材料科学
分离器(采油)
法拉第效率
成核
膜
多孔性
电化学
化学工程
纳米技术
复合材料
有机化学
电极
物理化学
工程类
物理
热力学
化学
生物化学
作者
Guo Lin,Kun Jia,Zhongxiang Bai,Chenchen Liu,Shuning Liu,Yumin Huang,Xiaobo Liu
标识
DOI:10.1002/adfm.202207969
摘要
Abstract The development of multifunctional separators can be an effective solution for solving the lithium dendrite and safety issues of lithium metal batteries (LMBs). This study reveals an interfacial reaction protocol to prepare a functional separator to regulate lithium‐ion transport and enhance the safety of LMBs. Specifically, the well‐organized anionphilic MOFs layers are in situ grafted on both sides of porous super‐engineering polyarylene ether nitrile (PEN) membranes pre‐modified with polydopamine (PDA), which leads to sandwiched MOF/PEN@PDA/MOF multifunctional separators. Electrochemical tests prove that the optimized separator acts as a “Li‐ion guides” to balance the internal electric field and limit the free migration of anions, which extends the “Sand's time” of lithium dendrite nucleation and contributes a high Li + transfer number of 0.81. On account of the alleviated interface side reactions, the optimized battery exhibits a highly stable lithium plating–stripping cycle of over 500 h. Meanwhile, the functional separator shows better thermal stability than its conventional polypropylene counterpart. Thanks to these features, the assembled LFP/Li cells with optimized separator exhibit stable cycling performance and high coulombic efficiency of 98% even at 90 °C. The current study opens a new path to designing separators for solving the lithium dendrite and safety issues of LMBs.
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