PREPARATION AND ELECTROCHEMICAL CHARACTERIZATION OF TRANSITION METAL OXIDE PARTICLES PREPARED IN SUPERCRITICAL WATER

摘要

LiCoO_2 particles were prepared in supercritical water under optimized preparation conditions using flow type cell. The preparation of LiCoO_2 was finished within 30 sec. The particles size of LiCoO_2 was easily controlled with changing the flow rate. LiCoO_2 particles prepared in this study have 1.0 μm, diameter. These particles exhibited a hexagonal shape. An electron diffraction pattern for LiCoO_2 hexagonal particle did not show any rings, indicating that the LiCoO_2 particle prepared in this study has a nature of single crystal. The discharge and charge characteristics of the LiCoO_2 were good for battery applications. Thus, the preparation of cathode materials using supercritical water is one of good candidates as a new preparation process for rechargeable lithium batteries.