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In Situ Polymerization of Ultra-Thin and Defect-Free Polyamide Layer for Effectively Impeding the Polysulfides

Aqian Zheng1, Chunli Shen1, Kaijian Yan1

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Researchers developed a novel, defect-free polyamide layer for lithium-sulfur (Li-S) battery separators. This thin layer effectively prevents polysulfide shuttling, significantly improving battery stability and lifespan for high-energy applications.

Keywords:
defect‐freepolyamidepolysulfidesseparatorultra‐thin

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-sulfur (Li-S) batteries offer high energy density but face challenges like polysulfide shuttle and Li-dendrite growth.
  • Existing separators have particle gaps that facilitate polysulfide migration, hindering performance.

Purpose of the Study:

  • To synthesize a nanoscale, defect-free cross-linked polyamide (PA) layer on polypropylene (PP) separators.
  • To enhance the stability and cycle life of Li-S batteries by mitigating polysulfide shuttling.

Main Methods:

  • In situ polymerization to create a 1.5 nm thin PA modification layer on PP separators.
  • Cyclic voltammetry (CV) and time-of-flight (TOF) testing to evaluate polysulfide diffusion.
  • Assembly and cycling of Li/Li symmetric batteries and Li-S batteries with the modified separators.

Main Results:

  • The PA layer effectively impeded polysulfide diffusion.
  • Li/Li symmetric batteries showed a low overpotential (12 mV after 1000 h at 1 mA cm⁻²).
  • Li-S batteries exhibited a low capacity degradation rate (0.06% per cycle over 450 cycles at 1 C) and retained 87.63% capacity after 50 cycles in a pouch cell.

Conclusions:

  • The defect-free PA layer significantly enhances Li-S battery performance by suppressing polysulfide shuttling.
  • This approach advances separator modification for improved Li-S battery applications.
  • The study encourages further research into defect-free separator modifications for next-generation batteries.