Abstract
Mg-doped spinel LiMg0.05Mn1.95O4 was synthesized and coated with three types of Li-containing manganese oxides (Li2Mn4O9, Li4Mn5O12, and LiNi0.5Mn1.5O4) to improve the cycling properties at room temperature and at 50 °C via a coprecipitation method. The as-prepared spinels were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), inductively coupled plasma (ICP), and electrochemical tests. The results indicate that all the coated samples show enhanced electrochemical performance including higher initial charge-discharge capacities and more stable cycling properties as well as improved coulombic efficiency. Especially, the LiNi0.5Mn1.5O4-coated sample delivers the highest initial discharge capacity of 129 mAh/g with capacity retention of 82.5 % as well as the best coulombic efficiency of 92.1 %. This improved performance could be attributed to the enhanced electrochemical kinetics by successful surface modification of spinels with Li-containing manganese oxides via coprecipitation method.
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This work is financially supported by the National Natural Science Foundation (No. 2090504) and the opening subject of the State Key Laboratory of Electroanalytical Chemistry (SKLEAC201109).
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Wang, X., Wang, J., Wu, J. et al. Surface modification of Mg-doped spinel with different Li-containing manganese oxides. Ionics 21, 1851–1856 (2015). https://doi.org/10.1007/s11581-014-1364-0
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DOI: https://doi.org/10.1007/s11581-014-1364-0