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Co single-atom catalyst on ordered macro-microporous structure as separator for Li-S battery.

Wenhui Cao1, Mengyu Liu1, Kai Zhang1

  • 1State Key Laboratory Base of Eco-Chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, College of Chemistry and Molecular Engineering, College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.

Journal of Colloid and Interface Science
|January 18, 2025
PubMed
Summary

This study introduces a novel catalyst for lithium-sulfur (Li-S) batteries, significantly improving performance. The catalyst enhances Li-S battery stability and efficiency, reducing capacity decay.

Keywords:
Lithium-sulfur batteriesOrdered structureShuttle effectSingle-atom catalysts

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-sulfur (Li-S) batteries offer high theoretical energy density and low cost, making them promising for next-generation energy storage.
  • Key challenges include sluggish reaction kinetics and the shuttle effect of lithium polysulfides (LiPSs), hindering electrochemical performance.

Purpose of the Study:

  • To design and synthesize a cobalt single-atom catalyst on nitrogen-doped carbon (CoSAC-NC) with an ordered macro-microporous structure.
  • To improve the electrochemical performance of Li-S batteries by mitigating the shuttle effect and enhancing reaction kinetics.

Main Methods:

  • Co single-atom catalyst (CoSAC-NC) synthesized on an ordered macro-microporous structure.
  • Catalyst coated onto a 2325 separator to interact with LiPSs and promote their conversion.
  • Electrochemical performance evaluated over 1000 cycles at 1C.

Main Results:

  • The ordered micro-microporous structure of CoSAC-NC enhanced LiPSs interaction and provided a reservoir.
  • Highly exposed Co-Nx active sites effectively anchored LiPSs, promoting rapid conversion.
  • Achieved an exceptionally low capacity decay rate of 0.043% per cycle over 1000 cycles at 1C.

Conclusions:

  • The developed CoSAC-NC catalyst significantly improves Li-S battery cathode utilization efficiency.
  • The catalyst effectively suppresses the shuttle effect and enhances reaction kinetics, leading to superior cycling stability.
  • This approach offers a promising strategy for advancing high-performance Li-S battery technology.