Physicochemical characterizations of novel dicyanamide-based ionic liquids applied as electrolytes for
Ramzi Zarrougui1, Rahma Hachicha1,2,3, Refka Rjab1,2
1Laboratoire des Matériaux Utiles (LR10INRAP01), Institut National de Recherche et D'analyse Physico-chimique Biotechpole Sidi Thabet 2020 Ariana Tunisia ramzi.zarrougui@inrap.rnrt.tn +216 71 537 659.
Abstract:
Novel ionic liquids (ILs), containing a dicyanamide anion (DCA-), are synthesized and applied as suitable electrolytes for electrochemical double layer capacitors (EDLCs). The prepared ILs are either composed of triethyl-propargylammonium (N222pr +) or triethyl-butylammonium (N2224 +) cations paired with the DCA- anion. The structure of the cation influences its electrostatic interaction with the DCA- anion and highly impacts the physical and electrochemical properties of the as-prepared ILs. The geometry and the length of the alkyl chain of the propargyl group in N222pr + enhance the ionic conductivity of N222pr-DCA (11.68 mS cm-1) when compared to N2224-DCA (5.26 mS cm-1) at 298 K. It is demonstrated that the Vogel-Tammann-Fulcher model governs the variations of the transport properties investigated over the temperature range of 298-353 K. A maximum potential window of 3.29 V is obtained when N222pr-DCA is used as electrolyte in a graphene based symmetric EDLC system. Cyclic voltammetry and galvanostatic measurements confirm that both electrolytes exhibit an ideal capacitive behavior. The highest specific energy of 55 W h kg-1 is exhibited in the presence of N2224-DCA at a current density of 2.5 A g-1.
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