A Study on the Electrochemical Properties of LiNi 0.8 Co 0.2-x M x O 2 [M

The has shown outstanding electrochemical properties. The microstructure of cathode was investigated by using TEM (transmission electron microscopy) and X-ray diffraction techniques. The was produced by sol-gel method to synthesize fine particles less than in the average diameter. In this study, emphasis was given to the examination and interpretation of the microstructural change during charge-discharge cycling experiments, which appeared to be one of the main causes of early degradation of rechargeable batteries. Results showed that the cathode produced by sol-gel method had high reversible capacity and excellent cycling stability due to its homogeneous distribution of Ni and Co cations on u atomic scale. In particular, the cathode did not show severe strain induced structural defects or cubic spinel disordering during cycling experiments, which had been observed in the conventional cathode. The $LiNi_{0.8}Co_{0.2-x}M_x[M