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<p>Lithium-sulfur batteries offer high theoretical energy density (2567&#xa0;Wh&#xa0;kg<sup>−1</sup>) but suffer from the polysulfide shuttle effect. This study introduces a high-entropy ceramic, Li<sub>0.3</sub>(Mg<sub>0.2</sub>Co<sub>0.2</sub>Ni<sub>0.2</sub>Cu<sub>0.2</sub>Zn<sub>0.2</sub>)<sub>0.85</sub>O (LMCNCZO), synthesized via sol–gel and calcination and employed as a functional separator coating. Benefiting from its multi-element synergistic effect, the LMCNCZO coating, positioned adjacent to the cathode side, effectively immobilizes polysulfides through combined physical confinement and strong chemical interactions. The modified separator assembled cells deliver improved capacity of 991&#xa0;mAh&#xa0;g<sup>−1</sup> after 100 cycles (0.2 C) and exhibit minimal capacity fade over 500 and 1000 cycles at 1 C (0.1%) and 2 C (0.05%), respectively, along with reduced polarization and improved redox kinetics.</p>

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Study on the sulfur fixation mechanism of high-entropy ceramic Li0.3(Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)0.85O for lithium–sulfur batteries

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Kailong Zhang,
  • Zhen Ding,
  • Pengju Zhao,
  • Luanhui Wu,
  • Haowen Mou,
  • Yazhou Kong,
  • Guang Hu,
  • Weiwei Hu,
  • Liangbiao Wang,
  • Mingwei Chen

摘要

Lithium-sulfur batteries offer high theoretical energy density (2567 Wh kg−1) but suffer from the polysulfide shuttle effect. This study introduces a high-entropy ceramic, Li0.3(Mg0.2Co0.2Ni0.2Cu0.2Zn0.2)0.85O (LMCNCZO), synthesized via sol–gel and calcination and employed as a functional separator coating. Benefiting from its multi-element synergistic effect, the LMCNCZO coating, positioned adjacent to the cathode side, effectively immobilizes polysulfides through combined physical confinement and strong chemical interactions. The modified separator assembled cells deliver improved capacity of 991 mAh g−1 after 100 cycles (0.2 C) and exhibit minimal capacity fade over 500 and 1000 cycles at 1 C (0.1%) and 2 C (0.05%), respectively, along with reduced polarization and improved redox kinetics.