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<p>Sodium-ion batteries (SIBs) have been regarded as a promising alternative to lithium-ion batteries (LIBs), due to the greater abundance of sodium compared to lithium in the earth’s crust and its lower mining costs. However, the SIBs undergo several challenges, such as multiphase reactions, poor cycling stability, and low energy density during charge and discharge cycles. A novel composite of selenide and carbon nanotube (CoSe/CNT) has been successfully constructed and systematically researched in this work. The resulting composite demonstrates excellent electronic conductivity, superior chemical stability, and remarkable catalytic activity. These properties work synergistically to reduce the activation energy barrier for electrochemical reactions and suppress undesirable phase transitions, thereby accelerating the charge transfer kinetics and improving the utilization efficiency of active material. As a result, the composite material significantly enhances the energy density, cycle life, and overall performance of SIBs. Specifically, when used as anode materials in SIBs, the CoSe/CNT composites retain a discharge-specific capacity of 161 mAh g<sup><b>–</b>1</sup> after 300 cycles at a high charge/discharge rate of 2 A g<sup><b>–</b>1</sup>, with a minimal cycle-to-cycle capacity decay of just 0.13%. This highlights the excellent cycle stability and long cycle life of CoSe/CNT composites. In conclusion, CoSe/CNT composites hold considerable promise for advancing the performance of SIBs.</p>

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High capacitive sodium-ion storage in CoSe/CNT porous network

  • 期刊论文

  • 发表日期：

    2025年3月22日

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  • Kun Xie,
  • Xiaoyu Wang,
  • Chenxu Tian,
  • Hui Cheng,
  • Yuxin Li,
  • Xianfa Ma,
  • Min Gu,
  • Hui Yang,
  • Xiujing Lin,
  • Ruiqing Liu

摘要

Sodium-ion batteries (SIBs) have been regarded as a promising alternative to lithium-ion batteries (LIBs), due to the greater abundance of sodium compared to lithium in the earth’s crust and its lower mining costs. However, the SIBs undergo several challenges, such as multiphase reactions, poor cycling stability, and low energy density during charge and discharge cycles. A novel composite of selenide and carbon nanotube (CoSe/CNT) has been successfully constructed and systematically researched in this work. The resulting composite demonstrates excellent electronic conductivity, superior chemical stability, and remarkable catalytic activity. These properties work synergistically to reduce the activation energy barrier for electrochemical reactions and suppress undesirable phase transitions, thereby accelerating the charge transfer kinetics and improving the utilization efficiency of active material. As a result, the composite material significantly enhances the energy density, cycle life, and overall performance of SIBs. Specifically, when used as anode materials in SIBs, the CoSe/CNT composites retain a discharge-specific capacity of 161 mAh g–1 after 300 cycles at a high charge/discharge rate of 2 A g–1, with a minimal cycle-to-cycle capacity decay of just 0.13%. This highlights the excellent cycle stability and long cycle life of CoSe/CNT composites. In conclusion, CoSe/CNT composites hold considerable promise for advancing the performance of SIBs.