Physicochemical properties of the ionic liquids can be tuned conveniently through alteration of the structure of the constitute ions. Ether-siloxane substituent on imidazole core effect on its ILs has been established for imparting low viscosity and improved thermal properties even for high molecular weight ionic liquids. In this study we investigated of two novel imidazolium ionic liquids bearing ether-ether (1O2O2-Im-2O1) and ether-siloxane (1O2O2-Im-1SiOSi) functionalities with TFSI anion and their mixtures with propylene carbonate as electrolyte in lithium-ion battery. The electrochemical stability and conductivity of these novel ILs were analyzed by electrochemical studies such as cyclic voltammetry, linear sweep voltammetry and impedance measurements. Moreover we have studied the Li transportation by ether bearing imidazolium ILs in propylene carbonate. The application of these ILs as an electrolyte in Li-ion batteries was studied in presence of high concentration of LiTFSI (1 mol/kg electrolyte) and ether-ether IL was shown to possess high electrochemical stability window (ESW) of 5.9 V and good conductivity of 2.2 mS/cm. The electrochemical stability and conductivity was further complimented by self-diffusion of constitute ions using pulsed gradient spin-echo (PGSE) NMR, viscosity and thermal properties like TGA and DSC analysis. More importantly, we explored the effect of temperature on the electrochemical stability and conductivity of these ILs by electrochemical impedance spectroscopy.

Ether and siloxane functional ILs in propylene carbonate for Li-ion batteries

253rd National Meeting (2017)

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