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首页> 外文期刊>Advanced Functional Materials >Boosting Coulombic Efficiency of Conversion-Reaction Anodes for Potassium-Ion Batteries via Confinement Effect
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Boosting Coulombic Efficiency of Conversion-Reaction Anodes for Potassium-Ion Batteries via Confinement Effect

机译：通过限制效果提高转化反应阳极的Coulombic效率

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摘要

Potassium-ion battery anode materials with high capacity always hold one or more K ions and are companied by large volume swelling, which threatens the stability of solid-electrolyte-interface (SEI) layers, and results in low coulombic efficiency as well as inferior cycling stability. Herein, an avenue that induces the rapid formation of continuous SEI layers by the confinement effect to boost K ions storage property is proposed. CuS nanoplates are dispersed on the core layer of carbon nanofibers and further confined by the Nb2O5-C shell layer, constructing core-shell structure CuS-C@Nb2O5-C nanofibers (NFs). The shell layer protects the CuS nanoplates from immediate contact with the electrolyte and brings about volume expansion, assisting the rapid formation of continuous SEI layers. As a result, the capacity retention of the CuS-C@Nb2O5-C NFs electrode remains at 93.1% after 100 cycles, much larger than that of the CuS-C NF electrode (74.6%); the process that coulombic efficiency stabilized above 99.0% shortens to 5 cycles from 30 cycles. This progress is also found in the CoS2-C@Nb2O5-C and NiS2-C@Nb2O5-C NFs electrodes. The improved coulombic efficiency and cycling stability brought about by the confinement effect offer a facile approach to boost the K ion storage property of conversion reaction anodes.
机译：具有高容量的钾离子电池阳极材料总是保持一个或多个k离子，并伴随着大体积溶胀，这威胁着固体电解质界面（SEI）层的稳定性，并导致低库仑效率以及劣质循环稳定。在此，提出了一种通过限制效果引起连续SEI层的快速形成的大道，以提高K离子储存性能。 CUS纳米板分散在碳纳米纤维的芯层上，并由Nb2O5-C壳层进一步限制，构建核 - 壳结构CUS-C-C 1 NB2O5-C纳米纤维（NFS）。壳层保护CUS纳米板与电解质立即接触并带来大约体积膨胀，辅助连续SEI层的快速形成。结果，在100次循环后，CUS-C @ NB2O5-C NFS电极的容量保留保持在93.1％，远大于CUS-C NF电极（74.6％）; Coulombic效率稳定在99.0％以上的过程缩短至30个循环的5个循环。 COS2-C @ NB2O5-C和NIS2-C @ NB2O5-C NFS电极也发现了此进度。通过限制效果提高的基库仑效率和循环稳定性提供了促进转化反应阳极的K离子储存性能的容易方法。

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  • 来源
    《Advanced Functional Materials》 |2020年第52期|2007712.1-2007712.10|共10页
  • 作者

    Cao Kangzhe; Zheng Runtian; Wang Shaodan; Shu Jie; Liu Xiaogang; Liu Huiqiao; Huang Ke-Jing; Jing Qiang-Shan; Jiao Lifang;

  • 作者单位

    Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China;

    Ningbo Univ Fac Mat Sci & Chem Engn Ningbo 315211 Peoples R China;

    Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China;

    Ningbo Univ Fac Mat Sci & Chem Engn Ningbo 315211 Peoples R China;

    Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China;

    Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China;

    Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China;

    Xinyang Normal Univ Coll Chem & Chem Engn Henan Prov Key Lab Utilizat Nonmetall Mineral Sou Xinyang 464000 Peoples R China;

    Nankai Univ Coll Chem Key Lab Adv Energy Mat Chem Minist Educ Tianjin 300071 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    confinement effect; conversion reaction anode; high coulombic efficiency; long cycling stability; SEI layers;

    机译：限制效果;转换反应阳极;高库仑效率;长循环稳定性;SEI层;

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