材料科学
分离器(采油)
电解质
阳离子聚合
法拉第效率
阳极
纳米孔
锂(药物)
共价有机骨架
纳米技术
无机化学
化学工程
电极
高分子化学
复合材料
化学
热力学
工程类
物理
内分泌学
物理化学
医学
多孔性
作者
Shi‐Yan Yao,Yan Yang,Ziwei Liang,Jiahe Chen,Jieying Ding,Fangkun Li,Junhao Liu,Lei Xi,Min Zhu,Jun Liu
标识
DOI:10.1002/adfm.202212466
摘要
Abstract Separator modification is an efficient strategy to handle with the challenges of lithium metal batteries but its success is primarily subject to the modification of the materials. Herein, a cationic covalent organic framework (COF) composed of positively charged organic units and weakly bonded fluoride ions (F − ) is introduced to modify the commercial polypropylene separator (COF−F@PP). It is found that the organic unit has abundant nanopores to homogenize the lithium ions (Li + ) flux and can interact with electrolyte solvent molecules to form a desolvation structure of Li + . Meanwhile, the F − within the nanopores is proved to assist in building a robust LiF−riched solid electrolyte interphase to avoid the side reactions between lithium anode and electrolyte. Hence, the COF−F@PP delivers feasible practicality for the outstanding cycling stability, high Coulombic efficiency, and superior rate capability of Li//LFP coin cell at 5 C, low N/P ratio (2.19) full cell, and pouch cell at 1 C.
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