Ion-Liquid Based Supercapacitors with Inner Gate Diode-Like Separators

In order to minimize unintentional discharge, supercapacitors are interfaced with a membrane that separates the anode from the cathode—this membrane is called the separator. We focus here on separators, which are structured as electronic diode-like. We call an electrically structured separator “the...

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Bibliographic Details
Published in:ChemEngineering 2019-06, Vol.3 (2), p.39
Main Authors: Chowdhury, Tazima S., Grebel, Haim
Format: Article
Language:English
Subjects:
Capacitance
Carbon
Chemical engineering
diode-like separators
Electrodes
Electrolytes
Energy dissipation
energy storage elements
gated supercapacitors
Interfaces
Internal energy
Ionic liquids
Membranes
Separators
Supercapacitors
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Summary:In order to minimize unintentional discharge, supercapacitors are interfaced with a membrane that separates the anode from the cathode—this membrane is called the separator. We focus here on separators, which are structured as electronic diode-like. We call an electrically structured separator “the gate”. Through experiments, it was demonstrated that ionic liquid-filled supercapacitors, which were interfaced with gated separators exhibited a substantial capacitance (C) increase and reduction in the equivalent series resistance (ESR) compared to cells with ordinary separators. These two attributes help to increase the energy, which is stored in a cell, since for a given cell’s voltage, the dissipated energy on the cell, UR = V2/4(ESR) and the stored energy, UC = CV2/2, would increase. These were indeed ionic diodes since the order of the diode layout mattered—the diode-like structures exhibited maximum capacitance when their p-side faced the auxiliary electrode.
ISSN:2305-7084
2305-7084
DOI:10.3390/chemengineering3020039