Abstract
Spherical β-Ni(OH) 2 was used as an active material of pasted positive electrode in a Ni-MH battery. To improve the performance of the positive electrode, the spherical β-Ni(OH) 2 particles (mean diameter 15 μm) were modified with electroless cobalt coating. Electrochemical properties such as discharge capacity and high-rate dischargeability of the positive electrode were generally improved by surface modification. Cyclic voltammetric studies indicated that due to the presence of cobalt coating on the surface of Ni(OH) 2 particles, the electrode exhibited a better reversibility of Ni(OH) 2 NiOOH redox reaction and the higher oxygen evolution overpotential. This apparently would increase the charge efficiency, improve utilization of active material and minimize concurrent oxygen evolution.
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