Abstract
A gel electrolyte of sodium bis(trifluoromethanesulfonyl)imide (NaTFSI)-polyethylene oxide (PEO) in an organic solvent mixture has been prepared and examined for supercapacitor applications by using activated carbon electrodes. The solvent was a mixture of propylene carbonate, dimethyl carbonate, and ethylene carbonate at equal molar ratio, and also, a propylene carbonate-based gel was used for a comparison. The polymer-salt interaction was viewed by infrared spectral study. The cells have been characterized in a two-electrode type using linear sweep voltammetry, cyclic voltammetry, galvanostatic cycling, and impedance techniques at 22 °C. The voltammograms evidence symmetry and reversibility of the cells. The ternary gel has shown better electrochemical performances. Moreover, the cell operative potential window was found to be stable at 2.5 V with high specific capacitance and also a good efficiency at low charge rate. The typical obtained specific capacitance, real power, and energy density values are 24 F g−1, 0.52 kW kg−1, and 18.7 Wh kg−1, respectively, which may be viewable for a compact capacitor.
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Acknowledgments
The authors would like to thank all of our group researchers Raúl Díaz Delgado, Rebeca Marcilla Enrique García, Susana Vaquero Morata, Suheda Isikli, Laura Sanz Rubio, and Teresa González de Chávez Capilla for their timely help, and RC thanks Marie Curie Amarout award and its financial support of this work.
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Ramasamy, C., Palma del vel, J. & Anderson, M. An activated carbon supercapacitor analysis by using a gel electrolyte of sodium salt-polyethylene oxide in an organic mixture solvent. J Solid State Electrochem 18, 2217–2223 (2014). https://doi.org/10.1007/s10008-014-2466-3
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DOI: https://doi.org/10.1007/s10008-014-2466-3