Complex capacitance analysis of porous carbon electrodes for electric double-layer capacitors

A new analytical methodology, complex capacitance analysis, is developed for porous carbons that are employed as electric double-layer capacitor (EDLC) electrodes. Based on the transmission line model, the imaginary capacitance profiles (Cim vs. log f) are theoretically derived for a cylindrical por...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Electrochemical Society 2004, Vol.151 (4), p.571-577
Main Authors: JANG, Jong H, OH, Seung M
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors. Resistors. Filters
Electrical engineering. Electrical power engineering
Exact sciences and technology
Various equipment and components
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A new analytical methodology, complex capacitance analysis, is developed for porous carbons that are employed as electric double-layer capacitor (EDLC) electrodes. Based on the transmission line model, the imaginary capacitance profiles (Cim vs. log f) are theoretically derived for a cylindrical pore and further extended to multiple pore systems. The theoretical derivation illustrates that two important electrochemical parameters in EDLCs can be estimated from the peak-shaped imaginary capacitance plots: total capacitance from the peak area and rate capability from the peak position. The usefulness of this analysis in estimating EDLC parameters is demonstrated by applying to two sets of practical porous carbon electrodes. In addition, the penetrability distribution curves that are derived from the experimental imaginary capacitance data using the log-normal assumption and discrete Fourier transform allow us to estimate the pore structure of carbon electrodes.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1647572