On Impedance Spectroscopy of Supercapacitors


Cite item

Full Text

Open Access Open Access
Restricted Access Access granted
Restricted Access Subscription Access

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

Supplementary files

Supplementary Files
Action
1. JATS XML

Copyright (c) 2016 Springer Science+Business Media New York