Chemical Science Review and Letters ISSN 2278-6783 Chem Sci Rev Lett 2017, 6(21), 166-171 Article CS012048022 166 Research Article Effect of TiO 2 Nano-filler on Dielectric Studies of PVP based Solid Polymer Electrolytes SK. Shahenoor Basha 1 , G. Sunita Sundari 1 , K. Vijay Kumar 2 and M.C. Rao 3 * 1 Solid State Ionics Laboratory, Department of Physics, K. L. University, Guntur - 522502, India 2 Department of Physics, Dayananda Sagar Academy of Technology and Management, Udayapura, Bangalore-560082, India 3 Department of Physics, Andhra Loyola College, Vijayawada- 520008, India Introduction The development of polymer electrolyte systems with high ionic conductivity is one of the main objectives in polymer research. This is because of their potential applications as electrolytes in solid-state batteries, fuel cells, electrochemical display devices/smart windows, photo-electrochemical cells etc., [1-3] due to their high conductivity, high energy density, wide electrochemical stability and easy processibility. Intrinsically conducting polymers have attracted the attention of researchers because of their numerous applications [4, 5]. In recent years tremendous effort has been made in the preparation of solid polymer electrolytes. The recent research trends in the field of rechargeable lithium batteries are directed towards the development of cells with high-energy density (wh/kg) and high-power density. A primary work in the field of solid polymer electrolyte has been carried by Wright et al.[6, 7] and found that the ionic conductivity is the order of 10 -5 S/cm at 330 K in PEO and NaSCN complexes. A wide range of interest has been focused to prepare solid polymer electrolytes over a few decades due to their potential applications as electrolyte materials in high energy density batteries, rechargeable batteries and solid state batteries [8, 9]. Magnesium is used as the excellent material for anode in solid state batteries which is naturally available in earth crust, in addition magnesium based devices are much cheaper than lithium devices, whereas magnesium is less reactive, non-toxic than the lithium in ambient temperatures and atmospheric conditions. So magnesium is used instead of lithium for solid state battery application [10]. Polyvinyl pyrrolidone (PVP) has played major role in displaying dissolubility, stability, high-dielectric constant and compatibility. PVP is soluble in polar solvents as well as in ionized water and also acts as thermally stable, cross linked with the composites and having high mechanical strength. PVP is chosen because it is having good mechanical, electrical and optical characteristics. Pyrrolidone group of PVP prefers to incorporate with organic and inorganic salts resulting in the formation of film which has good dispersion and surface formation[11]. Solid polymer electrolyte complexed with inorganic salt and nano-fillers/plasticizers was first introduced by Weston and Steele in 1982 [12]. The addition of the fillers in the solid polymer electrolytes improves the electrical and mechanical strengths of the polymer [13]. Rao et al. presented their results in their earlier studies [14-27]. In this present work we have reported that the solid polymer electrolyte films were prepared by adding the TiO 2 particles to PVP -MgSO 4 .7H 2 O, the content of this work is to enhance and improve the ionic conductivity by comparing with the other polymer electrolytes. The variation of dielectric properties of the prepared polymer Abstract The logarithmic frequency dependent dielectric behavior of solid polymer electrolyte has been prepared with the combination of PVP (polyvinyl pyrrolidone), Magnesium sulphate heptahydrate (MgSO 4 .7H 2 O) and TiO 2 as nano-filler by solution casting technique. Dielectric studies were performed using AC impedance analyzing technique in the frequency range 42 Hz - 5 MHz. At lower frequency the dielectric studies show the relaxation contribution which is superimposed by the electrode polarization effect. The dielectric constant was found to be increased with increasing the wt% of the sample and the ionic conductivity was higher for 20 wt% MgSO 4 .7H 2 O concentration. Keywords: Polymer electrolytes, PVP, MgSO 4 .7H 2 O, TiO 2 , Ionic Conductivity and Dielectric studies *Correspondence Author:MC Rao Email:raomc72@gmail.com