Ionic Conductivity, Morphology and Transference Number of Sodium Ion in PMMA Based Gel Polymer Electrolytes

Abstract:

The gel polymer electrolytes (GPEs) composed of polymethylmethacrylate (PMMA) with sodium trifluoromethanesulfonate (NaCF₃SO₃) salt dissolved in a binary mixture of ethylene carbonate (EC) and propylene carbonate (PC) organic solvents have been prepared by solution casting technique. The samples are prepared by varying the salt concentrations from 5 wt.% to 30 wt.%. Impedance spectroscopy measurement has been carried out to determine the ionic conductivity of the GPE samples. The sample containing 20 wt.% of NaCF₃SO₃ salt exhibits the highest room temperature ionic conductivity of 3.10 x 10^-3 S cm^-1. The conductivity of the GPEs has been found to depend on the salt concentration added to the sample though at higher salt concentration reveals decreasing in ionic conductivity due to ions association. The temperature dependence of conductivity from 303 K to 373 K is found to obey the Arrhenius rule. The ionic transference number, ti of GPEs has been estimated by DC polarization method and the value is found to be 0.95, 0.99, and 0.97 for the sample containing 5 wt.%, 20 wt.% and 30 wt.% respectively. This result is consistent with the conductivity studies.

• Periodical: Key Engineering Materials (Volumes 594-595)
• Pages: 696-701
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.594-595.696
• Online since: December 2013
• Authors: Lisani Othman, Khairul Bahiyah Md. Isa, Woon Gie Chong, Nurul Husna Zainol, Siti Mariam Samin, Zurina Osman, Rosiyah Yahya
• Keywords: Conductivity, GPEs, NaCF₃SO₃, PMMA, Transference Number

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