Ionic conductivity and dielectric studies of LiClO₄ doped poly(vinylalcohol)(PVA)/chitosan(CS) composites

Abstract

This paper focuses on the dielectric constant (" 0 ), dielectric loss factor (" 00 ) and frequency dependent conductivity ( ac ) properties of newly prepared poly(vinylalcohol) (PVA) chitosan (CS) composite films incorporated with different concentrations of LiClO 4 . The composite films were prepared using solution casting technique. The complexation between salt and polymer host is confirmed by FT Raman and UV-Vis studies. The sample containing 20 wt.% LiClO 4 exhibits a highest ionic conductivity of 3 Â 10 À6 S/cm at room temperature. The dielectric properties of the composites follow non-Debye behavior.

Effects of the electrolyte content on the electrical permittivity, thermal stability, and optical dispersion of poly(vinyl alcohol)–cesium copper oxide–lithium perchlorate nanocomposite solid‐polymer electrolytes

“…The measured σ ac at log f max is summarized in Table . The maximum conductivity obtained in this research investigation was 1.7 × 10 −5 S/cm for PVA and 2 wt % Cs 2 CuO 2 –15 wt % LiClO 4 , and it was very close to the result reported for a PVA and chitosan blend doped with 20 wt % LiClO 4 , whose maximum conductivity was 3.81 × 10 −5 S/cm …”

Impedance spectroscopy, ionic conductivity and dielectric studies of new Li+ ion conducting polymer blend electrolytes based on biodegradable polymers for solid state battery applications

“…ions with hydroxyl group of PVA and carbonyl group of PVP which forms charge transfer complexes and acts as hoping sites for Li ? ions to migrate into PVA/PVP blend and expected to reduce the trapping sites to create path through the amorphous phase of the polymer matrix and this favours the ionic conductivity [53]. Also, it can be seen that the ionic conductivity decreases at higher salt concentration, i.e.…”

“…With an increase in temperature, the crystalline phase of polymer matrix dissolves progressively into amorphous phase with the increase in temperature. This, in turn, influences the hopping and thus increases the dielectric constant [53]. This behaviour is typical of polar dielectrics because dipole orientation is facilitated by increasing the temperature, thus increasing the dielectric constant [61].…”

Vibrational, electrical, dielectric and optical properties of PVA-LiPF6 solid polymer electrolytes

“…Rathod et al [11], Rajeswari et al [12] and Varishetty et al [13] investigated PVA based lithium ion conducting polymer electrolytes and obtained highest conductivity in the range of 10 −6 S·cm −1 to 10 −4 S·cm −1 at ambient temperature. Ibrahim et al [18] studied PEO complexed with LiPF 6 and obtained conductivity of 6.75 × 10 −5 S·cm −1 at 303 K. Liew et al [19] studied PEO complexed with LiPF 6 and obtained the maximum conductivity value of 6.0 × 10 −6 S·cm −1 at 383 K. In that research, conductivity of pure PVA was found to be 4.64 × 10 −6 S·cm −1 at 303 K and the value increased gradually to 8.94 × 10 −3 S·cm −1 , when 20 mol% LiPF 6 was added into the PVA.…”

“…Hence, PVA based electrolytes have been extensively studied in the last two decades. Many research investigations have been dedicated to develop proton conducting [3][4][5][6][7][8] as well as Mg 2+ [9], Cu 2+ [10] Li + [11][12][13][14] and Ag 2+ ion conducting [15] electrolytes using PVA as a host polymer.…”