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Lithium-sulfur (Li-S) batteries are considered as promising candidates for next-generation energy storage systems due to the high theoretical capacity of sulfur (1675 mAh g−1). However, their practical application is significantly hindered by the inherent low electrical conductivity of sulfur and the shuttle effect caused by soluble polysulfides. To address these challenges, this study reports the development of a lithium-enriched solid polymer electrolyte (SPE) based on polyethylene oxide (PEO)/polyvinylpyrrolidone (PVP) composite, which functions as both the electrolyte and separator in the assembled All-Solid-State Li-S cell (ASSLi-S). The incorporation of PVP enhances ionic conductivity by disrupting the crystallinity of PEO and promoting a more amorphous and conductive polymer matrix. Electrochemical characterizations were done on the ASSLi -S cell assembled using the modified sulfur cathode and the SPE. The PEO/PVP-based SPE acts as an effective physical barrier against polysulfide migration, thereby mitigating shuttle-related losses. The assembled ASSLi-S cells demonstrate enhanced specific capacity and excellent cycling stability, highlighting the potential of this composite SPE for high-performance lithium-sulfur battery applications. Assembled half cells with modified sulfur cathode and SPE deliver an initial discharge capacity of 805.19 mAh g−1 at 0.1 C rate.

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All Solid-State Li-S Cells with PEO/PVP Based Solid Polymer Electrolyte

  • 会议论文

  • 发表日期：

    2025年

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  • Sreeja Ezhumayil Muraleedharan,
  • Neethu Simon,
  • Vineeth Mohanan Parakkat,
  • S. Jayalekshmi

摘要

Lithium-sulfur (Li-S) batteries are considered as promising candidates for next-generation energy storage systems due to the high theoretical capacity of sulfur (1675 mAh g−1). However, their practical application is significantly hindered by the inherent low electrical conductivity of sulfur and the shuttle effect caused by soluble polysulfides. To address these challenges, this study reports the development of a lithium-enriched solid polymer electrolyte (SPE) based on polyethylene oxide (PEO)/polyvinylpyrrolidone (PVP) composite, which functions as both the electrolyte and separator in the assembled All-Solid-State Li-S cell (ASSLi-S). The incorporation of PVP enhances ionic conductivity by disrupting the crystallinity of PEO and promoting a more amorphous and conductive polymer matrix. Electrochemical characterizations were done on the ASSLi -S cell assembled using the modified sulfur cathode and the SPE. The PEO/PVP-based SPE acts as an effective physical barrier against polysulfide migration, thereby mitigating shuttle-related losses. The assembled ASSLi-S cells demonstrate enhanced specific capacity and excellent cycling stability, highlighting the potential of this composite SPE for high-performance lithium-sulfur battery applications. Assembled half cells with modified sulfur cathode and SPE deliver an initial discharge capacity of 805.19 mAh g−1 at 0.1 C rate.