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Concept Paper

How to Measure and Calculate Equivalent Series Resistance of Electric Double-Layer Capacitors

1
Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs, School of Electrical and Computer Engineering, University of Campinas, Av Albert Einstein 400, Campinas, SP 13083-852, Brazil
2
Department of Chemistry, Federal University of Jequitinhonha e Mucuri’s Valley, Highway MGT 367, km 583, 5000, Alto da Jacuba, Diamantina, MG 39100-000, Brazil
*
Authors to whom correspondence should be addressed.
Molecules 2019, 24(8), 1452; https://doi.org/10.3390/molecules24081452
Received: 21 February 2019 / Revised: 24 March 2019 / Accepted: 28 March 2019 / Published: 12 April 2019
(This article belongs to the Special Issue Advances in Electrochemical Energy Storage Devices)
Electric double-layer capacitors (EDLCs) are energy storage devices that have attracted attention from the scientific community due to their high specific power storage capabilities. The standard method for determining the maximum power (Pmax) of these devices uses the relation Pmax = U2/4RESR, where U stands for the cell voltage and RESR for the equivalent series resistance. Despite the relevance of RESR, one can observe a lack of consensus in the literature regarding the determination of this parameter from the galvanostatic charge-discharge findings. In addition, a literature survey revealed that roughly half of the scientific papers have calculated the RESR values using the electrochemical impedance spectroscopy (EIS) technique, while the other half used the galvanostatic charge discharge (GCD) method. RESR values extracted from EIS at high frequencies (>10 kHz) do not depend on the particular equivalent circuit model. However, the conventional GCD method better resembles the real situation of the device operation, and thus its use is of paramount importance for practical purposes. In the latter case, the voltage drop (ΔU) verified at the charge-discharge transition for a given applied current (I) is used in conjunction with Ohm’s law to obtain the RESR (e.g., RESR = ΔUI). However, several papers have caused a great confusion in the literature considering only applied current (I). In order to shed light on this important subject, we report in this work a rational analysis regarding the GCD method in order to prove that to obtain reliable RESR values the voltage drop must be normalized by a factor of two (e.g., RESR = ΔU/2I). View Full-Text
Keywords: equivalent series resistance; galvanostatic charge-discharge method; impedance technique; voltage drop; simulation of equivalent circuit models equivalent series resistance; galvanostatic charge-discharge method; impedance technique; voltage drop; simulation of equivalent circuit models
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MDPI and ACS Style

Vicentini, R.; Da Silva, L.M.; Cecilio Junior, E.P.; Alves, T.A.; Nunes, W.G.; Zanin, H. How to Measure and Calculate Equivalent Series Resistance of Electric Double-Layer Capacitors. Molecules 2019, 24, 1452. https://doi.org/10.3390/molecules24081452

AMA Style

Vicentini R, Da Silva LM, Cecilio Junior EP, Alves TA, Nunes WG, Zanin H. How to Measure and Calculate Equivalent Series Resistance of Electric Double-Layer Capacitors. Molecules. 2019; 24(8):1452. https://doi.org/10.3390/molecules24081452

Chicago/Turabian Style

Vicentini, Rafael, Leonardo Morais Da Silva, Edson Pedro Cecilio Junior, Thayane Almeida Alves, Willian Gonçalves Nunes, and Hudson Zanin. 2019. "How to Measure and Calculate Equivalent Series Resistance of Electric Double-Layer Capacitors" Molecules 24, no. 8: 1452. https://doi.org/10.3390/molecules24081452

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