Synthesis and electrochemical properties of $LiCoO_2$ powders by urea hydrolysis

Lithium cobalt oxide cathode powders for rechargeable battery have been successfully prepared using urea hydrolysis method. The obtained hydrolysis-derived precursors with different Li/Co molar ratio were calcined at various temperatures. Low temperature phase and high temperature phase were obtained after calcination at for 2 hr, and phase transformation from was completely occurred over . The layered structure of was well developed with a rise in the calcination temperature. Charge-discharge test show that the lithium cobalt oxide with 1.2 molar ratio prepared at has an initial discharge capacity as high as 152 mAh/g, and the relatively stable cycling characteristic with 9.2 % of capacity fading was obtained after 40th charge-discharge test.