Substitution of aluminum for nickel in the lattice of nickel hydroxide, prepared by co-precipitation, leads to hydrofalcite-like compound of of-nickel hydroxide. This compound has been used as the electrochemical active material in the positive electrodes of rechargeable alkaline batteries. Cyclic voltammetric studies suggest that or-nickel hydroxide displays better reversibility of the Ni(OH)(2)/NiOOH redox couple. The mechanism of the electrode reaction is still found to be controlled by proton diffusion, and the proton diffusion coefficient differs with the content of aluminium.