A semi theoretical approach of the second plateau appearing during the discharge of aged nickel oxyhydroxide electrodes

摘要

A semi theoretical explanation of the appearance of a second plateau during the discharge of overcharged nickel oxyhydroxide electrodes (NOHE) is proposed, based on transmission line models of the charge--discharge processes of the active matter. The model takes into account the double electronic and protonic conduction involved in nickel ll ∝ and β or nickel IlI P and γ phases. electrons and protons reach the transformation front inside the matter through the less resistive paths. The secondary plateau may occur when a resistive layer of β(II) isolates the transformation front from the nickel electron sink.