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A separator modified by spray-dried hollow spherical cerium oxide and its application in lithium sulfur batteries

机译：由喷雾干燥的中空球形氧化铈改性的分离器及其在锂硫电池中的应用

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摘要

Large-scale application of lithium sulfur batteries (LSBs) has been hindered by certain intrinsic obstacles, particularly the shuttle effect of lithium polysulfides (LiPSs) generated during the redox process. A separator modified with various materials was proposed and demonstrated as an effective method to handle these obstacles. In this study, hollow spherical cerium oxide (CeO2) fabricated by a practical approach, spray granulation, served as the separator coating material. LSBs with this hollow spherical cerium oxide-coated separator presented excellent electrochemical performances compared with reference samples using a super P-coated separator or a routine separator. This CeO2 layer can not only block and absorb lithium polysulfides (LiPSs), but also facilitate the transportation of electrons and ions as an upper current collector as well as a catalyst. The initial discharge capacity of this CeO2-coated separator sample reaches 1004 mA h g(-1) at 1C (1675 mA h g(-1)) and the reversible capacity is maintained at 625 mA h g(-1) after 500 cycles, implying an excellent capacity retention. The high rate discharge capacity at 2C is as high as 760 mA h g(-1), which demonstrates a promising rate performance. The elemental mappings of scanning electron microscopy (SEM) and transmission electron microscopy (TEM), as well as the testing results of cyclic voltammetry (CV), further confirm the function of this hollow spherical CeO2-coated separator.
机译：锂硫电池（LSB）的大规模应用已经受到某些内在障碍的阻碍，特别是在氧化还原过程中产生的锂多硫化物（嘴唇）的梭效应。提出了一种用各种材料改性的隔膜，并证明了处理这些障碍的有效方法。在该研究中，通过实用方法制造的空心球形氧化铈（CEO2），喷雾造粒作为分离器涂层材料。与使用超级p涂覆的分离器或常规分离器的参考样品相比，具有这种中空球形氧化铈涂覆的隔膜的LSB与参考样品相比呈现出优异的电化学性能。该CEO2层不仅可以阻塞和吸收多硫化物（唇缘），还可以促进电子和离子作为上集电器以及催化剂的运输。该CEO2涂覆的隔膜样品的初始放电容量在1C（1675mA Hg（-1））下达到1004 mA Hg（-1），并且在500次循环后，可逆容量保持在625 mA Hg（-1），暗示优异的容量保留。 2C的高速率放电容量高达760 mA H G（-1），这表明了有希望的速率性能。扫描电子显微镜（SEM）和透射电子显微镜（TEM）的元素映射以及循环伏安法（CV）的测试结果，进一步证实了该中空球形CEO2涂层分离器的功能。

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  • 来源
    《RSC Advances》 |2016年第116期|共8页
  • 作者

    Qian Xinye; Zhao Di; Jin Lina; Yao Shanshan; Rao Dewei; Shen Xiangqian; Zhou Youyuan; Xi Xiaoming;

  • 作者单位

    Jiangsu Univ Coll Mat Sci &

    Engn Inst Adv Mat Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Coll Mat Sci &

    Engn Inst Adv Mat Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Coll Mat Sci &

    Engn Inst Adv Mat Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Coll Mat Sci &

    Engn Inst Adv Mat Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Coll Mat Sci &

    Engn Inst Adv Mat Zhenjiang 212013 Peoples R China;

    Jiangsu Univ Coll Mat Sci &

    Engn Inst Adv Mat Zhenjiang 212013 Peoples R China;

    Changsha Res Inst Min &

    Met Hunan Engn Lab Power Battery Cathode Mat Changsha 410012 Hunan Peoples R China;

    Changsha Res Inst Min &

    Met Hunan Engn Lab Power Battery Cathode Mat Changsha 410012 Hunan Peoples R China;

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  • 中图分类 化学;
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