Preparation and electrochemical characterization of LiCo62 single crystal particles prepared by super critical water synthesis (SCWS)

LiCoOz single crystal particles were obtained by super critical water synthesis (SCWS) under optimized preparation conditions. The particle size of the LiCoOz was less than l um, which was much smaller than that of LiCoOa prepared by a standard method. However, some unknown crystalline and amorphous phases coexisted with the well defined LiCoU2 single crystal particles. The discharge and charge characteristics of the LiCoOî prepared by the SCWS were examined by some electrochemical methods. In the first cycle, an irreversible behavior was observed, and then the gradual decrease of the discharge capacity with discharge and charge cycle was also detected. The stable discharge capacity was estimated to be 80 mA h g"1 after the 100th cycle. This result may be due to the existence of amorphous phases and some structural defects.