  In the present work, the effect of different nanofiller (BaTiO3, CeO2, Er2O3
or TiO2) on blend solid polymer electrolyte comprising of PEO and PVC complexed
with bulky LiPF6 have been explored. The XRD analysis confirms the polymer
nanocomposite formation. FTIR provides evidence of interaction among the
functional groups of the polymer with the ions and the nanofiller in terms of
shifting and changing peak profile. The highest ionic conductivity is ~2.3x10-5
S cm-1 with a wide electrochemical stability window of ~3.5 V for 10 wt. %
Er2O3. The real and imaginary part of dielectric permittivity follows the
identical trend of the decreasing value with increase in the frequency. The
particle size and the dielectric constant shows an abnormal trend with
different nanofiller. The ac conductivity follows the universal power law. An
effective mechanism has been proposed to understand the nanofiller interaction
with cation coordinated polymer in the investigated system.
