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dc.contributor.authorHelseth, Lars Egil
dc.date.accessioned2022-08-15T08:00:24Z
dc.date.available2022-08-15T08:00:24Z
dc.date.created2022-08-14T17:22:56Z
dc.date.issued2022
dc.identifier.issn2352-152X
dc.identifier.urihttps://hdl.handle.net/11250/3011761
dc.description.abstractSupercapacitors are often charged using constant currents. The capacitance can be determined from the slope of the voltage-time curve if the measured voltage over the supercapacitor increases linearly with time. However, the resulting voltage-time curve is often nonlinear, which may lead one to interpret the capacitance as being either time or voltage dependent. In the current work, systematic experimental studies of the nonlinearity of galvanostatic charging curves as a function of applied current and temperature are undertaken for commercial supercapacitors in the range 1–1000 F. A consistent theory is developed to explain the available data. It is demonstrated that the nonlinearity in the voltage-time curve can be attributed to a constant capacitance in parallel with a resistance, the latter which is inversely proportional to the applied current. The influence of faradaic charge transfer reactions or surface charge reorganization on this parallel resistance is analyzed. The proposed theory is also used to analyze galvanostatic charging data available in the research literature, and the different types of nonlinearities observed provide new insight into the mechanisms occurring during charging of various types of supercapacitors.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleThe nonlinearities in the galvanostatic charging curves of supercapacitors provide insights into charging mechanismsen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.source.articlenumber105440en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1
dc.identifier.doi10.1016/j.est.2022.105440
dc.identifier.cristin2042857
dc.source.journalJournal of Energy Storageen_US
dc.identifier.citationJournal of Energy Storage. 2022, 55 (Part A), 105440 .en_US
dc.source.volume55en_US


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal