IMPROVING ELECTROCHEMICAL PERFORMANCE OF LiCoO2 BY TiO2 COATING AS CATHODE FOR AQUEOUS RECHARGEABLE LITHIUM BATTERIES

Modified LiCoO 2 was prepared via a sol–gel method followed by a TiO 2 coating and characterized by X-ray diffraction analysis, transmission electronic microscopy and various measurements of charge/discharge behavior. Its cycling performance and rate capability were greatly improved compared to the original LiCoO 2 . The initial capacity of the TiO 2 -coated LiCoO 2 is 134 mAh g -1 at the current density of 5000 mA g -1 . When the current density increases to 10,000 mA g -1 , the cathode displays an initial capacity of 128 mAh g -1 , much higher than that (<101 mAh g -1 ) for the virginal LiCoO 2 , and shows no evident capacity fading after 100 cycles.