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Slow recrystallization in the polymer electrolyte system poly(ethylene oxide)n–LiN(CF3SO2)2

Published online by Cambridge University Press:  31 January 2011

Ludvig Edman ,
Anders Ferry  and
Marca M. Doeff
Ludvig Edman
Affiliation:
Lawrence Berkeley National Laboratory, Materials Science Division, University of California, Berkeley, California 94720
Anders Ferry
Affiliation:
Department of Materials Engineering, Monash University, Clayton, 3168 VIC, Australia
Marca M. Doeff
Affiliation:
Lawrence Berkeley National Laboratory, Materials Science Division, University of California, Berkeley, California 94720
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Abstract

Thermal and ion-transport properties of the salt-in-polymer system poly(ethylene oxide)n–LiN(CF3SO2)2 [P(EO)nLiTFSI] were investigated for compositions ranging from n = 5 to n = 50. Particular attention was paid to the region n = 8 to 10 where a crystallinity gap previously had been reported. We concluded that the absence of distinct melting transitions for salt-rich compositions (n = 5 to 12) was attributable to the extremely slow kinetics of recrystallization of this system following a heat treatment. The results further indicated that it was primarily the nucleation process that was inhibited by the [(bis)trifluoromethanesulfonate imide] (TFSI) anion. As a corollary, the ionic conductivity was strongly dependent on the thermal history of samples, and an enhancement of up to 300% was observed in the ambient temperature ionic conductivity for pre-heated salt-rich samples.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 9 , September 2000 , pp. 1950 - 1954
Copyright
Copyright © Materials Research Society 2000

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