Abstract
Based on the experimental impedance spectra, the electrochemical reactions that are deposed at the electrode-electrolyte interface can be modeled by equivalent electrical circuits. Each element used in the circuit must have a physical correspondence in the electrochemical system. In this work, a model has been proposed to a NiMH battery electrode to describe, in detail, the electrochemical process at the interface of this electrode. The theoretical impedance of a proposed circuit is a function of several variables. These adjusted variables to reach a good agreement between the theoretical spectra and the experimental spectra in the studied frequency. The Z-simplex software allows refining the experimental results. These results show a good superposition between the experimental spectra and the theoretical spectra corresponding to the proposed electric circuit. This leads to the conclusion that the proposed circuit describes the phenomena that take place at the interface of the hydride electrode.
Highlights
Nowadays, the commercial portable energy storage devices such as lead-acid battery, Lithium Ion Battery (LIB), and nickel-based alkaline battery are frequently used in electric vehicles because of their large energy density
To understand the different phenomena that flow to the electrode-electrolyte interface, different electrochemical method such as Chronopotentiometry, Chronoamperometry and cyclic voltammetry, are techniques in large signals that only inform the slowest step of the electrochemical process
Modeling electrochemical impedance spectroscopy is usually done using equivalent electrical circuits. These circuits have parameters that need to be estimated properly in order to make possible the simulation of impedance data. Electrochemical impedance spectroscopy it used to analyze the electrochemical response of a system subjected to a small amplitude perturbation around a given operating point characterized by the current-potential (I0, E0)
Summary
The commercial portable energy storage devices such as lead-acid battery, Lithium Ion Battery (LIB), and nickel-based alkaline battery are frequently used in electric vehicles because of their large energy density. Modeling electrochemical impedance spectroscopy is usually done using equivalent electrical circuits.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
