In order to overcome the capacity fading of LiCoO2 cathode material cycled in the voltage of 3.0-4.5 V (vs. Li/Li+), electrochemically active Li[Li0.2Mn0.6Ni0.2]O-2 was coated onto the surface of LiCoO2 by sol-gel method. The detrimental surface effects arising from the high Co-content are countered by the Li[Li0.2Mn0.6Ni0.2]O-2 coating. The surface morphology and structure of bare and coated LiCoO2 is characterized by scanning electron microscope (SEM) and X-ray diffraction spectroscopy (XRD). It is found that LiCoO2 exhibits better high-voltage performance after coating with Li[Li0.2Mn0.6Ni0.2]O-2 than before. Besides, the coating layer can significantly suppress the dissolution of Co in the electrolyte. Comparative data for the coated and uncoated materials are presented and discussed. (C) 2014 Elsevier Ltd. All rights reserved.