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<p>Developing effective heterostructure strategies to mitigate the shuttling effect and accelerate lithium polysulfide (LiPS) conversion remains a critical challenge in lithium–sulfur (Li–S) batteries. Here, we report the first carbon–free VO<sub>2</sub>–VS<sub>2</sub> heterostructure material synthesized via in situ sulfurization, applied as a modifier on a commercial polypropylene (PP) separator (denoted as VO<sub>2</sub>–VS<sub>2</sub>@PP). The as–prepared VO<sub>2</sub>–VS<sub>2</sub> nanorods synergistically combine the high absorptivity of VO<sub>2</sub> with the efficient catalytic properties of VS<sub>2</sub>, simultaneously enhancing LiPS anchoring and promoting its conversion. We systematically investigate the influence of material composition on battery performance, leveraging these functional attributes, Li–S cells incorporating VO<sub>2</sub>–VS<sub>2</sub>@PP exhibit exceptional cycle stability (over 500 cycles at 1C), impressive rate performance (807 mAh·g<sup>–1</sup> at 5C), desirable reversibility (49.9% capacity retention after 300 cycles at 5C) and exceptional pouch cell performance (3.65 mAh·cm<sup>–2</sup> after 50 stable cycles at 0.1C). This study underscores the potential of tailored heterostructures in realizing high–performance Li–S batteries, offering new insights for next–generation energy storage solutions.</p> Graphical abstract <p></p>

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Effective polysulfides regulation in high-performance Li–S batteries via novel VO2–VS2 heterostructure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月28日

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  • Yao-Lin Hou,
  • Yu-Qing Zhang,
  • Dan Li,
  • Hai-Ming Xie,
  • Jia Liu,
  • Yu-Long Liu,
  • Jie-Fang Zhu

摘要

Developing effective heterostructure strategies to mitigate the shuttling effect and accelerate lithium polysulfide (LiPS) conversion remains a critical challenge in lithium–sulfur (Li–S) batteries. Here, we report the first carbon–free VO2–VS2 heterostructure material synthesized via in situ sulfurization, applied as a modifier on a commercial polypropylene (PP) separator (denoted as VO2–VS2@PP). The as–prepared VO2–VS2 nanorods synergistically combine the high absorptivity of VO2 with the efficient catalytic properties of VS2, simultaneously enhancing LiPS anchoring and promoting its conversion. We systematically investigate the influence of material composition on battery performance, leveraging these functional attributes, Li–S cells incorporating VO2–VS2@PP exhibit exceptional cycle stability (over 500 cycles at 1C), impressive rate performance (807 mAh·g–1 at 5C), desirable reversibility (49.9% capacity retention after 300 cycles at 5C) and exceptional pouch cell performance (3.65 mAh·cm–2 after 50 stable cycles at 0.1C). This study underscores the potential of tailored heterostructures in realizing high–performance Li–S batteries, offering new insights for next–generation energy storage solutions.

Graphical abstract