Lithium salt assisted enhanced performance of supercapacitor based on quasi solid-state electrolyte

The role of lithium salt [LiTFSI] in ionic liquid [EMIMTFSI] based quasi solid-state electrolyte (QS-SE) on the performance of supercapacitor has been investigated. TGA results show that the synthesized QS-SE has good thermal stability (similar to 340 degrees C; onset temperature). The ionic conductivity of QS-SE increases with increasing the temperature and attains a value of similar to 1.93 x 10(-3)S. cm(-1) at 30 degrees C and 4.91 x 10(-3) S.cm(-1) at 70 degrees C. The supercapacitor is fabricated using two carbon electrodes and can operate up to 3 V. The prepared supercapacitor has improved specific capacitance of 90 F.g(-1) at 1 mA.cm(-2) discharging rate (specific current 0.625 A.g(-1)). The cyclic tests indicate the stable performance of the supercapacitor cell with only 17% of initial fading in specific capacitance and high Coulombic efficiency (between 98 and 99%) after more than 2000 charge-discharge cycles. (C) 2018 King Saud University. Production and hosting by Elsevier B.V.