Nanosized cathode material Ni(OH) 2 for alkaline batteries was prepared by converting the precursor of NiC 2 O 4 .2H 2 O in KOH water solution which contained Tween-80, and the precursor was obtained via the reaction between Ni(NO 3 ) 2 .6H 2 O and H 2 C 2 O 4 .2H 2 O in ethanol solvent. The products were characterized using X-ray diffraction (XRD), infrared absorption spectroscopy (IR), and transmission electron microscopy (TEM). The results showed that the as-prepared Ni(OH) 2 sample by this method is β(II)-type phase and its shape is spherical with the particle size from 5 to 35nm. The electrochemical studies revealed that the 10% addition of nanosized Ni(OH) 2 to common microsized spherical Ni(OH) 2 can improve the electrochemical performance of the Ni(OH) 2 electrode. There exists approximately a 10% improvement in the utilization of the active material of the Ni(OH) 2 electrode with 10% nannosized Ni(OH) 2 addition in comparison with microsized spherical Ni(OH) 2 electrode. Nanosized Ni(OH) 2 may be a promising cathodic active material for alkaline rechargeable batteries.