The spinel LiMn2O4 used as cathode materials for lithium-ion batteries was synthesized by mechanochemistry fluid activation process, and modified by doping rare-earth Sm. Testing of X-ray diffraction, cyclic voltammog...The spinel LiMn2O4 used as cathode materials for lithium-ion batteries was synthesized by mechanochemistry fluid activation process, and modified by doping rare-earth Sm. Testing 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-ySmxO4 (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-discapacity 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.展开更多
基金Project (02JJY2081) supported by the Natural Science Foundation of Hunan Province
文摘The spinel LiMn2O4 used as cathode materials for lithium-ion batteries was synthesized by mechanochemistry fluid activation process, and modified by doping rare-earth Sm. Testing 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-ySmxO4 (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-discapacity 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.
