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Preparation and Reactions of Sulfides02:26

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Sulfonic Acid-Functionalized Graphdiyne for Effective Li-S Battery Separators.

Yang Kong1, Xuming Qiu2, Yurui Xue1

  • 1Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion, Science Center for Material Creation and Energy Conversion, Institute of Frontier Chemistry, School of Chemistry and Chemical Engineering, Shandong University, Qingdao 266237, P.R. China.

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Summary
This summary is machine-generated.

A novel SO3H-functionalized graphdiyne (SOGDY) separator effectively suppresses lithium dendrites and polysulfide shuttling in lithium-sulfur (Li-S) batteries. This advancement enables stable, high-performance Li-S energy storage, even at low temperatures.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-sulfur (Li-S) batteries offer high energy density but suffer from lithium dendrite growth and lithium polysulfide (LiPSs) shuttling.
  • Existing separators often fail to adequately address these critical challenges, limiting practical application.

Purpose of the Study:

  • To develop a modified separator for Li-S batteries that enhances stability and performance.
  • To investigate the efficacy of SO3H-functionalized graphdiyne (SOGDY) in mitigating dendrite formation and LiPSs shuttling.

Main Methods:

  • Grafting sulfonic acid groups (SO3H) onto graphdiyne (GDY) to create SOGDY.
  • Utilizing SOGDY as a separator in Li-S battery configurations.
  • Conducting electrochemical testing, including symmetric cell cycling and Li-S battery performance evaluation at various temperatures and rates.

Main Results:

  • SOGDY maintains the graphdiyne's all-carbon network and uniform nanopores, facilitating rapid Li+ transport and even lithium deposition.
  • The SO3H groups effectively inhibit LiPSs shuttling through spatial obstruction and polar adsorption.
  • SOGDY separators demonstrated exceptional stability over 3500 hours in Li||Li symmetric cells and excellent low-temperature, high-rate performance in Li-S batteries.

Conclusions:

  • SOGDY is a highly effective separator material for advanced Li-S batteries.
  • The strategy of incorporating stable all-carbon networks with functionalized nanopores is a promising approach for improving Li-S battery technology.