Abstract
The spinel LiMn2O4 used as cathode materials for lithium-ion batteries was synthesized by mechano-chemistry fluid activation process, and modified by doping rare-earth Sm. Thesting of X-ray diffraction, cyclic voltammograms, charge-discharge and SEM was carried out for LiMn2O4 cathode materials and the modified materials. The results show that the cathode materials doped rare earth LixMn2−ySmzO4 (0.95⩽x⩽1.2, 0⩽y⩽0.3, 0⩽z⩽0.2) exhibit standard spinel structure, high reversibility of electrochemistry and excellent properties of charge-discharge. In EC: DMC(1 : 1)+1 mol/L LiPF6 electrolyte with discharge capacity more than 130 mA · h/g, and its capacity is deteriorated less than 15% after 300 cycles at room temperature and less than 20% after 200 cycles at 55°C. At the same time, Crystal Field Theory was applied to explain the function and mechanism of doped rare earth element.
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Foundation item: Project (02JJY2081) supported by the Natural Science Foundation of Hunan Province
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Peng, Zd., Hu, Gr. & Liu, Yx. Influence on performance and structure of spinel LiMn2O4 for lithium-ion batteries by doping rare-earth Sm. J Cent. South Univ. Technol. 12 (Suppl 1), 28–32 (2005). https://doi.org/10.1007/s11771-005-0366-5
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DOI: https://doi.org/10.1007/s11771-005-0366-5