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Engineering Fe-N Coordination Structures for Fast Redox Conversion in Lithium-Sulfur Batteries.

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Advanced Materials (Deerfield Beach, Fla.)
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Summary

This study introduces a novel catalyst, single-atom iron and iron nitride embedded in nitrogen-doped graphene (SA-Fe/Fe2N@NG), to improve lithium-sulfur batteries by reducing polysulfide shuttling and enhancing electrochemical performance.

Keywords:
Fe 2N nanocrystalsFe-N coordination structuresintegrated catalystslithium-sulfur batteriessingle-atom Fe

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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 sluggish redox kinetics and polysulfide shuttling, limiting their performance.
  • Polysulfide shuttling (Li2Sn, n=4-8) leads to capacity decay and poor cycle life in Li-S batteries.
  • Developing effective catalysts to mitigate these issues is crucial for advancing Li-S battery technology.

Purpose of the Study:

  • To address the critical drawbacks of Li-S batteries by designing an integrated catalyst with dual active sites.
  • To enhance the electrochemical performance and cycle stability of Li-S batteries through synergistic catalysis.
  • To investigate the efficacy of single-atom (SA)-Fe and polar Fe2N co-embedded in nitrogen-doped graphene (SA-Fe/Fe2N@NG) as a catalyst.

Main Methods:

  • Co-embedding single-atom (SA)-Fe and polar Fe2N in nitrogen-doped graphene (NG) to create the SA-Fe/Fe2N@NG catalyst.
  • Utilizing the synergistic adsorption of polysulfides and catalytic selectivity of SA-Fe (Fe-4N coordination) and Fe2N (Fe-3N coordination) for Li2Sn lithiation and Li2S delithiation, respectively.
  • Modifying the separator with SA-Fe/Fe2N@NG to achieve polysulfide confinement and catalysis, accelerating bidirectional conversion (Li2Sn↔Li2S) and suppressing the shuttle effect.

Main Results:

  • The SA-Fe/Fe2N@NG-modified separator demonstrated optimal polysulfide confinement-catalysis ability.
  • The catalyst effectively accelerated the bidirectional liquid-solid conversion of polysulfides and suppressed the shuttle effect.
  • A Li-S battery utilizing the SA-Fe/Fe2N@NG separator achieved 84.1% capacity retention over 500 cycles at 1 C and a high areal capacity of 5.02 mAh cm-2 at 0.1 C.

Conclusions:

  • The integrated SA-Fe/Fe2N@NG catalyst effectively overcomes the limitations of sluggish redox kinetics and polysulfide shuttling in Li-S batteries.
  • The synergistic effect of dual active sites (SA-Fe and Fe2N) provides enhanced polysulfide management and catalytic activity.
  • This study provides a promising strategy for designing high-efficiency catalysts for long-lasting and high-performance Li-S batteries.