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Development of Aluminosilicate Polyelectrolytes for Solid-State Battery Applications

Published online by Cambridge University Press:  15 February 2011

Glenn C. Rawsky,
Kevin J. Henretta,
Robert Lowrey,
Duward F. Shrtver and
Semyon Vaynman
Glenn C. Rawsky
Affiliation:
Northwestern University, Department of Chemistry, 2145 Sheridan Road, Evanston, IL 60208-3113
Kevin J. Henretta
Affiliation:
Northwestern University, Department of Chemistry, 2145 Sheridan Road, Evanston, IL 60208-3113
Robert Lowrey
Affiliation:
Basic Industrial Research Laboratory, 1801 Maple Avenue, Evanston, IL 60201-3135
Duward F. Shrtver
Affiliation:
Northwestern University, Department of Chemistry, 2145 Sheridan Road, Evanston, IL 60208-3113
Semyon Vaynman
Affiliation:
Basic Industrial Research Laboratory, 1801 Maple Avenue, Evanston, IL 60201-3135
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Abstract

We have synthesized and characterized a range of novel polyelectrolytes containing weakly basic aluminosilicate anions in the polymer backbone in order to achieve t+ = 1 and high ionic mobility. Room-temperature conductivity is observed to increase in the series: [NaAl(OEOMe)2 ((OE)xO)2/2]n < [NaAl(OR)2(OSiMe2(CH2)3(OE)xO(CH2)3SiMe2O)2/2]n < [NaAl(OSiR3)(OSiMe2(CH2)3(OE)xO (CH2)3SiMe2O)3/2]n. This trend is ascribed to reduced ion pairing due to decreasing anion basicity, and lowered Tg resulting from increasing siloxy character. The addition of cryptand [2.2.2] increases conductivities by 1 -1.5 orders of magnitude. A maximum room-temperature conductivity is observed at a ratio of ≈10 etheric oxygens/cation. Related lithium polymer electrolytes were evaluated in mechanically joined solid state Li |PE |[LixMn2O4-C-PE] cells.

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References

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