Crystallinity Of Polymer Electrolytes Research Articles

Investigation of ionic liquid-based poly(vinyl alcohol) proton conductor for electrochemical double-layer capacitor

Ionic liquid-based poly(vinyl alcohol) (PVA) proton-conducting polymer electrolytes are prepared using solution casting technique. The effect of adding 1-butyl-3-methylimidazolium iodide (BmImI) ionic liquid into PVA-ammonium acetate polymer system is investigated in this work. Ionic conductivity of polymer electrolytes is increased by two orders of magnitude upon inclusion of 70 wt% of BmImI. Addition of ionic liquid reduces the glass transition temperature and crystallinity of polymer electrolytes. Electrical double-layer capacitors (EDLCs) are assembled using dip-coating technique. The electrochemical properties of fabricated EDLCs are analysed using cyclic voltammetry.

Multiwall carbon-nanotube-doped ion conducting polymer electrolyte for electrochemical application

Electrical, structural and optical properties of a composite containing a polymer electrolyte (namely polyethylene oxide complexed with sodium iodide) and multiwall carbon nanotube (MWCNT) are reported. The films of these composites were ‘solution casted’ using the viscous solution of polyethylene oxide (PEO) complexed with sodium iodide (NaI) in desired ratios and characterised using various techniques. The conductivity versus composition plot in PEO:NaI shows conductivity maxima at 12 wt% NaI concentration while in MWCNTs doped polymer electrolyte it occurs at 40 wt% MWCNTs concentration. The surface morphology by scanning electron microscopy (SEM) shows the enhancement in amorphous reason by MWCNTs doping which is a well-known favourable condition for conductivity enhancement. The differential scanning calorimetry shows that dispersal of MWCNTs reduces the crystallinity of polymer electrolyte that is well-supported by our polarised optical micrographs and SEM measurements.