Influence on performance and structure of spinel LiMn2O4 for lithium-ion batteries by doping rare-earth Sm |
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Authors: | Peng Zhong-dong Hu Guo-rong and Liu Ye-xiang |
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Affiliation: | (1) School of Metallurgy Science and Engineering, Central South University, 410083 Changsha, China |
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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 Li
x
Mn2−y
Sm
z
O4 (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.
Foundation item: Project (02JJY2081) supported by the Natural Science Foundation of Hunan Province |
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Keywords: | lithium-ion batteries Sm cathode material rare-earth LiMn2O4 |
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