Effect of TiO2 Nano-Filler on Electrical Properties of Na+ Ion Conducting PEO/PVDF Based Blended Polymer Electrolyte

• Published in: Journal of inorganic and organometallic polymers and materials Vol. 31; no. 8; pp. 3430 - 3440
• Main Authors: Ganta, Kiran Kumar, Jeedi, Venkata Ramana, Katrapally, Vijaya Kumar, Yalla, Mallaiah, Emmadi, Laxmi Narsaiah
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.08.2021; Springer Nature B.V
• Subjects: Ambient temperature; Chemistry; Chemistry and Materials Science; Dielectric relaxation; Electrical properties; Electrochemical impedance spectroscopy; Electrolytes; Ethylene oxide; Fillers; Inorganic Chemistry; Ion currents; Ions; Mathematical analysis; Nanocomposites; Organic Chemistry; Polymer films; Polymer Sciences; Polymers; Power law; Sodium; Sodium perchlorate; Spectrum analysis; Titanium dioxide; Vinylidene; Vinylidene fluoride; nano-filler; SEM; TiO; XRD; Ionic conductivity; Electrochemical impedance spectroscopy
• ISSN: 1574-1443; 1574-1451
• DOI: 10.1007/s10904-021-01947-w

Nanocomposite polymer electrolyte (NCPE) films based on a blend of two polymers poly (ethylene oxide) (PEO) and poly (vinylidene fluoride) (PVDF) complexed with sodium perchlorate (NaClO 4 ) salt and Nano-filler titanium dioxide (TiO 2 ) (i.e., (80 wt% PEO/20 wt% PVDF) + 7.5 wt% NaClO 4  + x wt% TiO 2 where x = 3, 6, 9, 12, 15, and 18) were prepared and characterized as potential candidates for battery applications. Electrochemical impedance spectroscopy (EIS) has been employed between the frequencies 10 Hz and 4 MHz to investigate electrical, dielectric and electric modulus properties of the prepared NCPE films. Effect of TiO 2 Nano-filler concentration on the structural, ionic conductivity, and dielectric relaxation has been studied. The AC conductivity of the NCPE films at high frequencies obeys Jonscher’s power law. The values of DC ionic conductivity calculated by fitting the AC conductivity spectra to the best fit of Joncher’s power law are consistent with the values of DC ionic conductivity calculated from the bulk resistance ( R b ) of the NCPE films. The ionic conductivity that depends on temperature follows the Arrhenius rule between the temperatures 298 and 328 K. The maximum ionic conductivity at ambient temperature 8.75 × 10 –5 S/cm was obtained for (80 wt% PEO/20 wt% PVDF) + 7.5wt% NaClO 4  + 15 wt% TiO 2 NCPE film and it is attributed to the decrease in crystallinity. Using Wagner’s polarization technique ionic transport numbers of various NCPE films were measured.