Abstract
The effects of room-temperature molten salt addition on electrochemical properties of polymer composite electrolytes (PCE) based on poly(ethylene oxide) (PEO) were studied. Alkyl-imidazolium salt, 1-butyl-3-methyl-imidazolium hexafluorophosphate (BMIPF6) could influence ion transference phenomena, resulting the change of ionic conductivity of PCE. The PCE containing 1.2 mole% BMIPF6 showed the slightly lower melting temperature than PEO-LiClO4. The PCE showed the highest ion conductivity of 2.9 * 10(-4) S/cm, which is one-order-of-magnitude higher value than the pristine sample. This is probably originated from the improved ion transference and slightly decreased crystallinity. Li ion transference number was increased to 0.55 and the stable electrochemical voltage limit was upgraded to approximately 4.3 V. Consequently, the ion conducting behaviors and the electrochemical stability had been improved by BMIPF6 addition.
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