An unstable solid electrolyte interphase (SEI) and chaotic lithium ion flux are key impediments to commercial high-energy-density lithium batteries because of the uncontrolled growth of rigid lithium dendrites, which would pierce through the conventional polypropylene (PP) separator, causing short circuit and safety issues. Herein, the homogenization of lithium ion flux and the generation of stable SEI layers on lithium anodes were achieved via coating a fluorine-functionalized Ti₃C₂ (F-Ti₃C₂) nanosheets on PP separator (F-Ti₃C₂@PP). F-Ti₃C₂ nanosheets provide abundant ions pathways to homogeneously manipulate lithium ion flux and increase the Young’s modulus and electrolyte wettability of the separators. In addition, F species derived from the F-Ti₃C₂ nanosheets would promote the formation of LiF-rich SEI film. The synergistic effect contribute to the uniform lithium deposition. Symmetric Li|Li, asymmetric Li|Cu and full Li|LiFePO₄ cells incorporated with the modified separators exhibit improved electrochemical performance even under lean electrolyte conditions. This work provides a feasible strategy to improve the performance of lithium batteries through both fluoridized SEI formation and lithium ion flux manipulation.

不稳定的固体电解质界面 (SEI) 和混乱的锂离子通量是商用高能量密度锂电池的主要障碍，因为刚性锂枝晶的不受控制的生长会刺穿传统的聚丙烯 (PP) 隔膜，导致短路和安全问题。这里，锂离子通量均匀化和锂阳极稳定的SEI层的产生通过涂布氟官能的Ti分别实现₃ Ç ₂（F-的Ti ₃ Ç ₂）对PP分离器纳米片（F-的Ti ₃ Ç ₂ @ PP）。F-Ti ₃ C ₂纳米片提供了丰富的离子途径来均匀地操纵锂离子通量并增加隔膜的杨氏模量和电解质润湿性。此外，源自 F-Ti ₃ C ₂纳米片的F 物种将促进富含 LiF 的 SEI 膜的形成。协同效应有助于均匀的锂沉积。对称 Li|Li、不对称 Li|Cu 和全 Li|LiFePO ₄电池与改性隔膜结合，即使在贫电解质条件下也表现出改善的电化学性能。这项工作提供了一种可行的策略，通过氟化 SEI 的形成和锂离子通量的控制来提高锂电池的性能。