The present paper introduces a new method to prepare nano-NiCOH by oxidizing and cracking spherical Ni(OH)(2) of nano-structure in NaClO-NaOH solution. The prepared samples were characterized by X-ray powder diffraction (XRD), field emission scan electronic microscope (FESEM) and transmission electron microscopy (TEM). Results indicate that the synthesized sample is nano-NiCOH rod of 60-150 nm in width. The charge/discharge tests show that the nano-NiOOH cathode shows good cycling reversibility at high current density of 10,000 mAg(-1). provides a high capacity of 276 mAhg(-1) and reduces the charge time to as short as 1.83 min. Furthermore, the nano-NiOOH still keeps a reversible capacity of 93.7% after 120 cycles at a super high charge/discharge current of 10,000 mAg(-1), showing a good charge/discharge property. Crown Copyright (C) 2008 Published by Elsevier B.V. All rights reserved