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<p>Lithium-sulfur (Li-S) batteries offer substantial potential as next-generation energy storage solutions, driven by their high theoretical energy density and low material cost. However, the practical realization and commercialization of these batteries face major challenges, primarily the detrimental polysulfide shuttle effect and the slow kinetics associated with sulfur redox reactions. To address these challenges, we developed a rational structural design of Bi₂S₃₋ₓSeₓ/CNTs heterostructures as advanced sulfur hosts via a solvothermal synthesis strategy. The three-dimensional carbon nanotube (CNT) framework establishes interconnected conductive pathways for rapid electron/ion transport, while the synergistic integration of Bi₂S₃ and controlled Se doping creates abundant catalytic active sites. This dual modification effectively lowers the energy barrier for LiPS conversion and suppresses the shuttle effect through enhanced chemisorption-catalysis coupling. Electrochemical evaluations demonstrate that the optimized CNTs-Bi<sub>2</sub>S<sub>3</sub>₋<sub>x</sub>Se<sub>x</sub>-1/S cathode delivers a high-rate capacity of 900 mAh g⁻¹ at 2&#xa0;C and retains 1139.1 mAh g⁻¹ after 200 cycles at 0.2&#xa0;C, corresponding to an exceptional capacity retention of 87.7%. This work provides new insights into the rational design of multifunctional sulfur host materials, paving the way for high-energy-density Li-S batteries with enhanced cycling stability and reaction efficiency.</p>

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Synergistic enhancement of lithium polysulfide conversion in high-performance lithium-sulfur batteries via Bi2S3 incorporation and selenium doping

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Wenxiao Su,
  • Wangjun J. Feng,
  • Yueping Niu,
  • Qi Zhou,
  • Zhifeng Zhao,
  • Li Zhang

摘要

Lithium-sulfur (Li-S) batteries offer substantial potential as next-generation energy storage solutions, driven by their high theoretical energy density and low material cost. However, the practical realization and commercialization of these batteries face major challenges, primarily the detrimental polysulfide shuttle effect and the slow kinetics associated with sulfur redox reactions. To address these challenges, we developed a rational structural design of Bi₂S₃₋ₓSeₓ/CNTs heterostructures as advanced sulfur hosts via a solvothermal synthesis strategy. The three-dimensional carbon nanotube (CNT) framework establishes interconnected conductive pathways for rapid electron/ion transport, while the synergistic integration of Bi₂S₃ and controlled Se doping creates abundant catalytic active sites. This dual modification effectively lowers the energy barrier for LiPS conversion and suppresses the shuttle effect through enhanced chemisorption-catalysis coupling. Electrochemical evaluations demonstrate that the optimized CNTs-Bi2S3₋xSex-1/S cathode delivers a high-rate capacity of 900 mAh g⁻¹ at 2 C and retains 1139.1 mAh g⁻¹ after 200 cycles at 0.2 C, corresponding to an exceptional capacity retention of 87.7%. This work provides new insights into the rational design of multifunctional sulfur host materials, paving the way for high-energy-density Li-S batteries with enhanced cycling stability and reaction efficiency.