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One-dimensional porous carbon nanometer fiber material and preparation method and application thereof

A nanofiber, porous carbon technology, applied in fiber processing, fiber chemical characteristics, textiles and papermaking, etc., can solve the problems of reducing the actual capacity of the electrode with sulfur utilization, reducing the utilization rate of electrochemically active sulfur, and reducing the battery cycle stability. , to achieve the effect of convenient commercial application, low cost of raw materials, and excellent rate performance

Inactive Publication Date: 2019-06-11
QINGDAO NINEX NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commercialization of sulfur as a cathode material is still limited by the following problems: 1) Elemental sulfur and the discharge product Li 2 S 2 、LiS 2 2) The shuttle effect formed by the dissolution of polysulfides during the discharge process causes capacity attenuation and a decrease in Coulombic efficiency; 3) The volume expansion during the discharge process leads to electrode The collapse of the material structure reduces the cycle stability of the battery
[0003] In the traditional slurry coating method, a large amount of inactive ingredients (such as binders and conductive agents) are usually added, which account for about 20-30% of the entire electrode mass, which will greatly reduce the Sulfur utilization and actual capacity of the electrode

Method used

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  • One-dimensional porous carbon nanometer fiber material and preparation method and application thereof
  • One-dimensional porous carbon nanometer fiber material and preparation method and application thereof
  • One-dimensional porous carbon nanometer fiber material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of one-dimensional porous carbon nanofiber materials

[0034] (1) The carbon source (polyacrylonitrile with a molecular weight of 150,000), the templating agent (addition polymer of polypropylene glycol and ethylene oxide) and the conductive agent (carboxylated carbon nanotubes) into a solvent (N,N-dimethylformamide), stirred at 60°C for 12 hours, and then ultrasonicated for 30 minutes at a power of 360W and a frequency of 40KHz to obtain a spinning solution;

[0035] (2) Inject the spinning solution in step (1) into a 10mL syringe for use, and then set the electrospinning parameters: the injection speed is 0.0008mm / s, the distance between the needle tip of the injection and the collecting plate is 12cm, and the working voltage is 15kV , the fiber precursor was prepared by electrospinning;

[0036] (3) Dry the fiber precursor in step (2) at 60°C for 12 hours, then raise the temperature to 280°C at a rate of 1°C / min, keep it warm for 3 hours, then lower it t...

Embodiment 2

[0038] Preparation of one-dimensional porous carbon nanofiber materials

[0039] (1) Add carbon source (polyvinyl alcohol), templating agent (addition polymer of polypropylene glycol and ethylene oxide) and conductive agent (graphene oxide) to the solvent at a mass volume ratio of 1:0.4:35:24 (ethanol), stirred at 30°C for 24h to mix, and then ultrasonicated for 5h under the condition of power of 80W and frequency of 40KHz to obtain spinning solution;

[0040] (2) Inject the spinning solution in step (1) into a 10mL syringe for use, and then set the electrospinning parameters: the injection speed is 0.0015mm / s, the distance between the needle tip of the injection and the collecting plate is 30cm, and the working voltage is 40kV , the fiber precursor was prepared by electrospinning;

[0041] (3) Dry the fiber precursor in step (2) at 100°C for 12 hours, then raise the temperature to 200°C at a rate of 3°C / min, keep it warm for 5 hours, then lower it to room temperature at a ra...

Embodiment 3

[0043] Preparation of one-dimensional porous carbon nanofiber materials

[0044] (1) The carbon source (polyvinylpyrrolidone), templating agent (addition polymer of polypropylene glycol and ethylene oxide) and conductive agent (carboxylated carbon nanotubes) were sequentially mixed according to the mass volume ratio of 1:0.2:94:18 Add it into the solvent (methanol), stir at 90°C for 10h to mix, and then ultrasonicate for 2h under the condition of power of 200W and frequency of 40KHz to obtain spinning solution;

[0045] (2) Inject the spinning solution in step (1) into a 10mL syringe for use, and then set the electrospinning parameters: the injection speed is 0.0003mm / s, the distance between the needle tip of the injection and the collecting plate is 20cm, and the working voltage is 35kV , to prepare fiber precursor by electrospinning;

[0046] (3) Dry the fiber precursor in step (2) at 80°C for 24h, then raise the temperature to 380°C at a rate of 5°C / min, keep it warm for 2h,...

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Abstract

The invention relates to a one-dimensional porous carbon nanometer fiber material and a preparation method and application thereof, and belongs to the technical field of lithium-sulfur battery materials. The method comprises the steps that firstly, a carbon source, a template agent and a conductive agent are added into a solvent and mixed to be uniform to obtain a spinning solution ultrasonically,then, a fiber precursor is obtained through electrostatic spinning, and finally, the fiber precursor is dried, pre-oxidized and calcinated to obtain the presser foot spanner cam component. Accordingto the method, by adjusting parameters of electrostatic spinning, the diameter of the finally-prepared carbon nanometer fiber is controlled, and in the later period, the specific area, the hole size and the aperture range of the finally-prepared one-dimensional porous carbon nanometer fiber material are controlled by controlling the pre-oxidization and calcination technological conditions. The one-dimensional porous carbon nanometer fiber material has the long coruscation stability, excellent rate capability and large reversible volume, and the one-dimensional porous carbon nanometer fiber material can be adopted as an anode material of a lithium-sulfur battery. The material preparation technology is simple, operation is easy, the raw materials are low in cost, the needed preparation conditions are low, and commercial application is facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur battery materials, and in particular relates to a one-dimensional porous carbon nanofiber material and its preparation method and application. Background technique [0002] Due to the advantages of high working voltage, high energy density (light weight), no memory effect, long cycle life and no pollution, lithium-ion secondary batteries have become the preferred power source for various electronic products in recent years. However, with the advent of the mobile Internet era, the miniaturization of electronic equipment, and the large-scale development and application of electric bicycles, electric vehicles, and large-scale energy storage power stations, higher specific capacity requirements have been put forward for lithium-ion secondary batteries. Lithium-sulfur batteries are expected to replace existing commercial lithium-ion batteries due to their high theoretical capacity (1675mAh / g) an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/22D01F9/21D01F1/09D01D5/00H01M4/583H01M4/62H01M10/052
CPCY02E60/10
Inventor 李长明陈跃吴超常艳艳
Owner QINGDAO NINEX NEW ENERGY TECH CO LTD
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