Layered LiAldeltaNi1-deltaO2 solid solutions were synthesised via a solid-state reaction at 750 degrees C under an oxygen stream. Single phase LiAldeltaNi1-deltaO2 compounds were obtained. The structural integrity of the electrode could be preserved via an inert Al3+ dopant effect to prevent the overcharge of the electrode, which is beneficial for long cycle life of the cell. The LiAldeltaNi1-deltaO2 electrode delivered approximately 150-160 mAh/g discharge capacity between 3 and 4.3 V, which is similar to LiNiO2. A.c. impedance spectroscopy was employed to characterise the kinetic parameters of LiAldeltaNi1-deltaO2 electrodes in lithium cells combined with the galvanostatic intermittent titration technique (GITT). It was found that the Al3+ dopant effect could decrease the charge-transfer resistance (R-CT) and increase the Li-ion diffusion coefficient.