Ionic conductivity of a polymer electrolyte with modified carbonate as a plasticizer for poly(ethylene oxide)

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2054852· OSTI ID:7200872

Lee, H S; Yang, X Q; McBreen, J ^[1]; Xu, Z S; Skotheim, T A ^[2]; Okamoto, Y ^[3]

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1. Brookhaven National Lab., Upton, NY (United States)
2. Moltech Corp., Stony Brook, NY (United States)
3. Polytechnic Univ., Brooklyn, NY (United States)

A new type of plasticizer, a modified carbonate (MC3) made by attaching three ethylene oxide units to the 4-position of ethylene carbonate, has been synthesized. The ionic conductivity of a polymer electrolyte using this type of plasticizer in a poly(ethylene oxide) (PEO)-LiCF[sub 3]SO[sub 3] complex has been studied. Adding 50% of this plasticizer by weight of PEO to the PEO-LiCF[sub 3]SO[sub 3] complex, yielded an ionic conductivity of 5 [times] 10[sup [minus]5] S/cm at 25 C, which is two orders of magnitude higher than that found for a PEO-LiCF[sub 3]SO[sub 3] electrolyte without a plasticizer, and one order of magnitude higher than that found when using propylene carbonate (PC) as a plasticizer. The temperature dependence of the conductivity and thermal analysis results indicate that this new plasticizer increases the ionic conductivity throughout the entire complex system, whereas conventional plasticizers, like PC, simply create a high conductivity pathway through the plasticizer itself. The new plasticizer also enhances the ion pair dissociation which in turn improves the ionic conductivity.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7200872
• Journal Information: Journal of the Electrochemical Society; (United States), Vol. 141:4; ISSN 0013-4651
• Country of Publication: United States
• Language: English

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25 ENERGY STORAGE
36 MATERIALS SCIENCE
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LITHIUM COMPOUNDS
PLASTICIZERS
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