Department Of Physics
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Item Dielectric study of polymer nanocomposite films for energy storage applications(Springer Science and Business Media, LLC, 2017) Sadiq, M.; Arya, Anil; Sharma, Achchhe LalIn the present study we have a novel report on the types of dielectric studies of the two blend polymer consisting of polyacrylonitrile (PAN) as the host polymer-polyethylene oxide (PEO) as a copolymer, LiPF6 as lithium salts and clay containing different weight percent of DMMT as modified montmorillonite. The polymer nanocomposite (PNC) films were prepared by using solution cast technique. However the pure PAN-PEO+LiPF6 film was prepared as a reference. Keeping in view of characterization of PNCs films were study by impedance spectroscopy technique. The high frequency range of dielectric measurement is 1 Hz-1 MHz. This technique is shown to be a viable and straight forward means of obtaining dielectric data on polymer electrolytes. Permittivity (??), dielectric loss (??) and a.c. conductivity variation with frequency was studied to estimate the relaxation times for PAN-PEO polymer electrolyte. ? Springer International Publishing Switzerland 2017.Item Correlation of microscopic interaction with electrical conductivity in polymer separator of energy storage devices(Springer Science and Business Media, LLC, 2017) Sharma, Parul Kumar; Sharma, Anshul Kumar; Sadiq, M.; Sharma, A. L.In the present report solid polymer nanocomposite (PNCs) comprising of (PEO)14+ NaClO4+ wt% BaTiO3has been prepared by solution casting method. Important characterization like: FTIR (Fourier Transform Infrared Spectroscopy), and conductivity have been performed for the applicability of the prepared materials in device application. The highest conductivity of the prepared polymer nanocomposite materials has been estimated 1?10?4Scm?1for 15 wt% of BaTiO3. A very fine correlation has been built among polymer-ion, ion-ion and polymer ion interaction with obtained conductivity results. ? Springer International Publishing Switzerland 2017.Item Transport Properties of Solid Polymer Nanocomposite Films for Energy Device Applications(NIT Srinagar, 2016) Sadiq, M.; Sharma, A. L.Sample preparation of high quality new series polymer nanocomposite (PNC) films based on (PAN-PEO)-LiPF 6 +xwt. %DMMT has been prepared via solution cast technique. Keeping in view of applications of solid state PNC films, Fourier transform infrared (FTIR) spectroscopy is done for understanding of microscopic interaction among the different composite component present in the material system. The impedance and electrochemical analysis have been done to fulfill the objective of the materials for the energy storage/conversion device applications. Thermo gravimetric analysis (TGA) has been done to estimate the thermal stability of the prepared polymer nanocomposite films.Item Optimization of Free standing Polymer Electrolytes films for Lithium ion batteries application(Integrated Science, 2016) Sadiq, M.; Arya, Anil; Sharma, A. L.The free standing polymer nancomposite films consisting of blend polymer based on Poly(acrylonitrile) (PAN) as host polymer–Poly(ethylene oxide)(PEO) as a copolymer, Dimethylformamide (DMF) as solvent and Lithium hexaflourophosphate (LIPF6) as a conducting speciesm were prepared. Keeping in view of characterization of solid state film such as, Fourier transform infrared (FTIR) spectroscopy is done for an understanding of the microscopic interaction among the different component present in the material system. The energy storage/conversion device applications have been analyzed by the impedances spectroscopy. The surface morphology or micro-structural of the polymer nanocomposite electrolytes film was analyzed by FESEM. The electrochemical stability window was about ~4V for the polymer electrolyte film at (/Li=6). The advantageous outcome of PAN combining with PEO based electrolytes is in comparable electrical conductivity and wider electrochemical stability window. Further optimization might lead to practical solid state polymer electrolytes for lithium ion batteries.Item Effect of Nano filler on PEO based polymer electrolytes for energy storage devices applications(Intergated Science, 2017) Sharma, P. K.; Sharma, A. K.; Sadiq, M.; Sharma, A. L.Ionically conducting solid polymer films have been utilized in many energy related sectors like high energy density solid polymer batteries, PEM fuel cells, and super capacitors, etc.In the present study, we report innovative study on the prepared high quality solid state free standing thin polymeric separator. In prepared free standing polymeric separator, polymer (PEO) has been used as host matrix; appropriate bulky anion salt (NaClO 4 ) as conducting species and nano ceramic filler (BaTiO 3 ) is used to enrich the mechanical and thermal stability of separator used for the device applications. The Fourier Transform Infra-Red (FTIR) result has been analysed properly of the prepared materials to look the microscopic interaction among polymer-ion, ion-ion and polymer-ion-filler interaction. Electrical conductivity results has been recorded using the impedance spectroscopy results which gives the estimated value of the order of ~10 Scm of the nano ceramic doped polymeric separator which is desirable for energy storage application. A fine correlation has been established between the electrical conductivity and FTIR results analysisItem Electrical Conductivity and Ion Transport Number Analysis of Polymer Nanocomposite Films(The Research Publication, 2016) Sharma, Parul Kumar; Sharma, Anshu Kumar; Sadiq, M.; Sharma, A. L.Solid state free standing polymer nanocomposite films have been used in numerous vitality related segments like: high energy density solid polymer batteries, PEM fuel cells, super capacitors, etc. Such applications require a desirable conductivity value of the order of ~10-3 Scm-1at room temperature. A free standing transparent film of solid state polymer electrolyte based on PEO+ LiPF6 with different compositions of nano sized filler (BaTiO3) in weight percent (x = 0, 1, 2, 5, 10, 15, 20 ) is synthesized by using standard solution cast technique. Surface morphology of the prepared polymer composition is examined by field emission scanning electron microscopy (FESEM). I-V characteristics of the prepared sample have been characterized for the stability of electrochemical potential window. The transport number analysis of prepared sample has been done to separate out the contribution due to ions and electrons in the electrical conductivity results. The transference number has been estimated and found of the order of ~94%.Item Correlation of ion-ion interaction with electrical conductivity in solid state polymeric separator for energy storage applications(American Institute of Physics Inc., 2016) Sharma, Parul Kumar; Sadiq, M.; Bhatt, Chandni; Sharma, A. L.In the present study, we report innovative study on the prepared high quality solid state free standing thin polymeric separator. In prepared free standing polymeric separator, polymer (PEO) has been used as host matrix; appropriate bulky anion salt (LiPF6) as conducting species and Nano ceramic filler (BaTiO3) is used to enrich the mechanical and thermal stability of separator used for the device applications. The Fourier Transform Infra-Red (FTIR) result has been analysed properly of the prepared materials to look the microscopic interaction among polymer-ion, ion-ion and polymer-ion-clay interaction. Electrical conductivity results has been recorded using the impedance spectroscopy results which gives the estimated value of the order of ?10-3 Scm-1 of the nano ceramic doped polymeric separator which is desirable for energy storage application. A fine correlation has been established between the obtained results by this two analysis. ? 2016 Author(s).Item Role of salt concentration in blend polymer for energy storage conversion devices(American Institute of Physics Inc., 2016) Arya, A.; Sadiq, M.; Sharma, A. L.Solid Polymer Electrolytes (SPE) are materials of considerable interest worldwide, which serves dual purpose of electrolyte and separator between electrode compartments in renewable energy conversion/storage devices such as; high energy density batteries, electrochromic display devices, and supercapacitors. Polymer blend electrolytes are prepared for various concentration of salt (?/Li) with the constant ratio (0.5 gm) of each PEO and PAN polymers (blend polymer) using solution casting technique. Solid polymeric ionic conductor as a separator is the ultimate substitute to eliminate the drawback related to liquid and gel polymer ionic conductors. In the present work, solid polymer electrolyte film consisting of PEO, PAN and LiPF6 are examined for various concentration of lithium salt by keeping PEO/PAN blend ratio as a constant with a view to optimize the dominant salt concentration which could give the maximum conductivity at ambient temperature. ? 2016 Author(s).