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The ionic conductivity of the system P(EO) 9 /LiCF 3 SO 3 may be increased by two orders of magnitude at room temperature by adding poly(perfluorinated ethylenmethylenoxide) (PPFEMO). The highest conductivity at 20°C, 4.0×10 −5 Ω −1 cm −1 , was obtained for a ratio PPFEMO/PEO=1.00. The conductivity is enhanced when the amount of plasticizer is increased,...