Carbon nanosphere/sulfur composite and preparation method and application thereof

A technology of carbon nanospheres and composite materials, applied in the field of nanomaterials and electrochemical energy, can solve the problems affecting battery energy density, battery capacity and low discharge platform, achieve enhanced physical adsorption, improve electrical activity, and facilitate rapid delivery Effect

Active Publication Date: 2017-01-18
WENZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tiny pores are not only not conducive to the penetration of sulfur into the material, but also limit the assembly of sulfur nanoparticles, resulting in a low overall battery capacity and discharge platform, thus affecting the energy density of the overall battery.

Method used

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  • Carbon nanosphere/sulfur composite and preparation method and application thereof
  • Carbon nanosphere/sulfur composite and preparation method and application thereof
  • Carbon nanosphere/sulfur composite and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0041] Step 2, preparation of nitrogen-doped hierarchical porous carbon nanospheres:

[0042] Weigh 1 g of chitosan and 0.5 g of the above-prepared silica nanospheres to mix, stir and dissolve in 150 mL of 2% acetic acid aqueous solution, then transfer to a 250 ml polytetrafluoroethylene hydrothermal reaction kettle, heat And keep it at 180°C for 12h, after cooling, filter, wash with water and ethanol successively, dry, heat treat at 800°C for 2h in argon atmosphere, add the obtained black powder into 10 mL of 20% hydrofluoric acid solution and stir, then Filtration and drying were performed sequentially to obtain nitrogen-doped hierarchical porous carbon nanospheres (FNCS) with a flower structure.

[0043] Summary: The mass ratio of the above variable chitosan to silica nanospheres is 2:1, which belongs to 1:1-4:1, and the heat treatment temperature under argon atmosphere is 800°C, which belongs to 700-900°C.

[0044] Step 3. Synthesis of nitrogen-doped hierarchical porous c...

Embodiment 1

[0053] Take 0.08 g of the flower-shaped nitrogen-doped hierarchical porous carbon nanosphere (FCNS) sample prepared in step 2, mix with 0.42 g of sulfur powder, seal it, heat it in an oven at 160 ° C, cool it out after 10 hours, and obtain the flower shape Structural nitrogen-doped hierarchically porous carbon nanosphere / sulfur composites. According to the method in step 4, prepare electrodes and assemble batteries, and perform routine performance tests, the discharge capacity is 1005 mA h g at 1 C rate -1 .

Embodiment 2

[0055] Take 0.08 g of the flower-shaped nitrogen-doped hierarchical porous carbon nanosphere (FCNS) sample prepared in step 2, mix with 0.24 g of sulfur powder, seal it, heat it in an oven at 160 ° C, cool it for 10 hours, and take it out to obtain the flower shape Structural nitrogen-doped hierarchically porous carbon nanosphere / sulfur composites. According to the method in Example 1, the electrode and assembled battery were prepared, and the performance was routinely tested. The discharge capacity was 1100 mA h g at 1 C rate -1 .

[0056] Summary: Variables in Example 1, Example 2 and Step 3 are the proportion of sulfur in the composite material, which are 84wt%, 75wt% and 80wt% respectively, 84wt%, 75wt%, 80wt% and 70wt% of the prior art respectively Compared with that, the discharge capacity at 1C rate has been improved. The capacity is calculated based on the mass of sulfur. High content of sulfur is the pursuit of this research field, but if the content of sulfur is too...

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Abstract

The invention discloses a carbon nanosphere / sulfur composite and a preparation method and application thereof. The carbon nanosphere / sulfur composite comprises a carbon nanosphere and elemental sulfur; the carbon nanosphere is composed of petal-shaped carbon plates which are combined into a sphere shape, gaps exist between the carbon plates, and the carbon plates are arranged in a wrinkled form and provided with through holes; the elemental sulfur and the carbon nanosphere are combined through a fusion permeation method to form the carbon nanosphere / sulfur composite, wherein sulfur accounts for 75-84 wt% of the composite. The gaps and through holes in the carbon nanosphere facilitate fusion loading of sulfur and dispersion and transportation of electrolyte ions, and the carbon nanosphere with a large specific surface area can load more sulfur active substances and effectively inhibit dissolution of polysulfide; the nitrogen element is doped on the carbon nanosphere to improve the electroactivity of a carbon material and enhance physisorption on sulfur; the carbon nanosphere / sulfur composite can serve as a positive electrode of a lithium-sulfur battery to improve the capacity, rate capability, cycling stability and coulombic efficiency of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the field of nanometer materials and electrochemical energy, and particularly relates to a carbon nanosphere / sulfur composite material and its preparation method and application. Background technique [0002] At present, with the rapid development of communication, portable electronic equipment, electric vehicles and space technology, it is imminent to develop batteries with higher energy density. The theoretical battery energy density of a lithium-sulfur battery (Li / S battery) with metallic lithium as the negative electrode and elemental sulfur as the positive electrode can reach 2600Wh kg -1 , the specific capacity of the sulfur cathode is 1675mA h g -1 , much larger than the commercialized secondary batteries used at this stage, the working voltage of the lithium-sulfur battery is about 2.0V, which can meet the application requirements of the current market. However, the insulation of the sulfur cathode, the Li generated d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62H01M10/0525H01M4/36B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/362H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 陈锡安郭大营郑聪邓文娟魏会方黄少铭
Owner WENZHOU UNIVERSITY
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