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Hollow nanofiber Co3O4/S composite material as well as preparation method and application thereof

A technology of composite materials and nanofibers, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low specific capacity and poor positive electrode conductivity, etc., and achieve high specific capacity and good rate performance , good cycle stability

Active Publication Date: 2020-01-17
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of hollow nanofiber Co 3 o 4 The / S composite material and its preparation method and application solve the problems of poor conductivity and low specific capacity of the positive electrode of the existing lithium battery, and can improve the specific capacity and have good rate performance

Method used

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  • Hollow nanofiber Co3O4/S composite material as well as preparation method and application thereof
  • Hollow nanofiber Co3O4/S composite material as well as preparation method and application thereof
  • Hollow nanofiber Co3O4/S composite material as well as preparation method and application thereof

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Embodiment 1

[0036] (1) 1.2g Co(CH 3 COO) 2 4H 2 O (cobalt acetate tetrahydrate), 0.5g PAN (polyacrylonitrile) and 0.1g PVP (polyvinylpyrrolidone) were dissolved in 15ml DMF (N,N-dimethylformamide), and stirred under electromagnetic stirring at room temperature for 15-18h , standing for 12 to 15 hours to obtain electrospinning solution;

[0037] (2) Use a syringe (needle inner diameter 1.2mm) to extract the electrospinning liquid prepared in step (1), fix it on a high-voltage electrospinning machine for electrospinning, and use carbon paper as a receiving device to collect, the voltage is 15kV, and the needle and carbon The paper spacing is 12-15 cm, the injection flow rate is 60 μL / min, the temperature is 21-25 °C, and the relative humidity is 80%, to prepare nanofibers;

[0038] (3) oxidizing the nanofibers prepared in step (2) in air at 300°C for 2 hours, thereby preparing the HCON material;

[0039] (4) After mixing sulfur and the HCON material prepared in step (3), place it at 155...

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Abstract

The invention discloses a hollow nanofiber Co3O4 / S composite material as well as a preparation method and application thereof. The method comprises the following steps of (1) dissolving cobalt acetate, polyacrylonitrile and polyvinylpyrrolidone in an organic solvent, stirring at room temperature, and standing to obtain an electrospinning solution; (2) extracting an electrospinning solution, carrying out electrostatic spinning, collecting a sample by using a carbon paper, and preparing the nanofiber on the conditions that the voltage is 15kV, the distance between a needle head of the electrostatic spinning and the carbon paper is 12-15cm, the injection flow rate is 60mu L / min, the temperature is 21-25 DEG C, and the relative humidity is 80%; (3) oxidizing the nanofiber in air at 300 DEG C to obtain an HCON material; and (4) mixing sulfur and the HCON material, and carrying out heat preservation at 155 DEG C to prepare the hollow nanofiber Co3O4 / S composite material. The composite material provided by the invention can inhibit the shuttle effect of polysulfide, improves the specific capacity and has the very good rate capability.

Description

technical field [0001] The invention relates to a hollow nanofiber composite material, in particular to a hollow nanofiber Co 3 o 4 / S composite material and its preparation method and application. Background technique [0002] Lithium-sulfur battery is an energy storage system with high specific capacity (1675mAh / g) and high energy density (2600Wh / Kg), and the sulfur element in the positive electrode of lithium-sulfur battery has no pollution to the environment. However, lithium-sulfur batteries still have the following problems: [0003] (1) The poor conductivity of sulfur leads to its low utilization rate; [0004] (2) The decomposition and shuttle effect of polar polysulfides lead to a decrease in specific capacity; [0005] (3) The specific capacity retention rate after multiple cycles is low, resulting in a short service life. [0006] In recent decades, a lot of progress has been made in the research of cathode materials in lithium-sulfur batteries, and the devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/38H01M4/62H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 刘守法乔勋赵金国赵松
Owner XIJING UNIV
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