A comparative study of lithium and sodium salts in PAN-based ion conducting polymer electrolytes

Abstract

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.

Dielectric and thermal response of poly[(vinylidene chloride)-co -acrylonitrile]/poly(methyl methacrylate) blend membranes

“…Figure presents the FTIR characteristic spectra of the blends, as a function of blend composition. The strong stretching vibration of nitrile group (CN) of PVdC‐AN is observed at 2245 cm −1 in the spectra of the complexes . In methacrylate‐based electrolytes, the lithium ions associate with oxygen atoms, whereas in acrylonitrile‐based electrolytes the Li + ions associate with nitrogen atoms since the nitrile is a strong electron dopant.…”

“…The strong stretching vibration of nitrile group (C≡N) of PVdC-AN is observed at 2245 cm −1 in the spectra of the complexes. 31 In methacrylate-based electrolytes, the lithium ions associate with oxygen atoms, whereas in acrylonitrile-based electrolytes the Li + ions associate with nitrogen atoms since the nitrile is a strong electron dopant. It is clear that, when the content of PVdC-AN in the PVdC-AN/PMMA blends decreases, the transmittance intensity of the C≡N group in PVdC-AN also decreases, being explained by the interaction between functional groups of both polymers which may vary with the composition of the blend.…”

Ionic conductivity and battery characteristic studies of a new PAN-based Na+ ion conducting gel polymer electrolyte system

“…The literature survey indicates that only a few attempts have been made using sodium salt-doped PAN-based polymer electrolytes. Osman et al [16] have made a comparative study of lithium and sodium triflates in PAN-based ion conducting polymer electrolytes and found higher ionic conductivity and lower activation energy for sodium triflate-doped films than for lithium triflate-doped films.…”

Synthesis of Bendable Plasticized Nanocomposite Polymer Electrolyte Using Poly(Acrylonitrile)/Poly (Methyl Methacrylate) Polymer Blends

“…The vibrational band at 2249 cm −1 corresponds to the stretching vibration of nitrile band (C≡N) of PAN which is shifted towards the lower frequency side in all the complexes. This is due to the inductive effect created by the interaction between the nitrogen atoms in C≡N with Li + ion [22]. In PMMA, the C=O symmetrical stretch, -O-CH 3 stretching vibrations, -CH 3 symmetrical bending, -CH 2 wagging, C-O-C Brought to you by | University of Connecticut Authenticated Download Date | 6/12/15 1:32 PM The vibrational absorption peak corresponds to asym (SO 2 )-in-plane stretching vibration of SO 2 of imide anion is obtained at 1355 cm −1 [23] and is shifted to 1347 cm −1 in the complex F1.…”