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<p>With the continuous development of new energy storage technologies, the graphite anode used in lithium-ion battery anode materials has approached its theoretical specific capacity. The search for anode materials with higher specific capacity has received widespread attention. High-entropy alloy is a new type of material with excellent properties, such as its excellent mechanical properties and thermal stability. Compared with bielemental metal materials, the synergistic action of various elements in high-entropy alloys can effectively improve the lithium/potassium storage efficiency of the materials. In this work, Co<sub>0.2</sub>Sb<sub>0.2</sub>Fe<sub>0.2</sub>Mn<sub>0.2</sub>Ni<sub>0.2</sub> high-entropy alloy carbon nanofiber (HEA-CNFs) used as electrode for lithium/potassium ion batteries (L/PIBs) showed an ultra-high specific capacity of 1400&#xa0;mAh&#xa0;g<sup>−1</sup> after 800 cycles at 0.5 A&#xa0;g<sup>−1</sup>. Besides, as a self-supporting PIBs anode, HEA-CNFs showed a reversible capacity of 280&#xa0;mAh&#xa0;g<sup>−1</sup> after 200 cycles at a current density of 0.2 A&#xa0;g<sup>−1</sup>, revealing the huge potential of potassium storage. Compared with Co<sub>0.5</sub>Sb<sub>0.5</sub> carbon nanofiber, HEA-CNFS can obtain better electrochemical properties. The high-entropy structure is conducive to improving the diffusion rate of lithium/potassium ion, enhancing the specific discharge capacity and cycle stability of the material. This work provides guidance for the preparation and development of high-entropy materials.</p>

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Co0.2Sb0.2Fe0.2Mn0.2Ni0.2 high-entropy alloy carbon nanofiber as anode for lithium/potassium ion batteries

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Duyu Zheng,
  • Juxing Zha,
  • Yuanshuang Wang,
  • Zhengang Wei,
  • Jiqiu Qi,
  • Fuxiang Wei,
  • Qingkun Meng,
  • Xiaolan Xue,
  • Danyang Zhao,
  • Yongzhi Li,
  • Qing Yin,
  • Yanwei Sui,
  • Bin Xiao

摘要

With the continuous development of new energy storage technologies, the graphite anode used in lithium-ion battery anode materials has approached its theoretical specific capacity. The search for anode materials with higher specific capacity has received widespread attention. High-entropy alloy is a new type of material with excellent properties, such as its excellent mechanical properties and thermal stability. Compared with bielemental metal materials, the synergistic action of various elements in high-entropy alloys can effectively improve the lithium/potassium storage efficiency of the materials. In this work, Co0.2Sb0.2Fe0.2Mn0.2Ni0.2 high-entropy alloy carbon nanofiber (HEA-CNFs) used as electrode for lithium/potassium ion batteries (L/PIBs) showed an ultra-high specific capacity of 1400 mAh g−1 after 800 cycles at 0.5 A g−1. Besides, as a self-supporting PIBs anode, HEA-CNFs showed a reversible capacity of 280 mAh g−1 after 200 cycles at a current density of 0.2 A g−1, revealing the huge potential of potassium storage. Compared with Co0.5Sb0.5 carbon nanofiber, HEA-CNFS can obtain better electrochemical properties. The high-entropy structure is conducive to improving the diffusion rate of lithium/potassium ion, enhancing the specific discharge capacity and cycle stability of the material. This work provides guidance for the preparation and development of high-entropy materials.