Nathirabegum, S. and Muralidharan, V.S. and Basha, C.A. (2009) Electrochemical investigations and characterization of a metal hydride alloy (MmNi3.6Al0.4Co0.7Mn0.3) for nickel metal hydride batteries. Journal of Alloys and Compounds, 467 (1-2). pp. 124-129. ISSN 0925-8388

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Abstract

The use of new hydrogen absorbing alloys as negative electrodes in rechargeable batteries has allowed the consideration of nickel/metal hydride (Ni/MH) batteries to replace the conventional nickel cadmium alkaline or lead acid batteries. In this study the performance of trisubstituted hydrogen storage alloy (MmNi3.6Al0.4Co0.7Mn0.3) electrodes used as anodes in Ni/MH secondary batteries were evaluated. MH electrodes were prepared and the electrochemical utilization of the active material was investigated. Cyclic voltammetric technique was used to analyze the beneficial effect of the alloy by various substitutions. The electrochemical impedance spectroscopic measurements of the Ni/MH battery were made at various states of depth of discharge. The effect of temperature on specific capacity is studied and specific capacity as a function of discharge current density was also studied and the results were analyzed. The alloy metal hydride electrode was subjected to charge/discharge cycle for more than 200 cycles. The discharge capacities of the alloy remains at 250 mAh/g with a nominal fading in capacity (to the extent of ∼20 mAh/g) on prolonged cycling.

Item Type:	Article
Uncontrolled Keywords:	Rare earth alloys and compounds; Energy storage materials; Metal hydrides; Transition metal alloys and compounds; Electrochemical reactions; Electrochemical impedance spectroscopy
Subjects:	Corrosion Science and Engineering Electrochemical Power Sources
Divisions:	UNSPECIFIED
Depositing User:	TTBD CECRI
Date Deposited:	01 Apr 2012 17:29
Last Modified:	01 Apr 2012 17:29
URI:	http://cecri.csircentral.net/id/eprint/392

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