  Present paper reports, the structural, microstructural, electrical,
dielectric properties and ion dynamics of a sodium based solid polymer
electrolyte films comprising of PEO8-NaPF6+ x wt. % SN. The structural and
surface morphology properties have been investigated by XRD and FESEM.
Different microscopic interaction among the polymer, salt and SN have been
analyzed through FTIR. The dielectric permittivity and loss tangent enable us
to estimate the dc conductivity, dielectric strength, double layer capacitance,
and relaxation time. The loss tangent relaxation peak shifts towards
high-frequency side which indicates the decrease of relaxation time and faster
ion dynamics. Further, the relation among various relaxation times ...... has
been developed systematically. The ionic conductivity has been estimated in
whole frequency window including JPL and displays strong dependency on SN
content. The sigma representation ........ has been introduced for exploring
the ion dynamics by highlighting the dispersion region in Cole-Cole plot
(........) at lower frequency window and increase in the radius of semicircle
indicates a decrease of relaxation time. A well convincing/logical scheme has
been proposed which justify the recorded experimental data.
