Leakage currents and self-discharge of ionic liquid-based supercapacitors

Ionic liquid (IL)-based supercapacitors have been widely demonstrated to outperform electrochemical double-layer capacitors (EDLCs) working with conventional organic electrolytes in terms of specific energy and operating voltage. Here, the results of a study on the leakage currents ( I leak ) and se...

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Published in:Journal of applied electrochemistry 2014-04, Vol.44 (4), p.491-496
Main Authors: Soavi, Francesca, Arbizzani, Catia, Mastragostino, Marina
Format: Article
Language:English
Subjects:
Capacitors
Chemistry
Chemistry and Materials Science
Electric potential
Electrochemistry
Electrolytes
Electrolytic cells
Industrial Chemistry/Chemical Engineering
Leakage current
Leaks
Physical Chemistry
Research Article
Supercapacitors
Voltage
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container_title Journal of applied electrochemistry
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creator Soavi, Francesca
Arbizzani, Catia
Mastragostino, Marina
description Ionic liquid (IL)-based supercapacitors have been widely demonstrated to outperform electrochemical double-layer capacitors (EDLCs) working with conventional organic electrolytes in terms of specific energy and operating voltage. Here, the results of a study on the leakage currents ( I leak ) and self-discharge energy loss factors (SDLF) of IL-based EDLCs at different cell voltages up to 3.2 V and at 30° and 60 °C are reported. Cells assembled with the N -butyl- N -methyl-pyrrolidinium bis(trifluoromethanesulfonyl) imide (PYR 14 TFSI) and N -methoxyethyl- N -methylpyrrolidinium bis(trifluoromethanesulfonyl)imide pure ILs and a mixture of PYR 14 TFSI and propylene carbonate (PC) 1 to 1 molar were tested. The results are compared to those achieved with EDLCs featuring the conventional 1 M tetraethyl ammonium tetrafluoroborate (Et 4 NBF 4 )-PC electrolyte. The study demonstrates that ILs provide I leak and SDLF that are lower than those obtained with the latter electrolyte, with PYR 14 TFSI allowing the lowest values.
doi_str_mv 10.1007/s10800-013-0647-x
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subjects Capacitors
Chemistry
Chemistry and Materials Science
Electric potential
Electrochemistry
Electrolytes
Electrolytic cells
Industrial Chemistry/Chemical Engineering
Leakage current
Leaks
Physical Chemistry
Research Article
Supercapacitors
Voltage
title Leakage currents and self-discharge of ionic liquid-based supercapacitors
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