Treatments of Impedance Behavior of Various Circuits and Modeling of Double-Layer Capacitor Frequency Response

  • B. E. Conway

Abstract

In earlier chapters it has been emphasized that the high-area, porous carbon structures that provide large specific (per gram) capacitance values (in practice, 5 to 50 F g-1) cannot be represented by a simple capacitance or even by a simple RC circuit. The diagrams in Fig. 17.1 represent a hierarchy of equivalent circuits, from those for a simple capacitor through those involving simple combinations of a capacitor element with either one or two ohmic or equivalent ohmic resistors, to more complex equivalent circuits involving distributed capacitance with ohmic elements in series or parallel coupling with the capacitative elements and, for some conditions, with Faradaic leakage resistances in parallel with the capacitative elements. The latter may also include contributions from pseudocapacitances associated with surface redox functionalities (Chapter 9) on the interfaces or edges of carbon particles or the main pseudocapacitance associated with redox oxide capacitor materials (Chapter 11). In some cases, considered later, the equivalent circuit may also include an inductive element, L.

Keywords

Equivalent Circuit Porous Electrode Electrochemical Capacitor Impedance Behavior Equivalent Series Resistance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1999

Authors and Affiliations

  • B. E. Conway
    • 1
  1. 1.Fellow of the Royal Society of CanadaUniversity of OttawaOttawaCanada

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