IONIC CONDUCTIVITY AND LITHIUM TRANSFERENCE NUMBER OF POLY(ETHYLENE OXIDE):LiTFSI SYSTEM
作者： K. Pożyczka , M. Marzantowicz , J.R. Dygas , F. Krok
DOI: 10.1016/J.ELECTACTA.2016.12.172
关键词:
摘要: Abstract Polymer electrolytes comprising LiN(CF3SO2)2 salt (LiTFSI) and high molecular weight poly(ethylene oxide) PEO are prepared by casting from solution. A wide range of concentration is studied, molar ratio EO:Li 50:1 to 1.5:1. Samples measured in symmetrical Li|electrolyte|Li cell. The values lithium transference number t+ determined using a novel procedure, which involves impedance spectroscopy as well two potentiostatic polarization segments with opposite sign d.c. bias. principles this procedure based on Bruce-Vincent method, has been extended order compensate the possible differences properties Li|electrolyte interfaces, ensure proper conditioning cell between different stages measurement process. results analyzed Watanabe approaches, give similar number. reported initially decrease rising salt, but after passing minimum at around 6:1, considerable increase recorded, eventually leading higher than 0.5 for “polymer salt” systems. Such behavior studied system discussed either terms formation PEO:salt complexes, or ionic aggregates.
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