Abstract
As a promising Li-ion battery cathode active material, lithium-rich manganese-based layer-structured oxides suffer from inferior cycle performance and poor rate capability. Herein, Nb-doped Li1.2Mn0.54Ni0.13Co0.13O2 is prepared by a sol-gel method, and the effects of Nb doping on its electrochemical performance are investigated. It is concluded that the Nb-doped Li1.2Mn0.54Ni0.13Co0.13O2, has a good layered structure along c-axis independent on the amount of Nb dopant and little cationic mixing. Nb doping for Li1.2Mn0.54Ni0.13Co0.13O2 has no obvious influence on its morphology. It is found that Nb doping can enhance the electrochemical activity of Li1.2Mn0.54Ni0.13Co0.13O2, such as improved rate performance and cycle performance under high rate conditions. Li1.2Mn0.54Ni0.13Co0.13O2 doped with 0.015 Nb shows the best cycle performance under the high rate with the capacity maintenance of 95.4% after 100 cycles under 5 C rate, which is higher than that of the undoped one by 10.5%.
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