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<p>Lithium-sulfur (Li–S) battery is a promising candidate for next-generation energy storage systems. However, the practical application of Li–S batteries is hindered by the shuttle effect of lithium polysulfides (LiPSs). Herein, we developed a novel synthesis strategy to construct Co<sub>2</sub>N/CoO heterostructures anchored on an N, S-codoped three-dimensional carbon network (denoted as S@N, S-3DC-Co<sub>2</sub>N/CoO). Systematic characterization reveals that the Co<sub>2</sub>N/CoO heterostructures synergistically anchor LiPSs while catalytically promote the conversion from Li<sub>2</sub>S<sub>4</sub> to Li<sub>2</sub>S. Microscopic analysis demonstrated that Co<sub>2</sub>N/CoO heterostructures are embedded in the pores formed on the 3DC surface after CoSO<sub>4</sub> reduction, with the remaining void space effectively accommodating storage space for sulfur. This hierarchical architecture ensures intimate contact between sulfur species and catalytic heterostructures, thereby enhancing the utilization of active material. The S@N, S-3DC-Co<sub>2</sub>N/CoO cathode delivered an initial discharge capacity of 1135&#xa0;mAh&#xa0;g<sup>−1</sup> at 1&#xa0;C, with a low decay rate of 0.051% per cycle over 1000 cycles. This work provides a novel synthesis strategy to construct heterostructures for application in Li–S batteries and catalysis fields.</p>

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High active sites Co2N/CoO heterostructures supported on 3D N, S-doped porous carbon as a multifunction host for lithium–sulfur batteries

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Ning Wang,
  • Yujie Wang,
  • Chunsheng Shi,
  • Yue Li,
  • Rui Zhang,
  • Xingai Wang,
  • Haichang Zhang,
  • Fei Ding

摘要

Lithium-sulfur (Li–S) battery is a promising candidate for next-generation energy storage systems. However, the practical application of Li–S batteries is hindered by the shuttle effect of lithium polysulfides (LiPSs). Herein, we developed a novel synthesis strategy to construct Co2N/CoO heterostructures anchored on an N, S-codoped three-dimensional carbon network (denoted as S@N, S-3DC-Co2N/CoO). Systematic characterization reveals that the Co2N/CoO heterostructures synergistically anchor LiPSs while catalytically promote the conversion from Li2S4 to Li2S. Microscopic analysis demonstrated that Co2N/CoO heterostructures are embedded in the pores formed on the 3DC surface after CoSO4 reduction, with the remaining void space effectively accommodating storage space for sulfur. This hierarchical architecture ensures intimate contact between sulfur species and catalytic heterostructures, thereby enhancing the utilization of active material. The S@N, S-3DC-Co2N/CoO cathode delivered an initial discharge capacity of 1135 mAh g−1 at 1 C, with a low decay rate of 0.051% per cycle over 1000 cycles. This work provides a novel synthesis strategy to construct heterostructures for application in Li–S batteries and catalysis fields.