Investigation of Mg2+ Ion Effect on the Structural Characteristics and Properties of PVDF-HFP Based Solid Polymer Electrolytes for Electrochemical Applications

• Published in: Polymer science. Series A, Chemistry, physics Chemistry, physics, 2022-06, Vol.64 (3), p.194-207
• Main Authors: Mallikarjun, A., Sangeetha, M., Reddy, M. Vikranth, Reddy, M. Jaipal, Kumar, J. Siva, Sreekanth, T.
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Composites; Polymer Sciences
• ISSN: 0965-545X; 1555-6107
• DOI: 10.1134/S0965545X22200019

— In this paper, solid polymer electrolytes comprising of poly(vinylidene fluoride- co -hexafluoropropylene) and Mg(ClO 4 ) 2 were prepared by employing the solution casting technique. The fabricated polymer-salt electrolyte membranes are exposed to XRD, FTIR and SEM studies, which confirm amorphous phase and the presence of interlinked micro-pores promote for easy mobility of Mg 2+ ions that enhances ionic conductivity. The real and imaginary parts of dielectric permittivity are illustrated with the Cole–Cole plot. Static dielectric constant , dynamic dielectric constant , dielectric strength , dielectric loss (tan δ) and relaxation time τ are determined using the Cole–Cole plot, which attributes fast hopping of ions from one site of the polymer chain to another for optimal concentration of polymer electrolyte. The electrochemical properties, such as cell discharge characteristics and cell stability (cyclic voltammetry), are analyzed to favor an electrochemical membrane for battery applications. The activation energy of all the samples is estimated from the DC conductivity data. The frequency-dependent ionic conductivity follows Jonscher’s power law, and the exponent “ n ” shows a dominant long-range pathway and diffusion requisite hopping process for ion transport in polymer electrolytes.