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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 334-335Ionic Conductivity, Morphology and Transport...

Ionic Conductivity, Morphology and Transport Number of Lithium Ions in PMMA Based Gel Polymer Electrolytes

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Abstract:

The gel polymer electrolytes (GPEs) composed of polymethylmethacrylate (PMMA) with lithium trifluoromethanesulfonate (LiCF₃SO₃) salt dissolved in a binary mixture of ethylene carbonate (EC) and propylene carbonate (PC) organic solvents have been prepared by the 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 samples. The sample containing 25 wt.% of LiCF₃SO₃ salt exhibits the highest room temperature ionic conductivity of 2.56 x 10^-3 S cm^-1. The conductivity of the GPEs has been found to depend on the salt concentration added to the sample, while at higher salt concentration reveals a decrease in the ionic conductivity due to ions association. The temperature dependence of conductivity from 303 K to 373 K is found to obey the Arrhenius law. The ionic transference number, t_iof GPEs has been estimated by the DC polarization method and the value is found to be 0.98, 0.93, and 0.97 for the sample containing 25 wt.%, 5 wt.% and 30 wt.% respectively. This result is consistent with the conductivity studies.

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Diffusion in Solids and Liquids VIII

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Periodical:

Defect and Diffusion Forum (Volumes 334-335)

Pages:

137-142

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.334-335.137

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Cite this paper

Online since:

February 2013

Authors:

Lisani Othman, Khairul Bahiyah Md. Isa, Zurina Osman, Rosiyah Yahya

Keywords:

Conductivity, GPEs, LiCF₃SO₃, PMMA, Transference Number

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