Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Carbon nanosphere/sulfur composite material and its preparation method and application

A technology of carbon nanospheres and composite materials, applied in the field of nanomaterials and electrochemical energy, can solve the problems of low battery capacity and discharge platform, affecting battery energy density, etc., and achieve the effects of improving electrical activity, enhancing physical adsorption, and inhibiting dissolution Effect

Active Publication Date: 2019-08-20
WENZHOU UNIVERSITY
View PDF4 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Carbon nanosphere/sulfur composite material and its preparation method and application
  • Carbon nanosphere/sulfur composite material and its preparation method and application
  • Carbon nanosphere/sulfur composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
thicknessaaaaaaaaaa
widthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a carbon nanosphere / sulfur composite material and its preparation method and application, comprising carbon nanospheres and elemental sulfur. There is a gap, the carbon sheet is folded, there is a gap between the carbon sheet and the carbon sheet, the carbon sheet is provided with a through hole, and the elemental sulfur is combined with the carbon nanosphere by the melt infiltration method to form a carbon nanosphere / sulfur composite material, Among them, sulfur accounts for 75‑84 wt% of the composite. The gaps and through holes in carbon nanospheres are convenient for the molten loading of sulfur and the diffusion and ion transport of electrolyte ions. Carbon nanospheres with large specific surface area can load more sulfur active substances and effectively inhibit the dissolution of polysulfides. Doping nitrogen on the nanospheres improves the electrical activity of the carbon material and enhances the physical adsorption of sulfur, and the carbon nanosphere / sulfur composite material can be used as the positive electrode of the lithium-sulfur battery, improving the capacity, rate performance, and cycle performance of the sulfur-lithium battery. stability and Coulombic efficiency.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com