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dc.contributor.authorScott, Jonathan B.en_NZ
dc.contributor.authorHasan, Rahaten_NZ
dc.date.accessioned2019-11-17T21:29:54Z
dc.date.available2019-01-01en_NZ
dc.date.available2019-11-17T21:29:54Z
dc.date.issued2019en_NZ
dc.identifier.citationScott, J. B., & Hasan, R. (2019). New results for battery impedance at very low frequencies. IEEE Access, 7, 106924–106929. https://doi.org/10.1109/ACCESS.2019.2932094en
dc.identifier.issn2169-3536en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/13150
dc.description.abstractIn search of an equivalent circuit model for rechargeable batteries, many authors start with a measurement of battery impedance, spanning what is presumed to be the frequency range of interest. Various networks have been suggested in the literature to account for the measured impedance characteristic. Most incorporate two or more resistors, at least one capacitor, some include at least one Warburg element, and more recently “constant phase elements”(CPE), otherwise identified as fractional-derivative capacitors. Networks that are more successful at reproducing the measured impedance have from five up to tens of degrees of freedom. The frequency range upon which most models are based extends only to 1mHz. This is surprising since many batteries see a daily or longer usage cycle, corresponding to a frequency of ≈ 11.6 μHz or lower. We show in this manuscript that the most-cited impedance measurement instrument, and one of the few that can operate below 1mHz, can be unreliable at and below this boundary. We present a novel impedance measurement algorithm robust against the issues present while measuring the impedance of electrochemical systems to as low as 1 μHz. Next, we present reliable impedance data extending to a lower frequency limit of 10 μHz. A remarkable characteristic appears at the lower frequencies, suggesting a surprisingly simple and elegant equivalent circuit consisting of a single fractional capacitor. A new model is proposed, which requires only four parameters to predict the measured impedance as a function of frequency.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherIEEEen_NZ
dc.rights© 2019 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
dc.subjectScience & Technologyen_NZ
dc.subjectTechnologyen_NZ
dc.subjectComputer Science, Information Systemsen_NZ
dc.subjectEngineering, Electrical & Electronicen_NZ
dc.subjectTelecommunicationsen_NZ
dc.subjectComputer Scienceen_NZ
dc.subjectEngineeringen_NZ
dc.subjectEquivalent circuit modelen_NZ
dc.subjectfrequency domain analysisen_NZ
dc.subjectimpedance measurementen_NZ
dc.subjectrechargeable batteriesen_NZ
dc.subjectEQUIVALENT-CIRCUITen_NZ
dc.subjectSPECTROSCOPYen_NZ
dc.subjectCHARGEen_NZ
dc.subjectSTATEen_NZ
dc.subjectMODELSen_NZ
dc.titleNew results for battery impedance at very low frequenciesen_NZ
dc.typeJournal Article
dc.identifier.doi10.1109/ACCESS.2019.2932094en_NZ
dc.relation.isPartOfIEEE Accessen_NZ
pubs.begin-page106924
pubs.elements-id240628
pubs.end-page106929
pubs.publication-statusPublisheden_NZ
pubs.volume7en_NZ


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