Publication:
Study of the Impact of Graphite Orientation and Ion Transport on EDLC Performance

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Authors
Gallet de St Aurin, Joseph M.
Phillips, Jonathan
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Date of Issue
2019-04
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MDPI
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Abstract
A model study of electric double layer capacitor (EDLC)-style capacitors in which the electrodes were composed of low surface area-oriented flakes of graphite that compressed to form a paper-like morphology has suggested that ion transport rates significantly impact EDLC energy and power density. Twelve capacitors were constructed, each using the same model electrode material and the same aqueous NaCl electrolyte, but differing in relative electrode orientation, degree of electrode compression, and presence/absence of an ionic transport salt bridge. All were tested with a galvanostat over a range of discharge currents. Significant differences in energy and power density and estimated series resistance were found as a function of all the factors listed, indicating that capacitor performance is not simply a function of the electrode surface area. This simple postulation was advanced and tested against data: net ion (Na+, Cl?) ‘velocity’ during both charge and discharge significantly impacts capacitive performance.
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Article
Description
The article of record as published may be found at http://dx.doi.org/10.3390/ ma15010155
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Naval Postgraduate School (U.S.)
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Format
15 p.
Citation
de St Aurin, Joseph M. Gallet, and Jonathan Phillips. "Study of the Impact of Graphite Orientation and Ion Transport on EDLC Performance." Materials 15.1 (2021): 155.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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