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Double-Layered Modified Separators as Shuttle Suppressing Interlayers for Lithium-Sulfur Batteries.

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Summary

A novel double-layered separator effectively suppresses polysulfide shuttling in lithium-sulfur batteries. This modification enhances initial capacity and Coulombic efficiency, improving battery performance.

Keywords:
lithium−sulfur batteriespoly(methyl methacrylate)polysulfidesseparatorshuttling

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Polysulfide shuttling in lithium-sulfur batteries causes significant capacity loss.
  • Separator modification is a key strategy to mitigate these detrimental effects.
  • Developing advanced separators is crucial for high-performance lithium-sulfur batteries.

Purpose of the Study:

  • To design and investigate a novel double-layered separator for lithium-sulfur batteries.
  • To suppress polysulfide shuttling and enhance electrochemical performance.
  • To improve the overall efficiency and longevity of lithium-sulfur cells.

Main Methods:

  • Fabrication of a double-layered separator combining a polypropylene (PP) matrix and poly(methyl methacrylate) (PMMA) microsphere layer.
  • Electrochemical testing of sulfur positive electrodes with the novel PP/PMMA separator and a standard PP separator.
  • Analysis of capacity, Coulombic efficiency, and polysulfide inhibition mechanisms.

Main Results:

  • The PP/PMMA separator achieved a high initial capacity of 1100.10 mAh g-1 at 0.1 mA cm-2, exceeding the standard PP separator's 948.60 mAh g-1.
  • The arrayed PMMA microspheres effectively inhibited polysulfide diffusion via physical and chemical adsorption.
  • Enhanced electrolyte affinity and accelerated lithium-ion diffusion were observed with the PMMA microspheres.

Conclusions:

  • The developed double-layered PP/PMMA separator significantly suppresses polysulfide shuttling in lithium-sulfur batteries.
  • This separator design leads to superior electrochemical performance, including higher capacity and efficiency.
  • The findings highlight the potential of engineered separators for advancing lithium-sulfur battery technology.