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Electrochemical impedance studies of a decade-aged magnesium/manganese dioxide primary cell

Munichandraiah, N (1999) Electrochemical impedance studies of a decade-aged magnesium/manganese dioxide primary cell. In: Journal of Applied Electrochemistry, 29 (4). pp. 463-471.

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A Mg/MnO2 primary cell yields specific energy higher than a conventional Zn/MnO2 cell. Additionally, the shelf life of the Mg/MnO2 cell is extremely high. These cells, which were more than a decade old, were investigated for their discharge capacity, delay-time behaviour and impedance characteristics. The values of discharge capacity and the delay-time of an aged Mg/MnO2 cell were comparable to those of a fresh cell. The voltage dip on initiation of a galvanostatic current, however, was rather large. This was attributed to the presence of a thick, and highly resistive, surface passive film on theMg anode. The complex plane electrochemical impedance spectrum of a partially discharged cell consisted of two semicircles whose sizes decreased with decrease of state-of-charge of the cell. The a.c. frequency corresponding to the maximum value of the imaginary part of the high frequency semicircle was shown to be a useful parameter for estimation of the state-of-charge of the cell. The resistance parameters of a partially discharged Mg/MnO2 cell increased linearly with open circuit ageing time. This feature was attributed to growth of a passive surface layer on the Mg anode.

Item Type: Journal Article
Publication: Journal of Applied Electrochemistry
Publisher: Kluwer Academic Publishers
Additional Information: Copyright of this article belongs to Kluwer Academic Publishers.
Keywords: a.c. impedance;discharge delay-time;Mg/MnO2 primary cell;state-of-charge;surface passive film on Mg
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 13 Sep 2006
Last Modified: 27 Aug 2008 12:18
URI: http://eprints.iisc.ac.in/id/eprint/8196

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