Optimization of preparation conditions of spinel Li4/3Mn5/3O4 as a cathodematerial for rechargeable lithium battery

Li4/3Mn5/3O4 was prepared under various conditions to optimize its discharg e and charge characteristics as cathode materials for rechargeable lithium batteries. We found that the oxidation state of Mn ions and crystallinity o f Li4/3Mn5/3O4 strongly depended on the preparation temperature. The best r echargeability was obtained for the sample prepared at 550 degrees C in oxy gen atmosphere. This Li4/3Mn5/3O4 sample exhibited unique electrochemical a nd structural characteristics which were the very flat discharge and charge curves and the negligible structural change during the discharge and charg e cycling.