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Herein, lithium-rich manganese-based cathode materials xLi2MnO3·(1 − x)LiNi0.5Co0.3Mn0.2O2 with different chemical components (x = 0. 4, 0.5, 0.6 and 0.7) were prepared by a simple co-precipitation method. The effects of different chemical components on the crystal structure and electrochemical properties of the lithium-rich manganese-based cathode materials were investigated by X-ray diffraction, X-ray photoelectron spectroscopy, charge–discharge, cyclic voltammetry and electrochemical impedance spectroscopy. The results indicate that the sample xLi2MnO3·(1 − x)LiNi0.5Co0.3Mn0.2O2 (x = 0.5) shows an optimum electrochemical performance: the first discharge capacity is high up to 240.71 mAh g−1 at 0.1 C; the discharge capacity can be maintained at 153 mAh g−1 after cycling 50 times when measured at a high rate of 2 C, and the good cycle stability at a high charge–discharge rate, where the discharge capacity was maintained at 123.26 mAh g−1 after 100 cycles at 5 C. Therefore, it can well balance the relationship between the specific capacity and rate capability.
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content/journals/10.1049/mnl.2018.5335
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Optimising electrochemical performance of lithium-rich manganese-based ternary cathode material xLi2MnO3·(1 − x)LiNi0.5Co0.3Mn0.2O2 by adjusting composition ratio