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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/25043

Title: An impedance model for EIS analysis of nickel metal hydride batteries
Authors: Cruz-Manzo, Samuel
Greenwood, Paul S.
Chen, Rui
Keywords: EIS
Electrical circuit
Impedance model
NiMH battery
NiMH electrochemistry
Issue Date: 2017
Publisher: © The Electrochemical Society
Citation: CRUZ-MANZO, S., GREENWOOD, P.S. and CHEN, R., 2017. An impedance model for EIS analysis of nickel metal hydride batteries. Journal of The Electrochemical Society, 164 (7), pp. A1446-A1453.
Abstract: Based on fundamental electrochemical theory, an impedance model for analysis of electrochemical impedance spectroscopy (EIS) of Nickel-Metal Hydride (NiMH) batteries is presented in this study. The resulting analytical expression is analogous to the impedance response of the Randles electrical circuit used for EIS analysis on NiMH batteries. The impedance model is validated against EIS measurements carried out whilst decreasing the state of charge (SOC) of a NiMH battery pack. The diffusion mechanisms during the discharge of the NiMH battery is modelled through a Warburg element derived from diffusion theory considering reflective boundary conditions. ZView Scribner Associates Inc. software allowed the estimation of electrochemical and diffusion parameters from EIS measurements of the NiMH battery. The effect of diffusion mechanisms on EIS measurements is discussed. The results demonstrate that ion transport is the rate-limiting process during the discharge of the NiMH battery. This EIS-modelling study has provided an insight into the interpretation of battery electrochemical mechanisms represented in the Nyquist plot from EIS. It can assist to further EIS-modelling to study and correlate State of Health (SOH) in NiMH batteries for different applications.
Description: This paper was accepted for publication in the journal Journal of The Electrochemical Society and the definitive published version is available at http://dx.doi.org/10.1149/2.0431707jes
Version: Accepted for publication
DOI: 10.1149/2.0431707jes
URI: https://dspace.lboro.ac.uk/2134/25043
Publisher Link: http://dx.doi.org/10.1149/2.0431707jes
ISSN: 0013-4651
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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