Star-branched poly(ethylene oxide) LiN(CF3SO2)2: A promising polymer electrolyte
作者： M. Marzantowicz , J.R. Dygas , F. Krok , A. Tomaszewska , Z. Florjańczyk
DOI: 10.1016/J.JPOWSOUR.2009.01.011
关键词: Ethylene oxide 、 Chemical engineering 、 Dielectric spectroscopy 、 Electrolyte 、 Differential scanning calorimetry 、 Polymer chemistry 、 Ionic conductivity 、 Polymer 、 Materials science 、 Crystallization 、 Conductivity
摘要: Abstract Polymer electrolytes composed of star-branched poly(ethylene oxide) PEO with addition LiN(CF 3 SO 2 ) salt (LiTFSI) molar ratios EO:Li ranging from 1:1 to pure polymer were prepared by casting solution. The are studied impedance spectroscopy and performed simultaneously optical microscope observation. Star-branched structure does not prevent the without crystallizing. A decrease conductivity caused crystallization is similar order magnitude as in linear PEO. Surprisingly, formed LiTFSI branched inhibited. In ratio equal 10:1 6:1 subjected subsequent cooling heating runs, no traces crystalline phase detected either polarizing observation or differential scanning calorimetry. ionic amorphous state comparable that based on At temperatures below melting temperature matrix, much higher. As prepared, electrolyte also amorphous. Weak segregation effect recorded runs. This behaviour different than observed for ratio, which strongly inhomogeneous contain a large fraction precipitates.
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