Improving electrochemical performance of LiCoO₂ BY TiO ₂ coating as cathode for aqueous rechargeable lithium batteries

Modified LiCoO₂ was prepared via a sol-gel method followed by a TiO₂ 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 LiCoO₂. The initial capacity of the TiO ₂-coated LiCoO₂ 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 LiCoO₂, and shows no evident capacity fading after 100 cycles.