Journal
JOURNAL OF POWER SOURCES
Volume 178, Issue 2, Pages 779-782Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2007.10.033
Keywords
ionic conductivity; copolymer; ionic liquid; imidazolium cation; quaternary ammonium cation; tricyanomethanide
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Novel lithium polyelectrolyte-ionic liquids have been prepared and characterized of their properties. Poly(lithium 2-acrylamido-2-methyl propanesulfonate) (PAMPSLi) and its copolymer with N-vinyl formamide (VF) also has been prepared as a copolymer. 1-Ethyl-3-methylimidazolium tricyanomethanide (emImTCM) and N,N-dimethyl-N-propyl-N-butyl ammonium tricyanomethanide (N(1134)TCM) which are chosen because of the same with the anion of ionic liquid were prepared. The ionic conductivity of copolymer system (PAMPSLi/PVF/emImTCM: 5.43 x 10(-3) S cm(-1) at 25 degrees C exhibits about over four times higher than that of homopolymer system (PAMPSLi/emImTCM: 1.28 x 10(-3) S cm(-1) at 25 degrees C. Introduction of vinyl formamide into the copolymer type can increase the dissociation of the lithium cations from the polymer backbone. The ionic conductivity of copolymer with emImTCM (PAMPSLi/PVF/emImTCM) exhibits the higher conductivity than that of PAMPSLi/PVF/N(1134)TCM (2.48 x 10(-3) S cm(-1)). Because of using the polymerizable anion it is seen to maintain high flexibility of imidazolium cation effectively to exhibit the higher conductivity. And also the viscosity of emImTCM (19.56 cP) is lower than that of N(1134)TCM (28.61 cP). Low viscosity leads to a fast rate of diffusion of redox species. (C) 2007 Elsevier B.V. All rights reserved.
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