Electrochemical studies of aluminum substituted α-Ni(OH)2 electrodes

Stabilized α-Ni(OH)2 was used as an active material of pasted positive electrode in Ni/MH battery. Electrochemical properties such as discharge capacity and discharge potential were improved. Cyclic voltammetric studies indicated that α-Ni(OH)2electrode exhibited a better reversibility of Ni(OH)2/NiOOH redox reaction and higher oxygen evolution overpotential than β-Ni(OH)2 electrode. This apparently would increase the charge efficiency, improve utilization of active material and minimize concurrent oxygen evolution.