K.B. Md Isa

Conductivity Studies of Plasticized‐poly(methylmethacrylate) (PMMA) Polymer Electrolytes Films

In the present study, five systems of samples have been prepared by the solution casting technique. Polymethylmethacrylate (PMMA) is used as a based polymer. Ethylene carbonate (EC) and propylene carbonate (PC) as plasticizers. The salt that was selected for this study is lithium triflate (LiCF3SO3). The pure PMMA sample is taken as a reference. The five systems are the (PMMA–EC) system, the (PMMA–PC) system, the (PMMA‐LiCF3SO3) system, the ([PMMA‐EC]‐LiCF3SO3) system and the ([PMMA–PC]‐LiCF3SO3) system. The conductivity for each system is characterized using impedance spectroscopy. The conductivity of the pure PMMA, the (PMMA–EC) system and the (PMMA–PC) system at room temperature is 2.37×10−9 Scm−1, 3.63×10−8 Scm−1 and 4.18×10−8 Scm−1 respectively. On addition of salt in the (PMMA–LiCF3SO3) system, the conductivity is increased by two orders of magnitude. The conductivity for the ([PMMA–EC]‐LiCF3SO3) system and the ([PMMA–PC]‐LiCF3SO3) system is 3.54×10−5 Scm−1 and 2.06×10−5 Scm−1 respectively. The cond...

Electrical and electrochemical studies on sodium ion-based gel polymer electrolytes

Gel polymer electrolytes (GPEs) have captured great attention because of their unique properties such as good mechanical stability, high flexibility and high conductivity approachable to that of the liquid electrolytes. In this work, we have prepared sodium ion conducting gel polymer electrolyte (GPE) films consisting of polyvinylidenefluoride-co-hexafluoropropylene (PVdF-HFP) as a polymer host using the solution casting technique. Sodium trifluoromethane- sulfonate (NaCF3SO3) was used as an ionic salt and the mixture of ethylene carbonate (EC) and propylene carbonate (PC) as a plasticizing solvent. Impedance spectroscopy measurements were carried out to determine the ionic conductivity of the GPE films. The sample containing 20 wt.% of NaCF3SO3 salt exhibits the highest room temperature ionic conductivity of 2.50 × 10−3 S cm-1. The conductivity of the GPE films was found to depend on the salt concentration that added to the films. The ionic and cationic transference numbers of GPE films were estimated by...

Transport and Morphological Properties of Gel Polymer Electrolytes Containing Mg(CF3SO3)2

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.

Effect of Temperature and Pressure on Ionic Conductivity of PAN‐Based Polymer Electrolytes Containing Inorganic Salts

The conducting polymer electrolyte films consisting polyacrylonitrile (PAN) as the host polymer, ethylene carbonate (EC) as a plasticizer, lithium triflate (LiCF3SO3) and sodium triflate (NaCF3SO3) 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+24 wt.%EC film, PAN+26 wt.%LiCF3SO3 film, the PAN+24 wt.%NaCF3SO3 film is 3.43×10−11 S cm−1, 3.04×10−4 S cm−1, and 7.13×10−4 S cm−1, respectively. On addition of plasticizer, the room temperature of PAN+LiCF3SO3 and PAN+NaCF3SO3 films increases by one order of magnitude. The conductivity‐temperature and conductivity‐pressure dependence studies are then performed on the highest conducting film from the unplasticized and plasticized systems in the temperature and pressure range between 303 K and 373 K and 0.01 MPa and 0.09 MPa, respectively. The conductivity‐temperature studi...

Ionic Conductivity and Dielectric Properties of the PAN‐Ion Conducting Polymers

In this work, the ion conducting films of polyacrylonitrile (PAN) containing plasticizer and dopant salts were prepared by the solution casting technique. The salts selected for this study are lithium triflate (LiCF3SO3) and sodium triflate (NaCF3SO3). The ionic conductivity measurements were carried out using impedance spectroscopy. The room temperature conductivity for pure polyacrylonitrile film is 1.51×10−11 S cm−1. The room temperature conductivity for the highest conducting film in the PAN‐LiCF3SO3 system and the PAN‐NaCF3SO3 system is 3.04×10−4 and 7.13×10−4 S cm−1, respectively. The conductivity‐temperature studies were performed in the temperature range between 303 K and 373 K. The variation of the conductivity with temperature is obeys the Arrhenius rule. The increase and decrease in the number of ions can be implied from the plots of dielectric constant, er‐frequency and dielectric loss, ei‐frequency.