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Dendrite-Free Lithium Plating Induced by In Situ Transferring Protection Layer from Separator

机译：分离器原位转移保护层诱导的无枝晶锂电镀

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摘要

Lithium (Li) metal anodes are regarded as a promising pathway to meet the rapidly growing requirements on high energy density cells, owing to their highest gravimetric capacity (3840 mAh g(-1)) and their lowest redox potential. The application of Li metal anodes, however, is still hindered by undesired dendrites formation and endless consumption of liquid electrolyte due to a continuous reaction on interface of electrolyte/Li-metal without a stable solid-electrolyte-interface (SEI) layer. A stable protection layer is formed on Li metal anode by in situ transferring the coating layer from polymer separator. The Li anode protection strategy is developed with an in situ formed protection layer transferred through the reduction of a coating layer on polymer separator. A PbZr0.52Ti0.48O3 (PZT) coating layer on polypropylene (PP) separator is reduced by Li metal anode to produce a Pb metal containing composite layer, which could form Pb-Li alloy and adhere to the surface of Li metal anode after the reaction and improves the Li plating/stripping efficiency owing to the formation of a more homogenized electric field. Both the Li/Li symmetric cells and LiFePO4/Li cells with this PZT precoated PP separators exhibit significantly improved Coulombic efficiency and cycling life.
机译：锂（Li）金属阳极由于具有最高的重量分析能力（3840 mAh g（-1））和最低的氧化还原电位，因此被认为是满足对高能量密度电池快速增长的需求的有前途的途径。然而，由于在电解质/锂金属的界面上没有稳定的固体电解质界面（SEI）层的连续反应，不希望的枝晶形成和液体电解质的无尽消耗仍然阻碍了锂金属阳极的应用。通过从聚合物隔板原位转移涂层，在锂金属阳极上形成稳定的保护层。锂阳极保护策略是通过还原聚合物隔板上的涂层来转移原位形成的保护层而开发的。聚丙烯（PP）隔膜上的PbZr0.52Ti0.48O3（PZT）涂层被锂金属阳极还原，生成了含铅金属复合层，该复合层可形成铅锂合金并在锂合金阳极表面附着在锂金属阳极表面由于形成了更均匀的电场，反应和提高了锂电镀/剥离效率。使用这种PZT预涂PP隔膜的Li / Li对称电池和LiFePO4 / Li电池均显示库仑效率和循环寿命显着提高。

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