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Synthesis and Compatibility of Ionic Liquid Containing Rod-Coil Polyimide Gel Electrolytes with Lithium Metal ElectrodesA highly cross-linked polyimide-polyethylene oxide copolymer has been synthesized that is capable of holding large volumes of liquid component, simultaneously maintaining good dimensional stability. An amine end capped oligomer was made that was imidized in solution, followed by reaction with a triisocyanate in the presence of desired additives at ambient temperature. Polymer films are able to hold over 4 times their weight in room temperature ionic liquid RTIL or carbonate solvent. Electrolytes were studied that contained varying amounts of RTIL, lithium trifluoromethanesulfonimide LiTFSi, and alumina nanoparticles. Electrochemical stability of these electrolytes with lithium metal electrodes was studied by galvanic cycling and impedance spectroscopy. Improved cycling stability and decreased interfacial resistance were observed when increasing amounts of RTIL and LiTFSi were added. The addition of small amounts of alumina further decreased interfacial resistance by nearly an order of magnitude. During the course of the study, cycling stability increased from less than 3 to greater than 1000 h at 60 C and 0.25 mA/cm2 current density.
Document ID
20090004881
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tigelaar, Dean M.
(NASA Glenn Research Center Cleveland, OH, United States)
Palker, Allyson E.
(NASA Glenn Research Center Cleveland, OH, United States)
Meador, Mary Ann B.
(NASA Glenn Research Center Cleveland, OH, United States)
Bennett, William R.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
August 19, 2008
Publication Information
Publication: Journal of Electrochemical Society
Publisher: Electrochemical Society, Inc.
Volume: 155
Issue: 10
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
E-16876
Funding Number(s)
CONTRACT_GRANT: NNC062A46A
WBS: WBS 561581.02.08.03.15.03
Distribution Limits
Public
Copyright
Other

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