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Selectively Wetted Rigid–Flexible Coupling Polymer Electrolyte Enabling Superior Stability and Compatibility of High‐Voltage Lithium Metal Batteries
Author(s) -
Yu Xinrun,
Wang Longlong,
Ma Jun,
Sun Xingwei,
Zhou Xinhong,
Cui Guanglei
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201903939
Subject(s) - materials science , polyvinylidene fluoride , electrolyte , polymer , compatibility (geochemistry) , chemical engineering , polyvinyl acetate , cathode , electrode , conductivity , wetting , anode , composite material , chemistry , engineering
Solid polymer electrolytes (SPEs) are considered to be the key to solve the safety hazards and cycling performance of liquid high‐voltage lithium metal batteries (HVLMBs), but still suffer from low conductivity and poor interfacial compatibility. Here, polyvinylidene fluoride–polyvinyl acetate‐based (PVDF–PVAC) rigid–flexible coupling SPE selectively wetted by a tetramethylene sulfone (TMS) is prepared for high‐performance and superior‐safety HVLMBs. The intermolecular interactions in such SPE significantly facilitate lithium‐ion conductivity and electrolyte/electrode interface wettability. Moreover, PVAC selectively wetted with the TMS enhances interface compatibility with Li anodes and high‐voltage LiCoO 2 cathodes. As a result, the as‐assembled LiCoO 2 /lithium‐metal solid‐state batteries present excellent cyclability with 85% capacity retention after 200 cycles between 3.0 and 4.5 V at room temperature. Furthermore, pouch cells with the as‐prepared SPE exhibit brilliant safety and superior interfacial compatibility. This study offers a promising and general selectively wetted design strategy to handle the compatibility and safety issues in HVLMBs.