Conducted by BatStateU
, Started on 2017 -
Completed on 2017
Completed
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The demand in the wearable components such as batteries and capacitors is exponentially increasing. Batteries and other electrochemical devices that support these increase are now so much dependent on oil and fossil fuels. Biopolymers or natural polymers have attracted the attention of researchers over the last decades, mainly due to their abundance, environmental concerns, and as solution to the anticipated depletion of petroleum resources. In this study, new chitosan-based biopolymer electrolyte system was tested for its properties, potential application for energy storage and as substitute for commercial electrolyte film. Chitosan/PVA electrolyte system was prepared via solution cast technique and was enhanced by incorporating NaI as doping material and glycerol as plasticizer. Film thickness was 60 ±20μm which is within standard specifications for electrolyte films. Tensile strength and percent elongations were found to be 1.26-1.52 MPa and 7.75-22.64% respectively. Chemical degradability to 0.01M NaOH was determined in terms of percent weight losses after neutralization and found to be 1.23-10.54%. Three degradation temperatures were observed at 100oC, 200oC and 250oC and was attributed to loss of moisture/solvent, chitosan degradation and PVA degradation respectively. Thermogravimetric (TGA) analysis indicates that the electrolytes were stable until 250oC. The ionic conductivity was determined using Electrochemical Impedance Spectroscopy (EIS) with frequency ranging from 0.1 Hz to 1 MHz. The highest ionic conductivity achieved for Chitosan/PVA-NaI film was 1.684x10-4 S/cm at room temperature. SEM analysis indicates that the highest ionic conductivity complex exhibits more amorphous nature. The highest obtained ionic conductivity was comparable to the commercially available one. This work thus demonstrates that Chitosan/PVA-NaI is a good candidate as substitute for commercial electrolyte film at low temperature applications.