dc.contributor.author | Helseth, Lars Egil | |
dc.date.accessioned | 2020-08-10T12:52:00Z | |
dc.date.available | 2020-08-10T12:52:00Z | |
dc.date.issued | 2019 | |
dc.Published | Helseth LE. Modelling supercapacitors using a dynamic equivalent circuit with a distribution of relaxation times. Journal of Energy Storage. 2019;25:100912 | eng |
dc.identifier.issn | 2352-152X | en_US |
dc.identifier.uri | https://hdl.handle.net/1956/23619 | |
dc.description.abstract | Supercapacitors are often modelled using electrical equivalent circuits with a limited number of branches. However, the limited number of branches often cannot explain long-term dynamics, and one therefore has to resort to more computationally challenging basic models governing diffusion and drift of ions. Here, it is shown that consistent modelling of a supercapacitor can be done in a straightforward manner by introducing a dynamic equivalent circuit model that naturally allows a large number or a continuous distribution of time constants, both in time and frequency domains. Such a model can be used to explain the most common features of a supercapacitor in a consistent manner. In the time domain, it is shown that the time-dependent charging rate and the self-discharge of a supercapacitor can both be interpreted in this model with either a few or a continuous distribution of relaxation times. In the frequency domain, the impedance spectrum allows one to extract a distribution of relaxation times. The unified model presented here may help visualizing how the distribution of relaxation times or frequencies govern the behaviour of a supercapacitor under varying circumstances. | en_US |
dc.language.iso | eng | eng |
dc.publisher | Elsevier | en_US |
dc.rights | Attribution CC BY | eng |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0 | eng |
dc.title | Modelling supercapacitors using a dynamic equivalent circuit with a distribution of relaxation times | en_US |
dc.type | Peer reviewed | |
dc.type | Journal article | |
dc.date.updated | 2020-01-24T13:54:34Z | |
dc.description.version | publishedVersion | en_US |
dc.rights.holder | Copyright 2019 The Author(s) | en_US |
dc.identifier.doi | https://doi.org/10.1016/j.est.2019.100912 | |
dc.identifier.cristin | 1720218 | |
dc.source.journal | Journal of Energy Storage | |