Abstract
Frequency-dependent capacitance C(ω) is a rapid and reliable method for the determination of the state-of-charge (SoC) of electrochemical storage devices. The state-of-the-art of SoC monitoring using impedance spectroscopy is reviewed, and complemented by original 1.5-year long-term electrical impedance measurements of several commercially available supercapacitors. It is found that the kinetics of the self-discharge of supercapacitors comprises at least two characteristic time constants in the range of days and months. The curvature of the Nyquist curve at frequencies above 10 Hz (charge transfer resistance) depends on the available electric charge as well, but it is of little use for applications. Lithium-ion batteries demonstrate a linear correlation between voltage and capacitance as long as overcharge and deep discharge are avoided.
Funder
Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst
Subject
Electrical and Electronic Engineering,Electrochemistry,Energy Engineering and Power Technology
Reference36 articles.
1. Electrochemical Supercapacitors: Scientific Fundamentals and Technological Applications;Conway,1999
2. Supercapacitors: Materials, Systems, and Applications;Beguin,2013
3. Electrochemical Double Layer Capacitors;Kurzweil,2015
4. Critical Review on the Battery State of Charge Estimation Methods for Electric Vehicles
5. A review on lithium-ion battery ageing mechanisms and estimations for automotive applications
Cited by
34 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献