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Engineering Triple-Phase Interfaces Enabled by Layered Double Perovskite Oxide for Boosting Polysulfide Redox

Zhe Bai1, Zhenhua Wang1, Ruilong Li1

  • 1Beijing Key Laboratory of Chemical Power Source and Green Catalysis, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

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Summary

Engineered PrBaCo2O5+δ (PBCO) perovskite enhances lithium-sulfur battery performance by creating more triple-phase interfaces (TPIs) for efficient polysulfide conversion, leading to stable, high-capacity energy storage.

Keywords:
layered double perovskite oxidelithium−sulfur batteriesoxygen vacanciesredox kineticstriple-phase interface

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Polysulfide conversion is key for lithium-sulfur (Li-S) batteries, occurring at triple-phase interfaces (TPIs).
  • Conventional transition metal oxides have poor electrical conductivity, limiting TPIs and electrocatalytic efficiency.

Purpose of the Study:

  • To develop a novel electrocatalyst for boosting polysulfide conversion in Li-S batteries.
  • To engineer TPIs using a superior electrically conductive material.

Main Methods:

  • Fabrication and characterization of layered double perovskite PrBaCo2O5+δ (PBCO).
  • Density Functional Theory (DFT) calculations and in situ Raman spectroscopy to investigate electrocatalytic mechanisms.
  • Assembly and testing of PBCO-based Li-S batteries.

Main Results:

  • PBCO exhibits superior electrical conductivity and enriched oxygen vacancies, expanding TPIs to the entire surface.
  • DFT and Raman spectroscopy confirmed PBCO's electrocatalytic effect and the importance of enhanced conductivity.
  • PBCO-based Li-S batteries achieved a reversible capacity of 612 mAh g⁻¹ after 500 cycles at 1.0 C with a low capacity fading rate of 0.067% per cycle.

Conclusions:

  • The TPI engineering approach using conductive PBCO effectively enhances polysulfide conversion in Li-S batteries.
  • Enhanced electrical conductivity is critical for maximizing TPIs and electrocatalytic performance.
  • This study offers insights into designing advanced catalysts for high-performance Li-S batteries.