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The galvanostatic charge and discharge technique was used for the evaluation of the changes in electrochemical parameters of the tested metal hydride electrodes during the repeated hydrogen absorption and desorption processes. Higher development of the effective surface area during hydrogenation has been obtained for LaNi 4.3 Co 0.4 Zn 0.1 Al 0.2  composite electrode. For the conditions of current ± 0.5 C, the discharge capacities of LaNi 4.2 Co 0.4 Zn 0.1 Al 0.3  and LaNi 4.3 Co 0.4 Zn 0.1 Al 0.2  alloys are 240 and 316 mAh × g −1 , respectively. From the point of view of improving the kinetics of the process of charge transfer at the electrode/electrolyte interface as well as a resistance to self-discharging, a partial substitution of nickel with zinc in the LaNi 4.3 Co 0.4 Al 0.3  alloy is not favorable.

Electrochemical properties of LaNi 4.2 Co 0.4 Zn 0.1 Al 0.3 and LaNi 4.3 Co 0.4 Zn 0.1 Al 0.2 alloys as anode materials for Ni-MH batteries