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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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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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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
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Bivalent Cobalt as Efficient Catalyst Intercalation Layer Improves Polysulfide Conversion in Lithium-Sulfur

Peirong Lin1, Yuheng Qi1, Daying Guo1,2,3

  • 1Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, P. R. China.

Chemsuschem
|March 5, 2023
PubMed
Summary

Cobalt-II in organic frameworks enhances lithium-sulfur battery performance by improving polysulfide reaction kinetics. This study demonstrates Co-ZIF

Keywords:
Catalytic intercalationlithium-sulfur batteriespolysulfidesshuttle effectvalences

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Lithium-sulfur batteries (LSBs) face challenges with polysulfide shuttle and slow reaction kinetics.
  • Cobalt-based organic frameworks offer potential as functional separators to mitigate these issues.

Purpose of the Study:

  • To investigate the impact of metal valence in cobalt-based organic frameworks on LSB performance.
  • To explore the catalytic activity of different cobalt valences for polysulfide conversion and shuttle effect inhibition.

Main Methods:

  • Synthesis of zeolite-imidazole-based cobalt organic framework compound (Co-ZIF) and tetrakis(4-benzoic acid) porphyrinato-CoIII chloride [Co-TBP(III)] with varying cobalt valences.
  • Electrochemical testing of LSBs utilizing these compounds as intercalation separators.
  • Theoretical calculations to elucidate the mechanism of catalytic activity.

Main Results:

  • CoII demonstrated superior catalytic activity compared to CoIII due to stronger polysulfide adsorption and a higher Fermi level.
  • Co-ZIF as a catalytic layer achieved a discharge specific capacity of 772.7 mAh g-1 at 5 C.
  • Exceptional cycling stability with an initial capacity of 839.6 mAh g-1 at 3 C, a low attenuation rate of 0.092% per cycle, and >92% coulombic efficiency after 720 cycles.

Conclusions:

  • Cobalt-II in organic frameworks significantly enhances the reaction kinetics of sulfur species in LSBs.
  • The optimized Co-ZIF separator effectively suppresses the shuttle effect and improves overall battery performance and longevity.