Proceedings of the Polymer Society of Korea Conference (한국고분자학회:학술대회논문집)

The Polymer Society of Korea (한국고분자학회)
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Electrochemical properties of PEO-based solid polymer electrolytes blended with different room temperature ionic liquids

  • Kim, Y.H. (Department of Chemical and Biological Engineering, ITRC for Energy Storage and Conversion) ;
  • Cheruvally, G. (Department of Chemical and Biological Engineering, ITRC for Energy Storage and Conversion) ;
  • Choi, J.W. (Department of Chemical and Biological Engineering, ITRC for Energy Storage and Conversion) ;
  • Ahn, J.H. (Department of Chemical and Biological Engineering, ITRC for Energy Storage and Conversion) ;
  • Kim, K.W. (Division of Advanced Materials Science and Engineering, Gyeongsang National University) ;
  • Ahn, H.J. (Division of Advanced Materials Science and Engineering, Gyeongsang National University) ;
  • Song, C.E. (Institute of Basic Science, Department of Chemistry, Sungkyunkwan University) ;
  • Choi, D.S. (Institute of Basic Science, Department of Chemistry, Sungkyunkwan University)
  • Published : 2006.10.13
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Abstract

The incorporation of room temperature ionic liquids (IL) in poly (ethyleneoxide)-lithium salt (PEO-LiX) based solid polymer electrolytes is presently being studied as an effective means of enhancing the room temperature ionic conductivity of these electrolytes to acceptable levels for use in lithium batteries. In the present study, $PEO_{20}-LiTFSI$ solid polymer electrolyte was blended with three different ionic liquids, namely 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (BMIMTFSI), 1-butyl-3-methylimidazolium tetraflouroborate (BMIMBF4) and 1-butyl-3-methylimidazolium trifluromethanesulfonate ($BMIMCF_{3}SO_{3}$). The incorporation of all these ILs resulted in the enhancement of ionic conductivity, the effect being more pronounced at lower temperatures. Electrochemical properties of the blended electrolytes were studied by cyclic voltammetry, linear sweep voltammetry and interfacial resistance measurements. The optimum results were obtained with the blending of BMIMTFSI in the solid polymer electrolyte.

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