Ion-liquid based supercapacitors with inner gate diode-like separators

Tazima S. Chowdhury, Haim Grebel

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number39
Pages (from-to)1-9
Number of pages9
JournalChemEngineering
Volume3
Issue number2
DOIs
StatePublished - Jun 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Engineering(all)
  • Energy(all)

Keywords

  • Diode-like separators
  • Energy storage elements
  • Gated supercapacitors
  • Supercapacitors

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