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Ionically Conducting Glasses with Subambient Glass Transition Temperatures

Published online by Cambridge University Press:  10 February 2011

R. E. Dillon  and
D. F. Shriver
R. E. Dillon
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, Illinois, 60208–3113
D. F. Shriver
Affiliation:
Department of Chemistry and Materials Research Center, Northwestern University, Evanston, Illinois, 60208–3113
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Abstract

Cryptands and crown ethers along with the lithium salt, LiCF3SO2N(CH2)3OCH3 (LiMPSA) were employed to produce a new type of amorphous electrolyte. The key to producing an amorphous phase was the mismatch between the cavity size of the macrocycle and the diameter of the cation. The addition of poly(bis-(2(2-methoxyethoxy)ethoxy)phosphazene) (MEEP) to the amorphous complex, LiMPSA/2.2.2 Cryptand, imparts improved electrochemical and viscoelastic properties. Conversely, when poly(sodium-4-styrenesulfonate) (PS4SS) is added to the amorphous complex, LiMPSA/2.2.2 Cryptand, the product crystallizes. The ionic conductivity of the MEEP rubbery electrolyte is a full order of magnitude higher when compared to the analogous PS4SS doped electrolyte (3.8×10−5 S cm−1 (MEEP), 1.7×10−6 S cm1 (PS4SS) both at 30°K).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 496: Symposium Y – Materials For Electrochemical Energy Storage & Conversion II… , 1997 , 505
Copyright
Copyright © Materials Research Society 1998

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