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A bidirectional growth mechanism for a stable lithium anode by a platinum nanolayer sputtered on a polypropylene separator

机译：铂纳米层溅射在聚丙烯分离器上溅射的稳定锂阳极的双向生长机制

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摘要

The issue of uncontrollable Li dendrite growth, caused by irregular lithium deposition, restricts the wide applications of Li metal based high energy batteries. In this paper, a polypropylene separator with a sputtered platinum nanolayer has been developed to improve the stability of the Li metal anodes. It was found that cells using the modified separators resulted in a smooth Li surface and a stable electrode-electrolyte interface. On the one hand, platinum nanolayers can enhance the mechanical properties and micro-structures of commercial polypropylene separators. On the other hand, platinum nanolayers provide stable Li deposition during repeated charging/discharging by a bidirectional growth mechanism. After long-time cycling, the dendrites from opposite directions and dead Li are integrated into a flat and dense new-formed Li anode, decreasing the risk of low Coulombic efficiency and cycling instability that may end in cell failure. This design may provide new ideas in next-generation energy storage systems for advanced stable metallic battery technologies.
机译：由不规则锂沉积引起的无法控制的Li Dendrite生长的问题限制了Li金属高能量电池的广泛应用。本文已经开发出具有溅射铂纳米层的聚丙烯分离器以改善Li金属阳极的稳定性。发现使用改性分离器的细胞导致平滑的Li表面和稳定的电极 - 电解质界面。一方面，铂纳米层可以增强商业聚丙烯分离器的机械性能和微结构。另一方面，铂纳米层在通过双向生长机制重复充电/放电期间提供稳定的LI沉积。在长时间循环之后，将来自相反方向和死原的树枝状物集成到一个平坦和致密的新形成的Li阳极中，降低了低库仑效率和循环不稳定性的风险，可能在细胞失效中结束。该设计可以在下一代储能系统中提供新的思想，用于高级稳定的金属电池技术。

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  • 来源
    《RSC Advances》 |2018年第23期|共6页
  • 作者

    Wen Kaihua; Liu Lili; Chen Shimou; Zhang Suojiang;

  • 作者单位

    Chinese Acad Sci Inst Proc Engn CAS Key Lab Green Proc &

    Engn Beijing Key Lab Ionic Liquids Clean Proc Beijing 100190 Peoples R China;

    Beijing Technol &

    Business Univ Sch Sci China Natl Light Ind Key Lab Cosmet Beijing 100048 Peoples R China;

    Chinese Acad Sci Inst Proc Engn CAS Key Lab Green Proc &

    Engn Beijing Key Lab Ionic Liquids Clean Proc Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Proc Engn CAS Key Lab Green Proc &

    Engn Beijing Key Lab Ionic Liquids Clean Proc Beijing 100190 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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