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<p>Lithium-sulfur (Li-S) batteries have attracted considerable interest because of their high energy density. However, the poor conductivity of sulfur and discharge product, lithium sulfide (Li<sub>2</sub>S), coupled with the diffusion of lithium polysulfides (LiPSs), has long hindered their development. Herein, we propose a dual-functional nitrogen-doped carbon nanofiber (N-CNFs) interlayer, which not only suppresses the diffusion of LiPSs and enhances sulfur conversion kinetics but also effectively regulates lithium ion transport and deposition behavior. This approach mitigates side reactions between LiPSs and the lithium (Li) anode, as well as suppresses Li dendrite. As a result, the assembled Li-Li symmetric cell demonstrated stable cycling for 600&#xa0;h under a current density of 1&#xa0;mA cm<sup>− 2</sup> with 1 mAh cm<sup>− 2</sup>. Li-S batteries with this N-CNFs interlayer retained a specific capacity of 733.8 mAh g<sup>− 1</sup> after 100 cycles at 0.1&#xa0;C, with a capacity retention rate of 82.72%. At 1&#xa0;C, after 600 cycles, the battery still exhibited a specific capacity of 401.0 mAh g<sup>− 1</sup>. This N-CNFs interlayer structure not only offers a promising solution for interlayers in Li-S batteries but also highlights the potential of electrospinning in battery technology.</p>

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Dual-functional nitrogen-doped interlayer structure design to enhance the cycling stability of lithium-sulfur batteries

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Hong Wu,
  • Teng Deng,
  • Laitao Qu,
  • Yang Shi,
  • Xinliang Men,
  • Lin Huang,
  • Juan Wang

摘要

Lithium-sulfur (Li-S) batteries have attracted considerable interest because of their high energy density. However, the poor conductivity of sulfur and discharge product, lithium sulfide (Li2S), coupled with the diffusion of lithium polysulfides (LiPSs), has long hindered their development. Herein, we propose a dual-functional nitrogen-doped carbon nanofiber (N-CNFs) interlayer, which not only suppresses the diffusion of LiPSs and enhances sulfur conversion kinetics but also effectively regulates lithium ion transport and deposition behavior. This approach mitigates side reactions between LiPSs and the lithium (Li) anode, as well as suppresses Li dendrite. As a result, the assembled Li-Li symmetric cell demonstrated stable cycling for 600 h under a current density of 1 mA cm− 2 with 1 mAh cm− 2. Li-S batteries with this N-CNFs interlayer retained a specific capacity of 733.8 mAh g− 1 after 100 cycles at 0.1 C, with a capacity retention rate of 82.72%. At 1 C, after 600 cycles, the battery still exhibited a specific capacity of 401.0 mAh g− 1. This N-CNFs interlayer structure not only offers a promising solution for interlayers in Li-S batteries but also highlights the potential of electrospinning in battery technology.