Dielectric Studies of [PEO: CH3COOLi]: Graphite System Synthesized by Hot Press and Solution Cast Technique

Abstract

Present paper deals with the study of dielectric properties in polyethylene oxide (PEO)—based polymer electrolytes subsequent to dispersal of graphite filler particles synthesized by hot press and solution cast technique. The formation of nanocomposites and changes in the structural and microstructural properties of the materials were investigated by X-ray diffraction, Infrared measurements and optical microscopy. A decrease in crystanillity or increase in amorphousity was found to be more for solution cast film in comparison to hot press film. Electrical and thermal properties of PEO based polymer electrolyte film are found to be enhanced with the addition of graphite powder not only by solution cast method but also by hot press method. The conductivity for film prepared by solution cast method was found be in the range of 10−2 S/cm whereas for film prepared by hot press method the conductivity was found to be in the range of 10−4 S/cm at increasing temperature. The dielectric behavior is analyzed using the dielectric permittivity (e’ and e’’) and tangent loss (tan δ). It is found that the dielectric permittivity (e’ and e’’) rises sharply towards low frequencies and maxima of tangent loss shifts towards higher frequencies for both the films.