H. Hamzah

Preparation and characterization of PMMA?MG49?LiClO4 solid polymeric electrolyte

The potential of hybrid polymer 49% poly(methyl methacrylate)-grafted natural rubber (MG49) and poly(methyl methacrylate) (PMMA) as a polymer host in solid polymer electrolyte film for rechargeable battery systems has been investigated. The hybrid films were prepared by the solution casting technique. The ionic conductivity was investigated by alternating current electrochemical impedance spectroscopy. The highest conductivity was 1.47 ? 10?8?S?cm?1 at 20?wt% of LiClO4. The observation on structural studies performed by x-ray diffraction showed that the crystallinity phase is reduced at the highest conductivity. Fourier transform infrared spectroscopy analysis showed that the interaction between lithium ion and oxygen atoms occurred at carbonyl (C=O) and ether (C?O?C) groups.

Comparative study of the properties of plasticized (PVDF-HFP)-MG49-LiBF 4 blend polymer electrolytes

Poly(vinylidene fluoride-hexafluoro propylene) (PVDF-HFP) blended with poly (methyl methacrylate) grafted natural rubber (MG49) and lithium tetrafluoroborate (LiBF4) as charge carriers based polymer electrolyte was prepared by solution casting technique. The effect of propylene carbonate (PC) and ethylene carbonate (EC) plasticizers on the properties of the polymer electrolyte films was investigated. Electrochemical impedance spectroscopy (EIS) showed that ionic conductivity increases as the concentration of plasticizer increases and the highest room temperature conductivities obtained are 1.51 × 10−3 S cm−1 and 7.39 × 10−4 S cm−1 at 80 wt % PC and 40 wt % EC, respectively. The addition of PC resulted in ionic conductivity enhancement in contrast with EC plasticizer. The temperature dependence conductivity for 80 wt % PC reached 6.52 × 10−2 S cm−1 at 373 K. Scanning electron microscopy (SEM) indicated the compatibility of PC with (PVDF-HFP)-MG49-LiBF4 whereas EC shows immiscibility with (PVDF-HFP)-MG49-LiBF4 complex. X-Ray Diffraction (XRD) studies show high degree of amorphous nature of the plasticized polymer electrolytes as indicated by reduction in the intensity of crystalline peaks. Thermogravimetric analysis (TGA) illustrates that the addition of plasticizer decreases the thermal stability of polymer electrolyte. However, linear sweep voltammetry (LSV) shows the electrochemical stability is up to 4 V.

Ionic Conductivity of PVDF-HFP/MG49 Based Solid Polymer Electrolyte

Blend-based polymer electrolytes composed of PVDF-HFP/MG-49 (70/30) and LiClO4 as lithium salt has been studied. Solution casting method was applied to prepare the polymer electrolyte. Electrochemical impedance spectroscopy (EIS) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the electrolyte films. The maximum value of 2.51×10ˉ6 S cm-1 was obtained at ambient temperature for the 30 wt. % of LiClO4 and the conductivity increased to 1.10×10ˉ3 S cm-1 by increasing the temperature up to 383 K. FTIR spectra demonstrated that complexation occurred between the polymers and lithium salt.