The conducting polymer electrolyte films consisting of polyacrylonitrile (PAN) as the host polymer, lithium triflate (LiCF 3 SO 3 ) and sodium triflate (NaCF 3 SO 3 ) as inorganic salts were prepared by the solution-cast technique. The pure PAN film was prepared as a reference. The ionic conductivity for the films is characterized using impedance spectroscopy. The room temperature conductivity for the PAN+26 wt.% LiCF 3 SO 3 film and the PAN+24 wt.% NaCF 3 SO 3 film is 3.04×10 −4 S cm −1 and 7.13×10 −4 S cm −1 , respectively. XRD studies show that the complexation that has occurred in the PAN containing salt films and complexes formed are amorphous. The FTIR spectra results confirmed the complexation has taken place between the salt and the polymer. These results correspond with surface morphology images obtained from SEM analysis. The conductivitytemperature dependence of the highest conducting film from PAN + LiCF 3 SO 3 and PAN + NaCF 3 SO 3 systems follows Arrhenius equation in the temperature range of 303 to 353 K. The PAN containing 24 wt.% LiCF 3 SO 3 film has a higher ionic conductivity and lower activation energy compared to the PAN containing 26 wt.% LiCF 3 SO 3 film. These results can be explained based on the Lewis acidity of the alkali ions, i.e., the interaction between Li + ion and the nitrogen atom of PAN is stronger than that of Na + ion.
In the present work, five systems of samples have been prepared by the solution casting technique. These are the plasticized poly(methyl methacrylate) (PMMA-EC) system, the LiCF 3 SO 3 salted-poly(methyl methacrylate) (PMMA-LiCF 3 SO 3 ) system, the LiBF 4 salted-poly(methyl methacrylate) (PMMA-LiBF 4 ) system, the LiCF 3 SO 3 salted-poly(methyl methacrylate) containing a fixed amount of plasticizer ([PMMA-EC]-LiCF 3 SO 3 ) system, and the LiBF 4 salted-poly(methyl methacrylate) containing a fixed amount of plasticizer ([PMMA-EC]-LiBF 4 ) system. The conductivities of the films from each system are characterized by impedance spectroscopy. The room temperature conductivity in the pure PMMA sample and (PMMA-EC) system is 8.57×10 −13 and 2.71×10 −11 S cm −1 , respectively. The room conductivity for the highest conducting sample in the (PMMA-LiCF 3 SO 3 ), (PMMALiBF 4 ), ([PMMA-EC]-LiCF 3 SO 3 ), and ([PMMA-EC]-LiBF 4 ) systems is 3.97×10 −6 , 3.66×10 −7 , 3.40×10 −5 , and 4.07×10 −7 S cm −1 , respectively. The increase in conductivity is due to the increase in number of mobile ions, and decrease in conductivity is attributed to ion association. The increase and decrease in the number of ions can be implied from the dielectric constant, ɛ r -frequency plots. The conductivity-temperature studies are carried out in the temperature range between 303 and 373 K. The results show that the conductivity is increased when the temperature is increased and obeys Arrhenius rule. The plots of loss tangent against temperature at a fixed frequency have showed a peak at 333 K for the ([PMMA-EC]-LiBF 4 ) system and a peak at 363 K for the ([PMM-EC]-LiCF 3 SO 3 ) system. This peak could be attributed to β-relaxation, as the measurements were not carried out up to glass transition temperature, T g . It may be inferred that the plasticizer EC has dissociated more LiCF 3 SO 3 than LiBF 4 and shifted the loss tangent peak to a higher temperature.
Magnesium-ion conducting gel polymer electrolytes (GPEs) based on PMMA with ethylene carbonate (EC) and propylene carbonate (PC) as a plasticizing solvent were prepared via the solution casting technique. Mg(CF3SO3)2 salt was used as source of magnesium ions, Mg2+. The variation of conductivity with salt concentrations, from 5 wt.% to 30 wt.% was studied. The gel polymer electrolyte with composition 20 wt.% of Mg(CF3SO3)2 exhibited the highest conductivity of 1.27 x 10-3 S cm-1 at room temperature. The conductivity-temperature dependence of gel polymer electrolyte films obeys Arrhenius behaviour with activation energy in the range of 0.18 eV to 0.26 eV. Ionic transport number was evaluated using DC polarization technique and it reveals the conducting species are predominantly ions. It is found that the ionic conductivity and transport properties of the prepared GPEs are consistent with the X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) studies.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.