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Cobalt disulfide/carbon nanofiber composite material and preparation method thereof

A carbon nanofiber, cobalt disulfide technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex preparation process, poor long-term battery cycle performance, etc. The effect of enhancing electrochemical performance and releasing internal stress

Inactive Publication Date: 2019-01-11
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the existing patents and literature, it can be seen that the current anode materials for cobalt disulfide sodium ion batteries have problems such as complex preparation procedures and poor long-term battery cycle performance.

Method used

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  • Cobalt disulfide/carbon nanofiber composite material and preparation method thereof
  • Cobalt disulfide/carbon nanofiber composite material and preparation method thereof
  • Cobalt disulfide/carbon nanofiber composite material and preparation method thereof

Examples

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preparation example Construction

[0033] The invention provides a preparation method of a cobalt disulfide / carbon nanofiber composite material, comprising: S1A) carbonizing a polyacrylonitrile / polystyrene composite nanofiber film to obtain a carbon nanofiber film; S1B) making an organic acid cobalt salt 1. The organic sulfur source is mixed with a glycol solvent to obtain a mixed solution; the organic sulfur source contains amino groups; S2) the carbon nanofiber film is mixed with the mixed solution, and after hydrothermal reaction, cobalt disulfide / carbon nanofibers are obtained Composite material; wherein the steps S1A) and S1B) are in no particular order.

[0034] see figure 1 , figure 1 Schematic diagram of the synthesis of the cobalt disulfide / carbon nanofiber composite material provided by the present invention.

[0035] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0036] The polyacrylonitrile / polystyrene compos...

Embodiment 1

[0054] Take 5.3g of N,N-dimethylformamide and slowly pour it into the conical flask, then add 4.2g of polyacrylonitrile into the conical flask, mix and fully stir for 7 hours, then slowly add 0.68g of polystyrene Ethylene, and then the three were continuously stirred for 8 hours, and the temperature of the stirring was 45°C; after stirring evenly, the solution was introduced into the injection syringe of the electrospinning instrument, and the working voltage of the electrospinning was set to 13kV, and the sample delivery rate was 3μL / min, the distance between the needle and the conductive roller is 14cm, the working time is 12h, and the humidity in the cabin of the electrospinning instrument is controlled between 10% and 25%, to obtain polyacrylonitrile / polystyrene composite nanofiber membrane.

[0055] The polyacrylonitrile / polystyrene composite nanofiber membrane was cut into pieces with scissors, and then placed in a muffle furnace for pre-carbonization in air; the pre-car...

Embodiment 2

[0059] Take 5.3g of N,N-dimethylformamide and slowly pour it into the conical flask, then add 4.2g of polyacrylonitrile into the conical flask, mix and fully stir for 7 hours, then slowly add 0.68g of polystyrene Ethylene, and then the three were continuously stirred for 8h, and the temperature condition of the stirring was 45°C.

[0060] After stirring evenly, introduce the solution into the injection syringe of the electrospinning instrument, set the working voltage of the electrospinning to 17kV, the sample feeding rate to 3μL / min, the distance between the needle and the conductive roller to 10cm, the working time to 12h, and control The humidity in the cabin of the electrostatic spinning apparatus is between 10% and 25%, and a polyacrylonitrile / polystyrene composite nanofiber membrane is obtained.

[0061] The polyacrylonitrile / polystyrene composite nanofiber membrane was cut into pieces with scissors, and then placed in a muffle furnace for pre-carbonization in air; the p...

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Abstract

The invention provides a preparation method of a cobalt disulfide / carbon nanofiber composite material, comprising the following steps: S1A) carbonizing a polyacrylonitrile / polystyrene composite nanofiber membrane to obtain a carbon nanofiber membrane; S1B) mixing cobalt salt of organic acid, organic sulfur source and diol solvent to obtain mixed solution,the organic sulfur source containing aminogroups; S2) mixing the carbon nanofiber membrane with the mixed solution and hydrothermally reacting to obtain a cobalt disulfide / carbon nanofiber composite material. As that carry of the cobalt disulfide material, the multi-channel carbon nanofibers of the invention can enhance the conductivity of the cobalt disulfide and provide an effective buff space for the volume change of the cobalt disulfide; and compared with the prior art, the multi-channel carbon nanofibers of the invention can enhance the conductivity of the cobalt disulfide and provide an effective buffer space for the volume change of the cobalt disulfide; Moreover, the self-assembled nanofibers formed a wrinkled cobalt disulfide nanolayer structure on the surface of carbon nanofibers, which has a large specific surface area,which is conducive to the exchange and transfer of sodium ions and electrons, and also conducive to the electrolyte immersion, and enhances the electrochemical properties of the composite materials.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a cobalt disulfide / carbon nanofiber composite material and a preparation method thereof. Background technique [0002] Sodium-ion battery is a kind of energy storage battery. Its working principle is similar to that of lithium-ion battery. It uses the complex process of inserting and extracting sodium ions between the positive and negative electrodes to realize the charging and discharging of current. Compared with traditional lithium-ion batteries, the source of raw materials for sodium-ion batteries is more extensive, and the price is low. It is estimated that the cost of raw materials for sodium-ion batteries can be reduced by half by using iron-manganese-nickel-based cathode materials compared with ternary cathode materials for lithium-ion batteries. . Therefore, sodium-ion battery technology has received extensive attention and in-depth research fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/5815H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 张和平潘月磊程旭东龚伦伦
Owner UNIV OF SCI & TECH OF CHINA
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