Synthesis and Electrochemical Studies of Spinel LiNi1−xMnxVO4 |
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Authors: | Qiong Yu Lai Ji Zheng LuXiao Bo Su Xiao Yang Ji |
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Institution: | a Chemical College of Sichuan University, Chengdu, 610064, Chinab Analytical and Testing Center of Sichuan University, Chengdu, 610064, China |
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Abstract: | Spinel compound LiNi1−xMnxVO4 (0≤x≤0.4) had been prepared by using the moist chemical method. X-ray diffraction spectra showed that the lattice constant increased with x in the LiNi1−xMnxVO4, XPS spectra indicating that Li1s had a chemical shift towards lesser binding energy, and manganese in LiNi1−xMnxVO4 existing as the mixed valence of Mn2+ and Mn3+. The electrochemical charge and discharge testing at a current density of 0.1 mA/cm2 between the potentials of 4.0 and 3.0 V vs Li/Li+ in 1 mol/dm3 LiPF6/EC+DEC (1:1 by volume) at 25°C showed that LiNi1−xMnxVO4 cell has a better rechargeability, but a lower cell voltage of 4.0 V vs Li/Li+ than that without the doping sample, and the capacity and the cycle efficiency of the Li/LiNi1−xMnxVO4 cells increased with x in the LiNi1−xMnxVO4. |
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Keywords: | lithium-nickel-manganese-vanadate inverse spinel substitution moist chemical method synthesis electrochemical characteristic |
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