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Electrochemical Properties of PEO‐Based Polymer Electrolytes Blended with Different Room Temperature Ionic Liquids
Author(s) -
Kim Yeon Hwa,
Cheruvally Gouri,
Choi Jae Won,
Ahn Jou Hyeon,
Kim Ki Won,
Ahn Hyo Jun,
Choi Doo Seong,
Song Choong Eui
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200750330
Subject(s) - ionic liquid , sulfonyl , ionic conductivity , lithium (medication) , electrochemistry , materials science , ethylene oxide , electrochemical window , electrolyte , trifluoromethanesulfonate , imide , tetrafluoroborate , polymer chemistry , thermal stability , polymer , inorganic chemistry , chemical engineering , chemistry , copolymer , organic chemistry , alkyl , electrode , composite material , medicine , engineering , endocrinology , catalysis
Polymer electrolyte (PE) based on poly(ethylene oxide)‐lithium bis(trifluoromethane sulfonyl)imide (PEO‐LiTFSI) was blended with three room temperature ionic liquids (RTILs), namely 1‐butyl‐3‐methylimidazolium bis(trifluoromethane sulfonyl)imide (BMITFSI), 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIBF 4 ) and 1‐butyl‐3‐methylimidazolium trifluoromethanesulfonate (BMICF 3 SO 3 ) with a view to enhance the room temperature ionic conductivity to acceptable levels for use in lithium batteries. The incorporation of 80 parts by weight (pbw) of the RTILs in 100 pbw of PEO‐LiTFSI resulted in enhanced ionic conductivity, the effect being more pronounced at lower temperatures. Evaluation of electrochemical properties showed that PEs with RTILs exhibit an electrochemical stability window between −1.0 V and 4.5 V vs Li/Li + and good reversibility of redox reactions on cycling. The optimum results were obtained with the incorporation of BMITFSI in the PE, which exhibited a low and stable interfacial resistance on lithium metal.