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An organic polymer sulfur/nanocarbon-based composite material and its application in lithium-sulfur batteries

A composite material, lithium-sulfur battery technology, applied in nanotechnology, battery electrodes, nanotechnology, etc., can solve the problems of capacity fading, slow dissolution, reduced Coulomb efficiency, etc., to achieve improved conductivity, mild reaction, and improved overall performance. Effect

Active Publication Date: 2021-04-20
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through this kind of physical method, although good electrochemical performance can be obtained in the initial stage of charge and discharge, as the charge and discharge are repeated, the sulfur bound in the pores will produce more sulfur and will slowly dissolve, resulting in rapid capacity fading and Coulomb Reduced efficiency

Method used

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  • An organic polymer sulfur/nanocarbon-based composite material and its application in lithium-sulfur batteries
  • An organic polymer sulfur/nanocarbon-based composite material and its application in lithium-sulfur batteries
  • An organic polymer sulfur/nanocarbon-based composite material and its application in lithium-sulfur batteries

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation process of the organic polymer sulfur / nano-carbon-based composite material in this embodiment is as follows figure 1 , the specific preparation process is: weigh 6.4g sublimated sulfur and 24g sodium sulfide nonahydrate (Na 2 S·9H 2 O) into 100ml of deionized water, under the protection of inert gas, stir until clarified to obtain an aqueous sodium trisulfide solution with a concentration of 1mol / L. Weigh 7.3g of cetyltrimethylammonium bromide surfactant and dissolve it in 190mL of deionized water, stir until clear, add 500mg of graphene and stir for 1h, add 10mL of the sodium trisulfide solution prepared above, stir for 0.5h, Then add 2.15mL trichloropropane, stir for 4 hours, and process at a temperature of 30°C to obtain an organic polymer sulfur / graphene composite material solution. The solution is repeatedly washed with deionized water, centrifuged, and freeze-dried to finally obtain an organic polymer sulfur / Graphene composite material, the sulf...

Embodiment 2

[0032] The difference between embodiment 2 and embodiment 1 is that the kinds of sodium polysulfide and surfactant are different. Weigh 9.6 g of sublimed sulfur and 24 g of sodium sulfide nonahydrate into 100 ml of deionized water, and stir until clarified under the protection of an inert gas to obtain an aqueous sodium tetrasulfide solution with a concentration of 1 mol / L. Weigh 7.3g of sodium lauryl sulfate surfactant and dissolve it in 190mL of deionized water, stir until clear, add 600mg of graphene and stir for 1h, add 10mL of sodium trisulfide prepared above, stir for 0.5h, then add 2.15mL of trisulfide Chloropropane, stirring time 4h, processing temperature 30 ℃, obtain organic polymer sulfur / graphene composite material solution, this solution is repeatedly washed with deionized water, centrifuged, freeze-dried, finally obtain organic polymer sulfur / graphene composite material , the sulfur content in the prepared organic polymer sulfur / graphene composite material is 65w...

Embodiment 3

[0034] The difference between embodiment 3 and embodiment 1 is that the kinds of sodium polysulfide and surfactant are different. Weigh 12.8 g of sublimed sulfur and 24 g of sodium sulfide nonahydrate into 100 ml of deionized water, and stir until clarified under the protection of an inert gas to obtain an aqueous solution of sodium pentasulfide with a concentration of 1 mol / L. Weigh 7.3g of polyethylene glycol octylphenyl ether surfactant and dissolve it in 190mL of deionized water, stir until clear, add 500mg of graphene and stir for 1h, add 10mL of sodium trisulfide prepared above, stir for 0.5h, then add 2.15 mL of trichloropropane, stirred for 4 hours, and treated at a temperature of 30 °C to obtain an organic polymer sulfur / graphene composite material solution. The solution was repeatedly washed with deionized water, centrifuged, and freeze-dried to finally obtain an organic polymer sulfur / graphene composite material solution. Wall carbon nanotube composite material, the...

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Abstract

The invention discloses an organic polymer sulfur / nano carbon-based composite material and its application in lithium-sulfur batteries, belonging to the technical field of battery materials. The present invention is an organic polymeric sulfur active material prepared by interfacial polymerization of organic matter and sodium polysulfide, then compounding organic polymer sulfur with nanometer carbon-based materials, and using it as a lithium-sulfur battery positive electrode. The invention utilizes the shuttle effect of the carbon-sulfur bond in the organic polymer to bind polysulfide ions, and improves the conductivity of the material by compounding with nano-carbon with excellent conductivity. The material is used in lithium-sulfur batteries, and the obtained lithium-sulfur batteries have excellent cycle stability and rate performance characteristics. The invention has the advantages of simple operation and easy structure regulation, and provides broad prospects for the application of the organic polymer sulfur in lithium-sulfur batteries.

Description

Technical field: [0001] The invention relates to the technical field of battery materials, in particular to an organic polymer sulfur / nano carbon-based composite material and its application in lithium-sulfur batteries. Background technique: [0002] With the rapid development of portable electronic devices, space technology, power grids and electric vehicles, people's requirements for batteries are becoming higher and higher. Among them, the development of new lithium batteries with high capacity, long cycle life, low cost and environmental friendliness has become A hot area of ​​research. In the new electrochemical energy storage system, the lithium-sulfur battery with metallic lithium as the negative electrode and elemental sulfur as the positive electrode has a theoretical specific energy of 2600Wh / kg, which is much higher than the lithium-ion batteries currently used. In addition, elemental sulfur is cheap and environmentally friendly, which makes the system extremely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/604H01M4/625H01M10/0525Y02E60/10
Inventor 李峰胡广剑孙振华成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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