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N/O-doped porous carbon matrix for improved potassium-selenium battery cathode in different electrolyte systems

  • 编号:
    FE37D93F322144646B2C661A89EF04F8
  • 作者:
  • 语种:
    英文
  • 期刊:
    JOURNAL OF ALLOYS AND COMPOUNDS ISSN:0925-8388 2023 年 930 卷 ; JAN 5
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  • 摘要:

    Combining the high abundance of potassium (K) in the Earth''s crust and the high theoretical energy density of selenium (Se), a potassium-selenium (K-Se) battery is attractive as an alternative energy storage system. However, some urgent issues still need to be solved to obtain efficient selenium-based cathodes, such as the shuttle effect of high-order selenides in electrolytes and volume expansion during the redox process. Herein, we report Se/heteroatoms (N and O) dual-doped hierarchical porous carbon (Se/HHPC) composite as cathode material for the K-Se battery. The hierarchical porous carbon frameworks not only provide storage and ex-pansion buffer space for Se-based cathode material, but also facilitate the penetration of the electrolyte, which effectively improves the cell''s electrical conductivity. In addition, the dual-doped heteroatoms enhance the interaction between potassium selenide and carbon host. When tested for K-ion batteries with carbonate electrolytes, Se/HHPC cathode exhibits a relatively high electrochemical performance (228 mAh g-1, 200 cycles, 0.2 C) under the synergy of space bondage and chemisorption. The electrode could deliver a rate capability of 295 mAh g-1 at 4 C. Furthermore, the hybrid cathode also exhibits excellent properties in ether electrolytes and has a reversible capacity of 236 mA h g-1 at 0.2 C after 300 cycles and a rate capability of 234 mAh g-1 at 4 C.(c) 2022 Elsevier B.V. All rights reserved.

  • 推荐引用方式
    GB/T 7714:
    Zhao Xiaosen,Wang Daguang,Qi Hui, et al. N/O-doped porous carbon matrix for improved potassium-selenium battery cathode in different electrolyte systems [J].JOURNAL OF ALLOYS AND COMPOUNDS,2023,930.
  • APA:
    Zhao Xiaosen,Wang Daguang,Qi Hui,Li Zhenjiang,&Yue Huijuan.(2023).N/O-doped porous carbon matrix for improved potassium-selenium battery cathode in different electrolyte systems .JOURNAL OF ALLOYS AND COMPOUNDS,930.
  • MLA:
    Zhao Xiaosen, et al. "N/O-doped porous carbon matrix for improved potassium-selenium battery cathode in different electrolyte systems" .JOURNAL OF ALLOYS AND COMPOUNDS 930(2023).
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