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<p>Lithium-sulfur batteries are promising due to their high energy density, but the shuttle effect of lithium polysulfides (LiPS) limits their performance. In this study, PbTiO<sub>3</sub>@Au (PTO@Au) composites were designed to enhance LiPS conversion through spontaneous polarization and surface catalysis. The incorporation of 3 wt% PTO@Au-1.0 in the sulfur cathode significantly improved reaction kinetics, reduced polarization, and suppressed the shuttle effect. This configuration achieved an initial capacity of 572.1 mAh·g<sup>−1</sup> at 200&#xa0;mA·g<sup>−1</sup> and retained 405.7 mAh·g<sup>−1</sup> at 900&#xa0;mA·g<sup>−1</sup>, with a 92.8% capacity retention after 100 cycles. The results, supported by transient photovoltage (TPV) and electrochemical impedance spectroscopy (EIS), demonstrate that combining spontaneous polarization and catalytic action can overcome key challenges in Li-S batteries, offering a promising strategy for improving their performance.</p>

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Leveraging spontaneous polarization and catalysis: PbTiO3@Au composites for suppressing the LiPS shuttle effect in lithium-sulfur batteries

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Chun-Ying Chao,
  • Long-Yang Zhang,
  • Jing-Qi Wang,
  • Pin-Jiang Li,
  • Hong-Wei Yue,
  • Li-Jun Wu,
  • Hao Li

摘要

Lithium-sulfur batteries are promising due to their high energy density, but the shuttle effect of lithium polysulfides (LiPS) limits their performance. In this study, PbTiO3@Au (PTO@Au) composites were designed to enhance LiPS conversion through spontaneous polarization and surface catalysis. The incorporation of 3 wt% PTO@Au-1.0 in the sulfur cathode significantly improved reaction kinetics, reduced polarization, and suppressed the shuttle effect. This configuration achieved an initial capacity of 572.1 mAh·g−1 at 200 mA·g−1 and retained 405.7 mAh·g−1 at 900 mA·g−1, with a 92.8% capacity retention after 100 cycles. The results, supported by transient photovoltage (TPV) and electrochemical impedance spectroscopy (EIS), demonstrate that combining spontaneous polarization and catalytic action can overcome key challenges in Li-S batteries, offering a promising strategy for improving their performance.