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

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...

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

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