Characterization of Solvent-Free Polymer Electrolytes Consisting of Ternary PEO–LiTFSI–PYR[sub 14] TFSI

作者：Joon‐Ho Shin, Wesley A. Henderson, Cosimo Tizzani, Stefano Passerini, Sangsik Jeong, Ki-Won Kim · 发表于：Journal of The Electrochemical Society · 年份：2006 · DOI：10.1149/1.2211928 · 被引用次数：125 · 研究领域：Advanced Battery Materials and Technologies、Ionic liquids properties and applications、Advancements in Battery Materials

The physical properties and electrochemical performance of solvent-free polymer electrolytes, consisting of poly͑ethylene oxide͒ ͓P͑EO͔͒ with Li + and N-butyl-N-methylpyrrolidinium ͑PYR 14 + ͒ salts of bis͑trifluoromethanesulfonyl͒imide ͑TFSI͒, are reported.The addition of the PYR 14 TFSI room-temperature molten salt to the conventional P͑EO͒ 10 LiTFSI polymer electrolyte results in a significant enhancement of the ionic conductivity ͑to 2.6 ϫ 10 -4 S/cm at 20°C͒.Li metal/LiFePO 4 batteries making use of this new family of solid polymer electrolytes have shown a very promising low-temperature cycle life.It was found that a Li metal/LiFePO 4 cell at 20°C can deliver 138 mAh/g during the first discharge, corresponding to 90% of the nominal specific capacity ͑154 mAh/g͒, and a promisingly low capacity fading of about 0.2%/cycle over 500 cycles.