Abstract
New K+ ion-conducting polymer blend electrolyte films based on amorphous polymer poly(vinyl chloride) (PVC) and semicrystalline polymer poly(ethylene oxide) (PEO) complexed with KCl salt were prepared using a solution-cast technique. The maximum value of ionic conductivity of a PVC/PEO:KCl (42.5:42.5:15) system is 8.29×10−6S/cm at 303K. The absorption edge was found at 4.30eV for undoped film, while it was observed at 4.03 and 3.93eV for 10 and 15wt% KCl doped films, respectively. The direct band gaps for these pure and salt doped PVC/PEO films were found to 4.10, 3.86 and 3.74eV, respectively, whereas the indirect band gaps were determined as 4.15, 3.72 and 3.64eV. Transference number values showed that the charge transport in this electrolyte system is predominantly due to ions (tion=0.97). The discharge capacity for PVC/PEO:KCl (42.5:42.5:15) polymer blend electrolyte system is 11μA/h.
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