Abstract Herein, we suggest a new way to improve the cycling stability of the lithium-metal battery by using a separator coated by carbon monofluoride (CFx). CFx has been used as a cathode material for a lithium primary battery and is converted to LiF and carbon during the discharge process. The CFx-coated separator with 5 μm thickness is obtained by casting a CFx-containing slurry on a bare polyethylene separator and the CFx-coated separator is characterized in a LiCoO2 (LCO) // Li cell. The CFx-coated separator enables a better cycling stability up to 200 cycles than the bare separator due to its dual functions: 1) capturing cobalt ions dissolved from the LCO cathode and 2) formation of a thin and stable SEI layer containing LiF on the lithium metal anode. Employment of the CFx-coated separator also leads to much suppressed dendritic growth of lithium and stable interfacial resistance during the cycle.

中文翻译：

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锂金属电池隔膜上的双功能一氟化碳 (CFx) 涂层具有增强的循环稳定性

摘要 在此，我们提出了一种通过使用一氟化碳 (CFx) 涂层的隔膜来提高锂金属电池循环稳定性的新方法。CFx 已被用作锂一次电池的正极材料，并在放电过程中转化为 LiF 和碳。通过在裸聚乙烯隔膜上浇注含 CFx 的浆料获得 5 μm 厚度的 CFx 涂层隔膜，并且 CFx 涂层隔膜的特征在于 LiCoO2 (LCO) // Li 电池。由于其双重功能，CFx 涂层隔膜比裸隔膜具有更好的循环稳定性，最多可循环 200 次：1）捕获从 LCO 阴极溶解的钴离子；2）在锂上形成含有 LiF 的薄而稳定的 SEI 层金属阳极。