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Sodium Deposition with a Controlled Location and Orientation for Dendrite-Free Sodium Metal Batteries

机译：钠沉积，具有可控定位和方向的树枝状钠金属电池

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摘要

Sodium is one of the most promising alternatives to lithium as an anode material for next-generation batteries. However, severe Na dendrite growth hinders its practical implementation. Here, a polyacrylonitrile (PAN) fiber film coated with a thin layer of tin on the bottom side (closing to battery case) serves as a scaffold for Na deposition. Due to the low nucleation barrier enabled by the Sn layer, Na deposition spontaneously occurs at the bottom of the scaffold, and then is homogeneously confined within its 3D network because of the decreased local current density caused by 3D structure and uniform Na(+)distribution regulated by the sodiophilic PAN. With this well-controlled orientation of Na deposition, the Na-PAN/Sn electrode delivers a high Coulombic efficiency of 99.5% in Na plating/stripping at 5 mA cm(-2), stable operation for over 2500 h in symmetric batteries at 2 mA cm(-2), and excellent cyclic stability and rate capability in Na metal full batteries.
机译：钠是锂作为下一代电池的阳极材料最有前途的替代品之一。然而，严重的Na Dendrite生长阻碍了其实际实施。这里，在底侧（关闭电池壳体的薄膜涂有薄锡的聚丙烯腈（盘）纤维膜用作用于Na沉积的支架。由于Sn层使能的低成核屏障，Na沉积自发地发生在支架的底部，然后由于3D结构和均匀的NA（+）分布引起的局部电流密度降低，因此在其3D网络内均匀地限制由牛仔毛利锅调节。利用这种受控良好的Na沉积取向，Na-Pan / Sn电极在5 mA cm（-2）的Na电镀/剥离中提供高99.5％的高水库效率，在2的对称电池中稳定运转。 MA CM（-2），以及NA金属全电池中的优异循环稳定性和速率能力。

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  • 来源
    《Advanced energy materials》 |2020年第44期|2002308.1-2002308.8|共8页
  • 作者

    Xu Ying; Wang Chuanlong; Matios Edward; Luo Jianmin; Hu Xiaofei; Yue Qin; Kang Yijin; Li Weiyang;

  • 作者单位

    Univ Elect Sci & Technol China Inst Fundamental & Frontier Sci Chengdu 610054 Peoples R China;

    Dartmouth Coll Thayer Sch Engn Hanover NH 03786 USA;

    Dartmouth Coll Thayer Sch Engn Hanover NH 03786 USA;

    Dartmouth Coll Thayer Sch Engn Hanover NH 03786 USA;

    Dartmouth Coll Thayer Sch Engn Hanover NH 03786 USA;

    Univ Elect Sci & Technol China Inst Fundamental & Frontier Sci Chengdu 610054 Peoples R China;

    Univ Elect Sci & Technol China Inst Fundamental & Frontier Sci Chengdu 610054 Peoples R China;

    Dartmouth Coll Thayer Sch Engn Hanover NH 03786 USA;

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  • 正文语种 eng
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  • 关键词

    bottom coating; orientation; polyacrylonitrile; sodium metal batteries;

    机译：底部涂层;取向;聚丙烯腈;金属电池;

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