SOLID ELECTROLYTES BASED ON POLY(AMIDE 6-B-ETHYLENE OXIDE)

An amide 6-b-ethylene oxide copolymer (Pebax(R)) was investigated as a n ionic conducting matrix. Transparent and flexible films containing L iClO4 were prepared with ionic conductivities in the range of 10(-6) S cm(-1) at room temperature. The conductivity values gradually increas ed when the films were heated (10(-4) S cm(-1) at 100 degrees C). The conductivity dependence on temperature could be described according to the classical Arrhenius plots over the temperature range of 22 to 100 degrees C. The glass transition temperature was determined by differe ntial scanning calorimetry. The T-g of the Pebax/LiClO4 system increas es for samples containing high salt concentration, as expected. The po lymer electrolyte morphology was analyzed by transmission electron mic roscopy. Salt aggregation was observed in all samples. This was confir med by electron spectroscopic images selective for chlorine. The elect rochemical stability window of the Pebax/LiClO4 electrolytes as invest igated by cyclic voltammetry was in the range of 4.0 V.