Room Temperature Ionic Liquid Electrolytes Based on Azepanium Imide Salts for Lithium Batteries

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DOIResolve DOI: http://doi.org/10.1149/2.102202jes
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TypeArticle
Journal titleJournal of The Electrochemical Society
Volume59
Issue2
PagesA172A176
AbstractIonic liquids based on the imide salts of the dialkyl azepanium cation, AZ (R1, R2) were synthesized, characterized, and evaluated as electrolytes in lithium batteries. Nine salts were synthesized with variation in the length of the two alkyl groups [R1, R2 = methyl (1), ethyl (2), propyl (3) and butyl (4)]. It was found that the asymmetric ones with R2-R1 [equal to or larger than] 2 are liquides at ambient temperature. The tree room-temperature ionic liquids (AZ13-TFSI, AZ14-TFSI, AZ24-TFSI) showed, in the neat form, ionic conductivities in the range of 0.1-0.6 mS/cm, viscosities of 260-350 cP and an electrochemical window of 5.5-6V. It was found that mixing the ionic liquids with ethylene carbonate gave electrolytes with lower viscosities, increased conductivities and improved electrochemical cathodic stability. Electrolytes based on the ILs were evaluated in lithium half cells with different chemistries; Li/LiFePO4, Li/L4Ti5O12, Li/LiCoO2; and in the case of AZ14-TFSI a Li/LiFePO4 cell, gave discharge capacities reaching 125 mAh.g(to the power of)-1 over 100 cycles with 98% coulombic efficiencies.
Publication date
PublisherThe Electrochemical Society
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada
Peer reviewedYes
NRC number53036
NPARC number19335194
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Record identifier96c59f10-ae85-48aa-a448-063089799260
Record created2012-01-27
Record modified2016-05-09
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