Abstract
LiNi0.85−x Co x Mn0.15O2 cathode material was prepared by a rheological phase reaction method with LiNO3, M(NO3)2 6H2O (M = Ni, Co, Mn), and citric acid as starting materials. The mixture of reactants and a proper amount of water reacted to form a rheological precursor. The rheological precursor was pretreated in autoclaves and then calcined at 750 °C under flowing oxygen. All the samples have a typical layered structure with space group R3-m and good electrochemical performances. The cobalt content has a significant effect on the electrochemical performance for the materials. LiNi0.65Co0.20Mn0.15O2 exhibits the best electrochemical properties in the five compounds. It gives an initial discharge capacity of 173.6mAhg−1 (50mA g−1, 3.0−4.3V), and the capacity rention after 50 cycles is 90.6%. This method is simple and effective for preparing cathode materials for lithium-ion batteries.
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