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Zinc sulfide/porous carbon nano-fiber composite material and preparation method thereof

A technology of nanofibers and composite materials, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of poor material structure stability, limited application of composite materials, high requirements for process equipment, etc., to achieve inhibition Effect of agglomeration, improvement of cycle stability, and mitigation of volume change

Inactive Publication Date: 2019-02-15
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method has a wide range of sources of raw materials, but the requirements for process equipment are high, and the stability of the material structure is poor, which greatly limits the application of the composite material

Method used

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  • Zinc sulfide/porous carbon nano-fiber composite material and preparation method thereof
  • Zinc sulfide/porous carbon nano-fiber composite material and preparation method thereof
  • Zinc sulfide/porous carbon nano-fiber composite material and preparation method thereof

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Effect test

Embodiment 1

[0020] (1) The present invention is first based on the invention patent that our research group has applied for: a porous carbon nanofiber membrane for lithium-sulfur battery positive electrode material and its preparation method (CN105161722A), and polytetrafluoroethylene aqueous emulsion, polyvinyl alcohol Solution and boric acid solution were blended to prepare spinning solution, and polyvinyl alcohol / polyvinylidene fluoride nanofibers were prepared by electrostatic melt blowing method. preoxidation treatment to obtain preoxidized polyvinyl alcohol / polyvinylidene fluoride nanofibers.

[0021] (2) Dissolve 7mmol of zinc acetate and 14mmol of thiourea in 70mL of ethylene glycol, then add 8.4g of pre-oxidized fibers for ultrasonic dispersion for 30min, then transfer to a reactor, and react at 160°C for 12h. After centrifugal washing and drying at 60°C for 12 hours, preoxidized polyvinyl alcohol / polyvinylidene fluoride nanofibers loaded with zinc sulfide precursor were obtained...

Embodiment 2

[0024] (1) The present invention is first based on the invention patent that our research group has applied for: a porous carbon nanofiber membrane for lithium-sulfur battery positive electrode material and its preparation method (CN105161722A), and polytetrafluoroethylene aqueous emulsion, polyvinyl alcohol Solution and boric acid solution were blended to prepare spinning solution, and polyvinyl alcohol / polyvinylidene fluoride nanofibers were prepared by electrostatic melt-blowing method. preoxidation treatment to obtain preoxidized polyvinyl alcohol / polyvinylidene fluoride nanofibers.

[0025](2) Dissolve 7mmol of zinc nitrate and 14mmol of thioacetamide in 70mL of distilled water, then add 16.8g of pre-oxidized fibers for ultrasonic dispersion for 60min, then transfer to a reactor, and react at 80°C for 6h. After centrifugal washing and drying at 60°C for 12 hours, preoxidized polyvinyl alcohol / polyvinylidene fluoride nanofibers loaded with zinc sulfide precursor were obtai...

Embodiment 3

[0028] (1) The present invention is first based on the invention patent that our research group has applied for: a porous carbon nanofiber membrane for lithium-sulfur battery positive electrode material and its preparation method (CN105161722A), and polytetrafluoroethylene aqueous emulsion, polyethylene Alcohol solution and boric acid solution were blended to prepare spinning solution, and polyvinyl alcohol / polyvinylidene fluoride nanofibers were prepared by electrostatic solution blowing method. In the air atmosphere, the temperature was raised to 300°C at a rate of 2°C / min and kept for 3h for nanofibers. Perform pre-oxidation treatment to obtain pre-oxidized polyvinyl alcohol / polyvinylidene fluoride nanofibers.

[0029] (2) Dissolve 7mmol of zinc sulfide and 14mmol of thiourea in 70mL of ethanol, then add 4.2g of pre-oxidized fibers for ultrasonic dispersion for 60min, then transfer to the reactor, and react at 70°C for 6h. After centrifugal washing and drying at 50°C for 8 ...

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Abstract

The invention provides a preparation method of a zinc sulfide / porous carbon nano-fiber composite material. The preparation method comprises the following steps: firstly, loading a zinc sulfide precursor on pre-oxidized polyvinyl alcohol / polytetrafluoroethylene nanofibers through a solvent thermal method; carrying out high-temperature carbonization, and synchronously generating zinc sulfide nanoparticles and porous carbon nanofibers; forming a stable corn cob-like composite structure (porous carbon nanofibers are aaaused as a carbon skeleton and the zinc sulfide nanoparticles are uniformly anchored). The composite material served as an anode of a lithium-ion battery has the beneficial effects that nano zinc sulfide with high theoretical specific capacity ensures high energy density of the material; a three-dimensional conductive network formed by porous carbon nanofibers enhances the conductivity of the material and ensures the high power density of the material; the corn cob-like structure facilitates full contact between an active material and electrolyte; meanwhile, the volume change of an active material during insertion / lithiation is effectively alleviated. In addition, the method has the advantages of simple operation, low cost, high efficiency and easiness in practical application and popularization.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and in particular relates to a zinc sulfide / porous carbon nanofiber composite material and a preparation method thereof. Background technique [0002] As an important part of lithium-ion batteries, negative electrode materials directly affect the energy density, cycle life and safety performance of batteries. At present, the commercially mature anode materials are carbon-based materials, such as graphite, carbon microspheres, and pyrolytic carbon. However, carbon materials cannot meet the requirements of high-performance ion batteries due to their low theoretical capacity (372mA·h / g). Zinc sulfide (ZnS) is considered to be an ideal alternative carbon anode material due to its high theoretical specific capacity (962mAh / g), non-toxicity, and cheap raw materials. However, due to the low electrical conductivity and large volume expansion of zinc sulfide material...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/5815H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 程博闻王利媛康卫民鞠敬鸽邓南平闫静赵慧娟汪港
Owner TIANJIN POLYTECHNIC UNIV
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