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Molecules 2009, 14(5), 1840-1851; doi:10.3390/molecules14051840

Synthesis and Properties of Acyclic Ammonium-based Ionic Liquids with Allyl Substituents as Electrolytes

Department of Chemical and Biological Engineering, Research Center for Energy Conversion & Storage, Seoul National University, Seoul 151-744, Korea
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Received: 18 April 2009 / Revised: 12 May 2009 / Accepted: 13 May 2009 / Published: 15 May 2009
(This article belongs to the Special Issue Ionic Liquids)
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Abstract

Several new acyclic ammonium-TFSI ionic liquids with an allyl substituent(s) were synthesized and their physicochemical and electrochemical properties were characterized. [AAMM]Am-TFSI (3) with two allyl groups showed the widest electrochemical stability window (5.9 V) among the ammonium-based ILs reported to date because of the increment of both the anodic and cathodic limits. The charge-discharge performance of a LiCoO2-based half-cell containing [AAMM]Am-TFSI as an electrolyte was better in cycleability (the capacity retention ratio: 99% after 20 cycles) than that of the cell with the corresponding partially saturated analogue, [AMMP]Am-TFSI (2) (the capacity retention ratio: 92% after 20 cycles).
Keywords: ionic liquid; ammonium; bis(trifluoromethanesulfonyl)imide (TFSI); allyl substituent; battery electrolyte ionic liquid; ammonium; bis(trifluoromethanesulfonyl)imide (TFSI); allyl substituent; battery electrolyte
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Yim, T.; Choi, C.Y.; Mun, J.; Oh, S.M.; Kim, Y.G. Synthesis and Properties of Acyclic Ammonium-based Ionic Liquids with Allyl Substituents as Electrolytes. Molecules 2009, 14, 1840-1851.

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