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Vibrational and Impedance Spectroscopic Analyses of Semi-Interpenetrating Polymer Networks as Solid Polymer Electrolytes

Abstract

Semi-interpenetrating polymer networks (semi-IPN) with significant ionic conductivity (10-4 S cm-1 at ambient temperature) were studied by vibrational and impedance spectroscopies coupled with advanced analysis procedures. Vibrational spectroscopy recognized the amount of free ions, ion pairs, ion-polymers and hydrogen bonding within the solid polymer electrolyte matrices (SPE). Electrochemical impedance spectroscopy (EIS) was used to quantify the bulk resistance and bulk relaxation time. The analyses used discrepancy-complexity plots to assess the number of free parameters properly, and EIS was further analyzed using impedance spectroscopy genetic programming (ISGP). Four compositions of PEO-polyurethane/ Poly(ethylene glycol) dimethyl ether (PEO-PU/PEGDME) where examined with LiClO4 salt. The polymer electrolyte composition of 30/70 PEO-PU/PEGDME resulted with the lowest relaxation times and highest ionic conductivity. The best salt concentration was observed at EO/Li ratio of 30 for the PEO-PU/PEGDME: LiClO4 (30/70) semi-IPN matrix. Several lithium salts of different anions were examined at EO/Li ratio of 10, and the ionic conductivity achieved varied in the order -N(CF3SO2)2- >-ClO4- > (CF3SO3)- >-I-/I3-.

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Publication details

The article was received on 07 Jan 2017, accepted on 09 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7CP00129K
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Vibrational and Impedance Spectroscopic Analyses of Semi-Interpenetrating Polymer Networks as Solid Polymer Electrolytes

    N. Bar, P. Basak and Y. Tsur, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP00129K

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