Polyacrylonitrile Based Gel Polymer Electrolyte for Rechargeable Magnesium Ion Batteries
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Date
2020
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Journal ISSN
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Publisher
Uva Wellassa University of Sri Lanka
Abstract
The demand for energy storage devices has highly increased with the increment of the
demand for electronic portable devices and electric vehicles. Therefore, developing
rechargeable batteries has received the most attention. Among the components of a
rechargeable battery, electrolyte is highly concerned as it is the medium for the transfer of
charges between the pair of electrodes. Developing gel polymer electrolytes is mostly
explored due to its favourable performances and minimum drawbacks compared to liquid
electrolytes and solid electrolytes. In this research polyacrylonitrile based gel polymer
electrolyte for magnesium ion batteries was prepared and characterized to investigate its
physicochemical properties. Preparation of gel polymer electrolytes was carried out by a
common solution casting technique using dimethyl sulfoxide as the solvent, magnesium
trifluoromethanesulphonate as the salt and 1-butyl-1-methylpyrrolidinium
bis(trifluoromethylsulfonyl)imide as the ionic liquid. Impedance spectroscopy, Fourier
transform infrared spectroscopy, X-ray diffraction, and Differential scanning calorimetry
was performed to analyse the prepared electrolyte samples. The maximum room
temperature ionic conductivity of 2.33×10-3 S cm-1
and 3.33×10-3 S cm-1 were obtained
for the sample before and after the addition of ionic liquid respectively. Considerable
indications for the polymer-solvent, polymer-salt, and polymer-salt-ionic liquid
interactions were investigated by analysing Fourier transform infrared spectroscopy.
Although the crystallinity has increased with the addition of salt due to the formation of
ion pairs and aggregates, the effect has been preserved with the addition of ionic liquid.
The glass transition temperature has also increased from 80 0C to 104 0C after the
coordination of polyacrylonitrile with magnesium trifluoromethanesulphonate, however,
it is reduced to 102 0C after the addition of ionic liquid.
Keywords: Gel polymer electrolyte, Polyacrylonitrile, Magnesium
trifluoromethanesulphonate, Ionic liquid, Ionic conductivity
Description
Keywords
Materials Sciences, Mineral Sciences, Energy saving