Abstract
In recent studies, the layered composites with Li2MnO3 and LiMO2 have become as the promising cathode materials for lithium ion batteries due to the high capacity of around 250 mAh/g with a lower cost and better safety in comparison with LiCoO2.In this study, a PAAM(Polyacrylamide)-assisted carbonate co-precipitation method was attempted to prepare the spherical Li[Li0.2Mn0.534 Ni0.133Co0.133]O2 cathode material. With the F-doping, the particle size of Li[Li0.2Mn0.534 Ni0.133Co0.133]O1.95F0.05 decreased, which was beneficial for the electrochemical properties. After 80cycles at 0.05C, the capacity was 259 mAh/g and the retention was 90% for Li[Li0.2Mn0.534 Ni0.133Co0.133]O1.95F0.05. After 200 cycles at 0.1C, 0.2C and 0.3C, the retention was 94%, 93% and 95%, respectively. The cycling properties was improved obviously with F-doping. From the results of synchrotron radiation XRD, the structures were changed with the temperature from the ambient temperature to 500 °C for Li[Li0.2Mn0.534 Ni0.133Co0.133]O2. But no structural changes were observed for Li[Li0.2Mn0.534 Ni0.133Co0.133]O1.95F0.05. Hence, the structural stability was improved further with F-doping.
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