柠檬酸溶胶凝胶法制备LiCoO2电极材料及其表征

LiCoO₂ precursors of the cathode material for lithium-ion batteries were prepared from lithium hydroxide， basic cobalt carbonate and citric acid by a sol-gel method. The LiCoO₂ samples were obtained by sintering the gel pre-cursors at different temperatures and for different times. The thermal decomposition behavior of the gel precursors was examined by means of thermo-gravimetric analysis and differential thermal analysis using a PCT-IA thermal analyzer system. Their structures and morphologies were characterized by powder XRD and SEM techniques. It was found that using citric acid realized that the formation of LiCoO₂ crystal can be clearly differentiated to the nucle-ation and growth processes of the crystals; furthermore， the crystal size can be controlled. Electrochemical tests using the LAND BT1-10 test system showed the electrochemical performance of the material is affected by its in-tegrity and stability.