Characterization of poly(vinyl alcohol)/potassium chloride polymer electrolytes for electrochemical cell applications

Abstract

A solid polymer electrolyte system based on poly(vinyl alcohol) (PVA) complexed with potassium chloride (KCl) salt was prepared by using solution cast technique. The complexation of KCl salt with the polymer was confirmed by X‐ray diffractrometer and Fourier transform infrared spectroscopy. Differential scanning calorimetry was used to determine the melting temperatures and crystallinity of the pure PVA and complexed films. Ionic conductivities of the electrolytes have been determined by AC impedance studies in the temperature range 303–373 K. The conductivity was found to increase with the increase in dopant concentration and temperature. Transference number data suggests that the charge transport in this polymer electrolyte system is mainly due to ions. Optical absorption studies were made in the wavelength range 200–800 nm on pure and KCl doped PVA films. The absorption edge, direct band, and indirect band gap values were evaluated. It was found that the energy gaps and band edge values shifted to lower energies on doping. Electrochemical cells were fabricated with the configuration of K/(PVA + KCl)/(I2 + C + electrolyte) and discharge characteristics were studied under a constant load of 100 kΩ. Various cell parameters, such as open circuit voltage, short circuit current, power density, and energy density were determined. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers

Structural, Thermal and Optical Properties of Pure and Mn2+ Doped Poly(Vinyl Chloride) Films

“…Using this technique, the glass transition temperature (T g ) as well as melting temperature (T m ) and degree of crystallinity of the material can be identified. Figure 1 From Figure 1 it can be seen that all the samples exhibit only one T g which indicates the homogeneous behaviour of polymer film 21 . An endothermic peak has been observed around 280 o C and 300 o C for pure, and Mn 2+ doped PVC films respectively, which corresponds to the dehydrochlorination of PVC.…”

“…An endothermic peak has been observed around 280 o C and 300 o C for pure, and Mn 2+ doped PVC films respectively, which corresponds to the dehydrochlorination of PVC. A slight shift of T m towards higher temperature on the addition of Mn 2+ ions to the polymer reveals the disruption of crystallinity of the polymer 21 . On increasing doping concentration, the broadening of the melting endothermic peak is a clear indication of decrease in the degree of crystallinity and dominant presence of amorphous phase 22 .…”

Spectroscopic analysis of CdCl2 doped PVA–PVP blend films

“…Incorporation of metal salt in a polymeric system could result in microstructural changes in the host polymer, and consequently, this affects the physical and chemical properties of the polymeric material. Researchers have studied the effect of inorganic salts on the microstructure and properties of hydrophilic polymeric materials [5][6][7][8].…”

Thermal and Conductivity Studies of VO2+ Doped Methacrylic Acid - Ethyl Acrylate (MAA:EA) Copolymer Films

“…The decrease in the bulk resistance of the polymer electrolyte is due to enhancement of the ionic mobility and the number of carrier ions with concentration of the dopant, resultantly semi -circular form is lost similar trend was observed by Pavani et. al 9 . The presence of the depressed semi circle reveals the non-Debye nature of the sample 14 due to the potential well for each site, through which the ion transport takes place, not being equal.…”

“…Using this technique, the glass transition temperature (T g ) as well as melting temperature (T m ) of the material can be identified 9 . Figure ( doped MAA: EA copolymer samples having only one T g indicates homogeneous behavior of the copolymer films.…”