By A. Zimmerman
Nickel-hydrogen battery cells supply one of many longest-lived and top-rated rechargeable battery structures ever constructed. The Aerospace company used to be instrumental within the study, improvement, and checking out of such batteries. basically built to be used in satellite tv for pc and house strength structures, their really lengthy lifestyles was once worth the excessive fee linked to the expertise, they usually quickly changed lots of the nickel-cadmium batteries utilized in prior satellites. This publication presents the reader with an in-depth view of nickel-hydrogen mobilephone expertise: the way it was once constructed, How and why it really works, tips on how to enforce and discover its final strength, and What can get it wrong whether it is now not effectively managed.
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Additional info for Nickel-Hydrogen Batteries - Principles and Practice
Thus, a full understanding of the W response of a nickel-hydrogen cell during discharge depends on the amount of y-NiOOH present in the nickel electrode. An added complexity in the W curves of nickel-hydrogen cells during recharge can be caused by a-Ni(OH),, which is the discharge product of y-NiOOH. 4. Phases generated in each of the recharge voltage regions typically seen for a nickel-hydrogen cell. 5. Normal C/2 discharge of a nickel-hydrogen cell compared to discharge following extensive cycling that converted -50% of the active material to y-NiOOH.
8 shows how pressure changes and charge or discharge current affect cell voltage for typical recharge and discharge. 7. Variation in typical nickel-hydrogen cell discharge voltage with temperature at a C/2 discharge rate. 28 Voltage vs. 8. Dependence of the voltage of nickel-hydrogen cells (in mV/decade) on hydrogen pressure and the logarithm of the current density (as afraction of the Gratingfor the cell). 2 Cell Power Response The power response of a nickel-hydrogen cell during discharge depends directly on the internal resistance of the cell, as indicated by the slopes of the discharge W curves illustrated in Fig.
The principal ones are cobalt or cadmium in the nickel electrodes, and lithium in the electrolyte. Of these, cobalt is consistently used at either a 5% or 10% level in the nickel electrodes to provide significantly improved performance and life, as will be discussed in more detail in chapter 4. Cadmium additives improve the charge efficiency of the nickel electrodes by poisoning the oxygen evolution reaction that occurs in overcharge. However, cadmium additives can lead to dendritic short circuits and can poison the platinum catalyst in the hydrogen electrodes.