The formation of a stable solid electrolyte interphase (SEI) layer is very important for improving the cycling stability and safety of lithium metal batteries (LMBs). However, since the reactivity of lithium metal anodes (LMAs) is very high, controlling the movement of Li+ at the anode/electrolyte interface remains challenging. In this study, an approach involving coating a fluorine functional-controlled fluorinated carbon (CFX) layer onto a commercial PE separator to form a stable SEI layer was proposed. The strong reaction between the fluorine functional groups constituting CFX and Li+ facilitated the rapid formation of a LiF-rich SEI layer in the resting and initial cycling stages. This initial stable SEI layer promoted a subsequent homogeneous Li+ flux, thus improving the LMA stability. In addition, the mechanism by which the total amount of fluorine and the fluorine functional groups control the Li+ dynamics through the CFX-coated PE separator with controlled fluorine functional groups was used to identify the mechanism by which the total amount of fluorine and the fluorine functional groups provide the advantage of the creation of a stable SEI layer. Therefore, this study contributes to the energy storage field by solving the cycling stability problem related to LMAs and emphasizes that a stable SEI layer can be formed based on the important interface control according to the type of fluorine functional group.

中文翻译：

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通过氟化碳 （CFX） 复合隔膜设计富 LiF 固体电解质界面层用于稳定锂金属电池


稳定的固体电解质界面 （SEI） 层的形成对于提高锂金属电池 （LMB） 的循环稳定性和安全性非常重要。然而，由于锂金属负极 （LMA） 的反应性非常高，因此控制 Li+ 在负极/电解质界面处的运动仍然具有挑战性。在本研究中，提出了一种将氟功能控制氟化碳 （CFX） 层涂覆在商用 PE 隔膜上以形成稳定 SEI 层的方法。构成 CFX 和 Li+ 的氟官能团之间的强烈反应促进了在静止和初始循环阶段快速形成富含 LiF 的 SEI 层。这个初始稳定的 SEI 层促进了随后的均匀 Li+ 磁通量，从而提高了 LMA 的稳定性。此外，氟总量和氟官能团通过具有受控氟官能团的 CFX 涂层 PE 隔膜控制 Li+ 动力学的机制用于确定氟总量和氟官能团提供创建稳定 SEI 层的优势的机制。因此，本研究通过解决与 LMAs 相关的循环稳定性问题，为储能领域做出贡献，并强调根据氟官能团的类型，基于重要的界面控制可以形成稳定的 SEI 层。