On Impedance Spectroscopy of Supercapacitors
- Authors: Uchaikin V.V.1, Sibatov R.T.1, Ambrozevich A.S.1
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Affiliations:
- Ulyanovsk State University
- Issue: Vol 59, No 6 (2016)
- Pages: 845-855
- Section: Optics and Spectroscopy
- URL: https://bakhtiniada.ru/1064-8887/article/view/237318
- DOI: https://doi.org/10.1007/s11182-016-0844-2
- ID: 237318
Cite item
Abstract
Supercapacitors are often characterized by responses measured by methods of impedance spectroscopy. In the frequency domain these responses have the form of power-law functions or their linear combinations. The inverse Fourier transform leads to relaxation equations with integro-differential operators of fractional order under assumption that the frequency response is independent of the working voltage. To compare long-term relaxation kinetics predicted by these equations with the observed one, charging-discharging of supercapacitors (with nominal capacitances of 0.22, 0.47, and 1.0 F) have been studied by means of registration of the current response to a step voltage signal. It is established that the reaction of devices under study to variations of the charging regime disagrees with the model of a homogeneous linear response. It is demonstrated that relaxation is well described by a fractional stretched exponent.
About the authors
V. V. Uchaikin
Ulyanovsk State University
Author for correspondence.
Email: vuchaikin@gmail.com
Russian Federation, Ulyanovsk
R. T. Sibatov
Ulyanovsk State University
Email: vuchaikin@gmail.com
Russian Federation, Ulyanovsk
A. S. Ambrozevich
Ulyanovsk State University
Email: vuchaikin@gmail.com
Russian Federation, Ulyanovsk
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