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Batteries 2016, 2(2), 6; doi:10.3390/batteries2020006

Electrochemical Open-Circuit Voltage and Pressure-Concentration-Temperature Isotherm Comparison for Metal Hydride Alloys

1
Department of Chemical Engineering and Materials Science, Wayne State University, Detroit, MI 48202, USA
2
BASF/Battery Materials-Ovonic, 2983 Waterview Drive, Rochester Hills, MI 48309, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Jossen
Received: 27 January 2016 / Revised: 5 March 2016 / Accepted: 15 March 2016 / Published: 23 March 2016
(This article belongs to the Special Issue Nickel Metal Hydride Batteries)
View Full-Text   |   Download PDF [1423 KB, uploaded 23 March 2016]   |  

Abstract

In this study we compared the electrochemical pressure-concentration-temperature (EPCT) method with the gaseous phase pressure-concentration-temperature (PCT) method and demonstrated the differences between the two. Experimentally, this was done by electrochemically charging/discharging the electrodes of four different metal hydride (MH) alloys. The results indicate that in the PCT curve is flatter with a smaller hysteresis and a higher storage capacity compared to the EPCT curve. Moreover, while the PCT curves (up to around one third of the hydrogen storage capacity) reside in between the charge and discharge EPCT curves, the rest of the PCT curves are below the EPCT curves. Finally, we demonstrated a new calibration method based on the inflection points observed in the EPCT isotherms of a physical mixture of more than one alloy. This turning point can be used to find a preset calibration point to determine the state-of-charge. View Full-Text
Keywords: metal hydride (MH); electrochemistry; pressure composition isotherm; electrochemical pressure-concentration-temperature (EPCT); state of charge (SOC) estimation metal hydride (MH); electrochemistry; pressure composition isotherm; electrochemical pressure-concentration-temperature (EPCT); state of charge (SOC) estimation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mosavati, N.; Young, K.-H.; Meng, T.; Ng, K.Y.S. Electrochemical Open-Circuit Voltage and Pressure-Concentration-Temperature Isotherm Comparison for Metal Hydride Alloys. Batteries 2016, 2, 6.

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