Journal
ELECTROCHIMICA ACTA
Volume 51, Issue 13, Pages 2614-2619Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2005.07.043
Keywords
ionic liquid; ionic conductivity; polymer electrolyte; lithium ion
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Several onium cations having vinyl group formed ionic liquids after coupling with bis(trifluoromethanesulfonyl)imide. These monomers were polymerized, and the relation between onium cation structure and properties of thus polymerized ionic liquids was investigated. The polymerized ionic liquid having ethylimiadzolium cation unit showed the highest ionic conductivity of around 10(-4) Scm(-1) at 30 degrees C among the obtained polymers reflecting the lowest glass transition temperature of -59 degrees C. These polymers were thermally stable and their decomposition temperatures were about 350 degrees C. The ionic conductivity of the polymerized ionic liquids decreased by both the addition of lithium bis(trifluoromethanesulfonyl)imide and the polymerization in the presence of cross-linker. However, the polymerized ionic liquid having 1-methylpiperidinium cation structure showed good lithium ion transference number of 0.43 at room temperature. (c) 2005 Elsevier Ltd. All rights reserved.
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