Abstract
LiFePO4 was doped by metallic cation in Fe sites via ball milling by a solid-state reaction method synthesis, and with very low-level doping of these samples, such as Li0.95T0.05FePO4 (where T = Mn2+, Co2+, La3+, Ce4+). The effects of doping were studied by X-ray diffraction pattern, Raman shift, scanning electronic microscopy and energy-dispersive X-ray spectroscopy as sample characterizations. The results indicate that these dopants have no significant effect on the structure of the material, but considerably improve its electrochemical behavior. First-principles calculations were used to obtain the migration pathway of Li ions along the one-dimensional (010) direction in LiFePO4, and molecular dynamics simulation was used to investigate the lithium-ion diffusion coefficients (D Li) inside LiFePO4, which were derived from the slope of the mean square displacement versus time plots. The evolution of the structure during the simulation was analyzed by the radial distribution function to obtain the data, and radial distribution functions and mean square displacements were used to confirm the formation of crystalline units and the evolution of structure.
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Acknowledgments
This work was supported by the Technology Innovation Program (10041957, Design and Development of fiber-based flexible display) funded by the Ministry of Trade, Industry & Energy (MI, Korea) and was also partially supported by the Student Research Fellowship program of Dongguk University.
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Xiao, Y., Zhang, F.C. & Han, J.I. Synthesis, characterization and lithium-ion migration dynamics simulation of LiFe1−x T x PO4 (T = Mn, Co, La and Ce) doping cathode material for lithium-ion batteries. Appl. Phys. A 122, 980 (2016). https://doi.org/10.1007/s00339-016-0503-z
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DOI: https://doi.org/10.1007/s00339-016-0503-z