期刊
ADVANCED FUNCTIONAL MATERIALS
卷 33, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202212466
关键词
cationic covalent organic frameworks; separator modification; solvation structures; solid electrolyte interphase
Through material modification, the commercial polypropylene separator is successfully modified with a cationic covalent organic framework (COF-F@PP), which has abundant nanopores to homogenize the lithium ions flux and can interact with electrolyte solvent molecules to form a desolvation structure of Li+. The F- within the nanopores helps to build a robust LiF-riched solid electrolyte interphase to avoid side reactions between the lithium anode and electrolyte. Therefore, COF-F@PP exhibits excellent cycling stability, high Coulombic efficiency, and superior rate capability in Li//LFP coin cell at 5 C, low N/P ratio (2.19) full cell, and pouch cell at 1 C.
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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