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In-Situ Grafting Strategy Enables Functional Separator for Advanced Lithium-Sulfur Batteries.

Wen-Jun Yi1, Bo Niu1, Huamin Hu1

  • 1College of Materials Science and Engineering, Changsha University of Science &Technology, Changsha, Hunan, 410082, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|December 18, 2024
PubMed
Summary

A novel functional separator for lithium-sulfur batteries was created by grafting nickel tetraaminophthalocyanine (NiTAPc) onto polypropylene (PP). This modification effectively inhibits polysulfide shuttle, enhancing battery stability and performance.

Keywords:
PP‐NiTAPclithium‐sulfur batteriesmodified separatornickel phthalocyanineshuttle effect

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Lithium-sulfur (Li-S) batteries offer high theoretical energy density but suffer from polysulfide shuttle.
  • Existing separators lack efficient mechanisms to suppress polysulfide migration.

Purpose of the Study:

  • To develop a functional separator that inhibits polysulfide shuttle in Li-S batteries.
  • To enhance the catalytic activity and stability of battery components.

Main Methods:

  • In-situ grafting of nickel tetraaminophthalocyanine (NiTAPc) onto polypropylene (PP) separators.
  • Characterization of the modified separator's morphology and chemical properties.
  • Electrochemical testing of Li-S batteries with the modified separator.
  • Theoretical calculations to understand polysulfide interaction.

Main Results:

  • NiTAPc was uniformly grafted onto the PP separator, mitigating self-agglomeration and exposing active Ni-N4 sites.
  • These sites demonstrated excellent adsorption and conversion of polysulfides.
  • Li-S batteries with PP-NiTAPc separators showed high initial capacity (1256.5 mAh g⁻¹) and excellent cycle stability (582.4 mAh g⁻¹ after 500 cycles at 1 C).

Conclusions:

  • The in-situ grafting strategy effectively suppresses the polysulfide shuttle effect in Li-S batteries.
  • The developed PP-NiTAPc separator significantly improves cycle stability and performance.
  • This approach provides insights for designing advanced separators for rechargeable batteries.