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Low-Cost Regulating Lithium Deposition Behaviors by Transition Metal Oxide Coating on Separator

机译：通过过渡金属氧化物涂层在隔膜上的低成本调节锂沉积行为

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摘要

The application of lithium metal anode, despite being of the highest capacity, is hindered by low Coulombic efficiency (CE) and serious lithium dendrites formation. A strategy of transition metal oxides (TMOs) particles coated porous polypropylene (PP) separator is developed to regulate lithium deposition behaviors through in situ forming artificial solid electrolyte interface (SEI) passivating layers. By virtue of quite low solubilities of TMOs in the electrolyte, the concentration of TMOs in the electrolyte can be maintained at a constant and the dissolved TMOs can be reduced to produce Li2O and Mn particles, which not only function as lithium nucleating seeds but are also involved in the formation of the SEI layer. The sustainably existed trace of TMOs ensures the artificial SEI layer can be re-healed once damaged by the volume expansion of lithium. With the help of one typical TMO of MnO coating on PP, an interesting dendrite-free dual layer Li deposition is observed, which significantly improves the CE of Li||Cu cells and cycling life of Li||Li cells. Using MnO coated PP, ultra-thin lithium films are deposited on copper foils with an in situ constructed SEI passivating layer, which exhibits a much improved cycling performance in liquid ether electrolyte and even better performance in gel polymer electrolyte.
机译：锂金属阳极的应用尽管存在最高的容量，受到低库仑效率（Ce）和严重的锂枝晶形成的阻碍。过渡金属氧化物（TMOS）颗粒涂覆多孔聚丙烯（PP）分离器的策略以通过原位形成人造固体电解质界面（SEI）钝化层来调节锂沉积行为。借助于电解质中TMOS的相当低，电解质中的TMO的浓度可以保持在恒定，并且可以降低溶解的TMO，以产生Li2O和Mn颗粒，这不仅用作锂核性种子而且也是如此参与形成SEI层。可持续存在的TMOS痕迹确保人工SEI层可以重新愈合，一次被锂的体积膨胀损坏。借助于PP的MNO涂层的典型TMO的帮助，观察到一种有趣的树枝状双层LI沉积，从而显着改善了Li || Zl细胞的Ce和Li || Li细胞的循环寿命。使用MNO涂覆的PP，用原位构造的SEI钝化层沉积超薄锂膜在铜箔上，其在液体醚电解质中表现出大大改善的循环性能，甚至在凝胶聚合物电解质中的性能更好。

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  • 来源
    《Advanced Functional Materials》 |2021年第16期|2007255.1-2007255.13|共13页
  • 作者

    Yan Jun; Liu Feng-Quan; Gao Jian; Zhou Weidong; Huo Hong; Zhou Jian-Jun; Li Lin;

  • 作者单位

    Beijing Normal Univ Beijing Key Lab Energy Convers & Storage Mat Coll Chem Beijing 100875 Peoples R China;

    Beijing Normal Univ Beijing Key Lab Energy Convers & Storage Mat Coll Chem Beijing 100875 Peoples R China;

    Beijing Univ Chem Technol Dept Chem Engn State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China;

    Beijing Univ Chem Technol Dept Chem Engn State Key Lab Organ Inorgan Composites Beijing 100029 Peoples R China;

    Beijing Normal Univ Beijing Key Lab Energy Convers & Storage Mat Coll Chem Beijing 100875 Peoples R China;

    Beijing Normal Univ Beijing Key Lab Energy Convers & Storage Mat Coll Chem Beijing 100875 Peoples R China;

    Beijing Normal Univ Beijing Key Lab Energy Convers & Storage Mat Coll Chem Beijing 100875 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    layer#8208; by#8208; layer Li deposition; lithium metal batteries; self#8208; healing interface; sustained release; transition metal oxide;

    机译：层＆＃8208;＆＃8208;层li沉积;锂金属电池;自我＆＃8208;愈合界面;持续释放;过渡金属氧化物;

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