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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Ant-nest-like Cu2-xSe@C with biomimetic channels boosts the cycling performance for lithium storage
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Ant-nest-like Cu2-xSe@C with biomimetic channels boosts the cycling performance for lithium storage

机译：具有仿生通道的蚂蚁巢状Cu2-XSE @ C增强了锂储存的循环性能

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摘要

Controlling the microstructure and composition of electrodes is crucial to enhance their rate capability and cycling stability for lithium storage. Inspired by the highly interconnected network and good mechanical integrity of an ant-nest architecture, herein, a biomimetic strategy is proposed to enhance the electrochemical performance of Cu2-xSe. After facile carbonization and selenization treatments, the 3D Cu-MOF is successfully transformed into the final ant-nest-like Cu2-xSe@C (AN-Cu2-xSe@C). The AN-Cu2-xSe@C is composed of interconnected Cu2-xSe channels with amorphous carbon coated on the outer surface. The 3D interconnected channels within the AN-Cu2-xSe@C provide fast charge transport pathways and enhanced structural integrity to tolerate the large volume fluctuations of Cu2-xSe during cycling. When applied as the anode for lithium storage, the AN-Cu2-xSe@C shows remarkable electrochemical performance with a high capacity of 1452 mA h g(-1) after 1200 cycles at 1.0 A g(-1) and 879 mA h g(-1) after 2500 cycles at 10.0 A g(-1), respectively. Mechanism investigations demonstrate that the AN-Cu2-xSe@C experiences complicated conversion-intercalation co-existence reactions upon cycling. The existence of capacitive behaviour (74%) also contributes to the extended cycling performance. Our work offers a new avenue for designing a high performance electrode using the biomimetic concept.
机译：控制电极的微观结构和成分对于提高其储锂的速率能力和循环稳定性至关重要。受蚂蚁巢结构高度互联的网络和良好的机械完整性的启发，本文提出了一种仿生策略来提高Cu2-xSe的电化学性能。经过简单的碳化和硒化处理，3D Cu MOF成功转化为最终的蚂蚁巢状Cu2-xSe@C（AN-Cu2）-xSe@C).AN-Cu2-xSe@C由相互连接的Cu2 xSe通道组成，外表面涂有无定形碳。AN-Cu2内的3D互连通道-xSe@C提供快速的电荷传输路径和增强的结构完整性，以承受循环过程中Cu2-xSe的大体积波动。当用作储锂阳极时，AN-Cu2-xSe@C显示出显著的电化学性能，在1.0Ag（-1）下1200次循环后的高容量为1452 mA h g（-1），在10.0Ag（-1）下2500次循环后的高容量为879 mA h g（-1）。机理研究表明，AN-Cu2-xSe@C在循环过程中经历了复杂的转化-插层共存反应。电容行为（74%）的存在也有助于延长循环性能。我们的工作为利用仿生概念设计高性能电极提供了一条新途径。

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    Luo Wanshu; Cao Meng; Pan Hanqing; Wang Qingqing; Ma Yinglan; Wang Chao; Wang Ying; Gu Yingqiu; Zhang Lei;

  • 作者单位

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Jiangsu Normal Univ Sch Chem &

    Mat Sci Jiangsu Key Lab Green Synthet Chem Funct Mat Xuzhou 221116 Jiangsu Peoples R China;

    Griffith Univ Ctr Clean Environm &

    Energy Gold Coast Campus Southport Qld 4222 Australia;

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  • 正文语种 eng
  • 中图分类 化学;无机化学;
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