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<p>Due to the low cost and abundant reserves of sodium, sodium ion batteries (SIBs) have emerged as a promising alternative to lithium ion batteries (LIBs), attracting significant global research interest. Among the anode materials for SIBs, transition metal sulfides (TMSs) are particularly notable for their high specific capacity and low cost. However, TMSs as anode materials for SIBs experience significant volume expansion, resulting in severe capacity fade. Herein, FeS/MoS₂@C composites were fabricated by electrospinning-calcination and sulfurization method. The FeS/MoS₂ composites with varying molar ratio of FeS and MoS₂ and carbon fibers formed from the carbonization of polyacrylonitrile (PAN) during electrospinning-calcination process. The as-prepared FeS/MoS₂@C composites take on coaxial-like fibre morphology. The FeS/MoS₂@C composites behave higher capacity and better cycling stability, compared with FeS@C and MoS<sub>2</sub>@C composites. These results are attributed to the high specific capacity of FeS, the unique layered structure of MoS₂, and the enhanced conductivity of carbon network. Among these composites, the FeS/MoS₂@C-4 composite (the molar ratio of FeS and MoS<sub>2</sub> is 6:4) exhibits best electrochemical performance. It retains discharge capacity of 200.3 mAh·g<sup>− 1</sup> at 1&#xa0;A·g<sup>− 1</sup> after 500 cycles. The composite strategy of TMSs and the synthesis approach can effectively enhance the electrochemical properties of TMSs with the potential as high capacity anode for SIBs.</p>

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Preparation of coaxial-like FeS/MoS2@C composites by electrospinning-calcination method for improved sodium storage performance

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Fangfang Xu,
  • Junxuan Zhou,
  • Hao Zhang,
  • Ru’an Chi,
  • Jianwen Liu,
  • Shiquan Wang,
  • Lin Li

摘要

Due to the low cost and abundant reserves of sodium, sodium ion batteries (SIBs) have emerged as a promising alternative to lithium ion batteries (LIBs), attracting significant global research interest. Among the anode materials for SIBs, transition metal sulfides (TMSs) are particularly notable for their high specific capacity and low cost. However, TMSs as anode materials for SIBs experience significant volume expansion, resulting in severe capacity fade. Herein, FeS/MoS₂@C composites were fabricated by electrospinning-calcination and sulfurization method. The FeS/MoS₂ composites with varying molar ratio of FeS and MoS₂ and carbon fibers formed from the carbonization of polyacrylonitrile (PAN) during electrospinning-calcination process. The as-prepared FeS/MoS₂@C composites take on coaxial-like fibre morphology. The FeS/MoS₂@C composites behave higher capacity and better cycling stability, compared with FeS@C and MoS2@C composites. These results are attributed to the high specific capacity of FeS, the unique layered structure of MoS₂, and the enhanced conductivity of carbon network. Among these composites, the FeS/MoS₂@C-4 composite (the molar ratio of FeS and MoS2 is 6:4) exhibits best electrochemical performance. It retains discharge capacity of 200.3 mAh·g− 1 at 1 A·g− 1 after 500 cycles. The composite strategy of TMSs and the synthesis approach can effectively enhance the electrochemical properties of TMSs with the potential as high capacity anode for SIBs.