Synthesis and Electrochemical Properties of 0.5Li2MnO3•0.5LiMn0.5Ni0.5O2

The precursor of Mn0.75Ni0.25CO3 is prepared by carbonate co-precipitation method. And the cathode material 0.5Li(2)MnO(3)center dot 0.5LiMn(0.5)Ni(0.5)O(2) is synthesized with two stages calcining temperatures T1 and T2. T1 represents 400 degrees C, 500 degrees C, 600 degrees C and T2 is selected at 750 degrees C, 850 degrees C, 950 degrees C respectively. XRD Patterns shows that the cathode material has the integrated structures of Li2MnO3 and LiMO2, and it has better crystallization during the rise of calcined temperature at 950 degrees C. The electrochemical performances tests indicates that the initial discharge specific capacity are greater than 220mAh/g at the current density 0.2 mA/cm(2) in 2.5-4.6V at room temperature. When cathode material is calcined at 750 degrees C, its discharge specific capacity even reach to 248mAh/g, but the cathode material has more perfect general electrochemical properties during calcined temperature at 950 degrees C.