Morphology, chemical interaction, and conductivity of a PEO-ENR50 based on solid polymer electrolyte

Abstract

A solid polymer electrolytes (SPE) comprising blend of poly(ethylene oxide; PEO) and epoxidized natural rubber as a polymer host and LiCF 3 SO 3 as a dopant were prepared by solution-casting technique. The SPE films were characterized by field emission scanning electron microscopy to determine the surface morphology, X-ray diffraction, and differential scanning calorimeter to determine the crystallinity and thermogravimetric analysis to confirm the mass decrease caused by loss of the solvent. While the presence of the complexes was investigated by reflection Fourier transform infrared (ATR-FTIR) spectroscopy. Electrochemical impedance spectroscopy was conducted to obtain ionic conductivity. Scanning electron microscopy analysis showed that a rough surface morphology of SPE became smoother with addition of salt, while ATR-FTIR spectroscopy analysis confirmed the polymer salt complex formation. The interaction occurred between the salt, and ether group of polymer host where the triple peaks of ether group in PEO merged and formed one strong peak at 1,096 cm −1 . Ionic conductivity was found to increase with the increase of salt concentration in the polymer blend complexes. The highest conductivity achieved was 1.4× 10 −4 Scm −1 at 20 wt.% of LiCF 3 SO 3 , and this composition exhibited an Arrhenius-like behavior with the activation energy of 0.42 eV and the preexponential factor of 1.6×10 3 Scm −1 .

Study of MG49-PMMA Based Solid Polymer Electrolyte

“…The LiBF 4 peaks are not seen in any of the polymer-salt complexes and this signifies that LiBF 4 salt solvates very well in MG49-PMMA matrix, resulting in absence of pure salt phase in the complexes [14]. Fig.…”

“…It was observed that the vibration mode of v(C-O-C), and (O-CH 3 ) at 984 cm -1 and 1457 cm -1 for pure MG49 were shifted to 992 cm -1 and 1450 cm -1 after blending with PMMA. This shifting was due to existence of intermolecular interaction between oxygen atoms with methylene group in the MMA moiety [14]. With the addition of LiBF 4 salt, the intensity of v(C-O-C), v as (C-O-C) and (O-CH 3 ) of MMA peak was reduced and shifted to lower wavenumbers.…”

“…The disc shaped sample of 16 mm in diameter was sandwiched between two stainless steel block electrodes. The ionic conductivity ( ) was calculated from the R b , the bulk resistance (R b ) was obtained from the intercept on real impedance axis (Z' axis), the film thickness ] ratio for the polymer blend was calculated by equation [14]: …”

Synergetic effect of TiO2 nano filler additives on conductivity and dielectric properties of PEO/PVP nanocomposite electrolytes for electrochemical cell applications

“…The formation of micro-voids over the surface of films is due to rapid evaporation of the solvent during the preparation of polymer blends. Apparently, surface smoothness It evidences for further increase of amorphous portion in the matrix of salt complexed nano composites, which favours for the enhancement of ionic conductivity [38][39][40]. From the TEM image ( figure 2(c)) the average size of nano fillers is found to be 10 nm and dispersed nano particles are observed to be uniformly distributed in the matrix of salt complexed blend electrolytes.…”

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

“…The coordination interactions of the ether oxygen atoms of MAA:EA with VO 2+ cations, which result in a reduction in crystallinity of MAA:EA copolymer, are responsible for the increase in ionic conductivity. The maximum conductivity shows the maximum and effective interaction between oxygen atoms and VO 2+ cations in the electrolytes 19 . VO 2+ ions dissociation is an additional factor in enhancement of ionic conductivity.…”