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Lithium Dendrites Inhibition via Diffusion Enhancement

机译：锂枝晶通过扩散增强抑制

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摘要

The dendritic structure is a disastrous problem of lithium metal batteries as well as other metal rechargeable batteries. The dendritic structures are usually caused by diffusion limitation. Here, a novel strategy is reported to inhibit lithium dendrites based on the understanding of their formation mechanism. An alternating current field perpendicular to the anode is set up, which promotes Li+ movement along the anode surface and prevents ions' deposition on the tips from forming dendrites. Furthermore, an external direct current field parallel to the current is employed, which accelerates the transport of Li+ in electrolytes to mitigate the concentration gradient nearby the anode and thus inhibits the formation of dendritic structures. A simultaneous employment of these two fields gains five times increase of the lifespan of batteries at the high charging current density of 2 mA cm(-2), confirming the effectiveness of this strategy in protecting the metal anode and inhibiting lithium dendrites. This strategy may have a wide feasibility since it does not change the materials and structures of batteries.
机译：树突结构是锂金属电池的灾难性问题以及其他金属可充电电池。树枝状结构通常由扩散限制引起。这里，据报道，基于对其形成机制的理解来抑制锂枝晶的新策略。建立垂直于阳极的交流场，其促进沿阳极表面的Li +运动，并防止离子在尖端上形成树枝状体。此外，采用平行于电流的外部直流场，其加速了电解质中Li +的传输，以减轻阳极附近的浓度梯度，从而抑制树突结构的形成。这两个领域的同时就业提升了2 mA cm（-2）的高充电电流密度的电池寿命增加了五倍，确认了该策略在保护金属阳极和抑制锂枝曲粒方面的有效性。该策略可能具有广泛的可行性，因为它不会改变电池的材料和结构。

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  • 来源
    《Advanced energy materials》 |2019年第17期|1900019.1-1900019.7|共7页
  • 作者

    Chen Yongxiu; Dou Xiangyu; Wang Kai; Han Yongsheng;

  • 作者单位

    Chinese Acad Sci State Key Lab Multiphase Complex Syst Inst Proc Engn Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Chem Engn Beijing 100049 Peoples R China;

    Chinese Acad Sci State Key Lab Multiphase Complex Syst Inst Proc Engn Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Chem Engn Beijing 100049 Peoples R China;

    Chinese Acad Sci State Key Lab Multiphase Complex Syst Inst Proc Engn Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Chem Engn Beijing 100049 Peoples R China;

    Chinese Acad Sci State Key Lab Multiphase Complex Syst Inst Proc Engn Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Chem Engn Beijing 100049 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    concentration gradient; dendrites; diffusion enhancement; external electric field; lithium batteries;

    机译：浓度梯度;树突;扩散增强;外电场;锂电池;

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