Preparation of Ionic Conductivity Polymer Electrolyte Film Based on Epoxidized Deproteinized Natural Rubber

Ionic conductivity polymer electrolyte film based on epoxidized deproteinized natural rubber (EDPNR) and lithium salt lithium triflate (LiCF3SO3) were prepared by solution casting technique. The EDPNR was prepared from deproteinized natural rubber latex (DNR) epoxidized in the latex stage with fresh peracetic acid 33%, which was deproteinized by incubation of the latex with 0,1 wt% urea and 1 wt% surfactant. The ionic conductivity of EDPNR mixed with lithium salt was investigated through impedance analysis. The results show that the conductivity of EDPNR/ LiCF3SO3 mixture was dependent on LiCF3SO3 salt concentration and amount of epoxy group. The highest ionic conductivity at room temperature obtained is 1,71 x 10-5 S.cm-1 at 35 wt% LiCF3SO3 and 45 mol% epoxy groups. Fourier transform infrared spectroscopy (FTIR) spectra showed evidence of complexation between EDPNR and LiCF3SO3. Glass transition temperature, Tg displayed an increasing trend in which are the increase in salt concentration and the increase in epoxy group concentration.

Structural, vibrational, electrical, electrochemical and capacitive investigations on ioinc liquid doped P (VDF-HFP) + NaSCN based polymer electrolytes

: Solid polymer electrolyte (SPEs) films based on poly (vinylidene fluoride-co-hexafluoropropylene) P(VDF– HFP) and sodium thiocyanate (NaSCN) are prepared using the solution casting technique. Ionic liquid (IL; 1−ethyl-3- methyl−imidazolium tricyanomethanide ([EMIM][TCM]) is incorporated into the prepared polymer-salt complex matrix to further enhance its ionic conductivity. Polarized optical microscopy (POM) shows a change in the surface morphology of IL doped polymer electrolyte films. The composite nature of polymer electrolyte films is confirmed using Fourier transform infrared (FT−IR) spectroscopy via studying ion-ion and ion-polymer interactions. The structural morphology of ionic liquid doped polymer electrolyte films (ILDPE) confirms the complexation between the ionic liquid ([EMIM][TCM]), salt (NaSCN) and polymer P(VDF–HFP). This is further confirmed using DSC and XRD measurements. The XRD structural analysis confirms the intensity of crystalline peaks presents in IL doped solid polymer electrolyte films decreases compared to that of pure polymer as well as polymer salt complex system. XRD clearly indicates the enhancement in its amorphous nature which is necessary to increase the conductivity. The incorporation of IL into polymer salt–complex matrix leads to changes in melting of polymer electrolytes, confirmed by DSC thermograms. Polymer electrolyte films are also characterized using impedance spectroscopy (IS) to check their electrical properties. The highest ionic conductivity is found to be 7.80×10-4 S cm-1 for 6 wt% IL doped polymer electrolyte film. The Linear sweep voltammetry (LSV) analysis shows that the optimized polymer gel electrolyte is electrochemically stable up to 1.5 V. The calculated value of ionic transference number (tion) is found to be 0.985. A laboratory scale electrical double layer capacitor (EDLC) has been fabricated using this highly conducting polymer electrolyte film. The specific capacitance value is found to be 1.31 F g-1.

Ionic Conductivity of Chitosan-based Polymer Electrolyte with Polyethylene Glycol (PEG) as Plasticizer and KCl as Alkaline Ion Transport Source

Polymer electrolyte films were fabricated utilizing chitosan biopolymer plasticized with polyethylene glycol (PEG) and KCl addition as ionic transport source. The precursor solution was prepared by mixing the chitosan in acetic acid solution and PEG that act as a plasticizer. Into the mixed solution was added KCl salt for as alkalin ion transport source in the polymer electrolyte. The polymer electrolyte films were fabricated by the casting method onto the petri glass. The influence of KCl content on ionic conductivity of the composite polymer electrolyte film was studied. The ionic conductivity of the composite polymer electrolyte film was characterized using LCR meter at a frequency of 1 kHz. The best ionic conductivity was found for the film containing 45 wt% of KCl salt. The activation energy was determined by using Arrhenius plot based on conductivity data at varied temperature. It has been found that the activation energy of the composite polymer electrolyte films varied to the KCL content in the composite polymer electrolyte films. The highest activation energy was found for the polymer electrolyte film with 45 wt% of KCl content.