylonitrile solution, continue stirring for 10 hours, then electrospin the solution to obtain the polyacrylonitrile / carbon nanotubes, and the electrospinning parameters are set as follows: The applied voltage is 20kV, the solution propulsion speed is 0.8mL / h, the fiber collection distance is 20cm, and the rollers are used to collect; the obtained polyacrylonitrile / carbon nanotube composite film is pre-oxidized at a temperature of 220°C in an air atmosphere for 6h, and then Carbonize at 800° C. for 12 hours in a nitrogen atmosphere to obtain a carbon fiber / carbon nanotube composite film with a diameter of 1-5 μm. ...

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Abstract

The invention discloses a carbon fiber / carbon nanotube composite membrane as well as a preparation method and application thereof. The preparation method comprises the following steps of adding polyacrylonitrile into N,N-dimethylformamide as organic solvent, heating the mixed solution to be 30 to 60DEG C, stirring the mixed solution until the polyacrylonitrile is completely dissolved, and configuring to obtain a polyacrylonitrile solution with the mass fraction of 7 to 12 percent; then adding 0 to 20 percent of carbon nanotube counted according to the weight of the polyacrylonitrile into the polyacrylonitrile solution for continuously stirring, and performing electrostatic spinning on the solution to obtain a polyacrylonitrile / carbon nanotube composite membrane; performing preoxidation on the polyacrylonitrile / carbon nanotube composite membrane at the temperature of 200 to 300DEG C for 0.5 to 8 hours, and carbonizing the preoxidized polyacrylonitrile / carbon nanotube composite membrane at the temperature of 600 to 1,100DEG C for 1 to 12 hours to obtain the carbon fiber / carbon nanotube composite membrane. According to the carbon fiber / carbon nanotube composite membrane disclosed by the invention, a carbon fiber / carbon nanotube is taken as a cathode material of a lithium ion battery, and the specific capacity of the lithium ion battery is 1,850 to 2,459mAh / g.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, and relates to a carbon fiber / carbon nanotube composite film, a preparation method thereof, and an application of the composite film as a negative electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries have attracted great research interest due to their high energy density and low cost. As energy storage and conversion devices, lithium-ion batteries occupy a dominant position in the market of portable electronic devices (such as mobile phones, computers, cameras, etc.), and are expected to be used in electric vehicles, hybrid vehicles and renewable energy (such as wind energy, solar energy, etc.) ) in large-scale energy storage equipment, has a wide range of application prospects. Nevertheless, lithium-ion batteries still have many problems and challenges. On the one hand, the current commercialized negative electrode material gr...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/583H01M10/0525
CPCH01M4/133H01M4/1393H01M4/583H01M10/0525Y02E60/10
Inventor 王斌程建丽黄玲
Owner INST OF CHEM MATERIAL CHINA ACADEMY OF ENG PHYSICS
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