Abstract
Lithium nickel manganate is recognized as a type of promising cathode material for lithium-ion battery, due to its advantages such as high voltage, high power density, and relative lower cost. In this paper, a series of LiNi x Mn2 − x O4 cathode materials with various molar ratio of Ni/Mn have been prepared with a co-precipitation method, followed by a solid state reaction, and the effect of the molar ratio of Ni/Mn on the structure and properties of materials are intensively investigated by means of X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM), and performance measurements, etc. It is revealed that all the samples with x from 0 to 0.5 have well-defined spinel structure and fit well to Fd-3 m space group. With the increase of the molar ratio of Ni/Mn, the diffraction peaks shift to higher angle slightly and the lattice parameter decreases gradually by the XRD results. Furthermore, it is found that the capacity at the 4.0 V plateau decreases while the capacity at 4.7 V plateau increases with the increase of the ratio of Ni/Mn, and the total discharge capacity shows growth trend with the increase of Ni content. It is important that all the samples with various molar ratio of Ni/Mn exhibit good cyclic stability. Based on the experimental results, we suggest that the Ni may incorporate into the lattice of LiMn2O4 substituting of Mn. The plateau at 4.7 V is related to the Ni ions and the plateau at 4.0 V is related to the Mn ions in the materials.
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Acknowledgments
This work was supported by the National Science Foundation of China (NSFC Project Nos. 21076089, 21276098, 11132004, U1301245), Guangdong Natural Science Foundation (Project No S2012020011061), Doctoral Fund of Ministry of Education of China (20110172110012), and Doctoral Fund of Department of Education of Guangdong.
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Ren, W., Luo, R., Liu, Zs. et al. Effect of Ni/Mn ratio on the performance of LiNi x Mn2 − x O4 cathode material for lithium-ion battery. Ionics 20, 1361–1366 (2014). https://doi.org/10.1007/s11581-014-1114-3
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DOI: https://doi.org/10.1007/s11581-014-1114-3