Solvent-Free Method Prepared Sandwich-Like Nanofibrous Membrane-Reinforced Polymer Electrolyte for High Performance All-Solid-State Lithium Batteries.
ACS applied materials & interfaces(2020)
摘要
Solid polymer electrolytes (SPEs) with the advantages of high safety, low volatility, and the ability to suppress Li dendrites are highly desirable used in next generation high-safety and high-energy lithium-ion batteries (LIBs). The exploration of solid polymer electrolytes with superior comprehensive properties has received extensive attentions for high performance all-solid-state batteries (ASSBs). Herein, a sandwich-like nanofibrous membrane reinforced poly-caprolaclone diol (PCL) and trimethyl phosphate (TMP) composite polymer electrolyte (CPE) has been designed by a facile "solvent-free" solution-casting method. Specifically, the flame retardant TMP is employed as a plasticizer, which can improve the ionic conductivity effectively. The as-prepared solid electrolyte exhibits superior comprehensive performance in terms of high ionic conductivity, wide electrochemical window, good compatibility with lithium metal, and superior thermal stability. Furthermore, the assembled Li//LiFePO4 ASSBs with this solid CPE show outstanding cycling stability and high average discharge capacity at room temperature (30 ºC). Undoubtedly, our study provides a new facile method and qualified solid electrolyte material for next generation high performance ASSBs.
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关键词
all-solid-state batteries,solid composite polymer electrolytes,ionic conductivity,poly-caprolaclone diol,trimethyl phosphate
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