Studies of electrochemical properties of lithium cobalt oxide

The electrochemical characteristics of high-temperature (HT) LiCoO2 (900 °C) and low-temperature (LT) LiCoO2 (450 °C) were studied. From cyclic voltammetry results, lithium intercalating into LT-LiCoO2 generates two current peaks at 3.8 and 3.3 V, respectively, which is contrast to the intercalation of lithium into HT-LiCoO2. The resistance of lithium extraction is smaller than that of lithium insertion. The diffusion coefficients of Li+ ions in LiCoO2 have an order of 109− cm2/s.