Abstract
Bi-crystal lithium vanadate is synthesized with starting materials of V2O5 and LiF by one-step solid-state reaction. Since fluorine reacts with crucible made of silica, Li0.3V2O5-liked and LiV3O8-liked phases without F coexist in the produces. The stoichiometric proportion of two phases depends on the amount of dopant LiF. These are confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and transmission electron microscopy (TEM). Charge and discharge curves of bi-crystal materials present better reversibility of voltage plateaus than that of pure V2O5. The initial discharge capacity of Li0.3V2O5-liked phase dominated bi-crystal material is higher than pure V2O5. LiV3O8-liked phase dominated bi-crystal material has lower initial discharge capacity but delivers better cycling performance. Electrochemical impedance spectroscopy (EIS) measurements are performed to evaluate electrochemical kinetics of the bi-crystal materials. The results indicate that bi-crystal phase benefit the transfer resistance, interior diffusion resistance, and structure stability. Cathodes with different bi-phase structures have variable charge transfer resistance and lithium-ion diffusion speed due to this special structure.
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Acknowledgments
The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (grant numbers 51272179, 51102183), Shanghai Committee of Science and Technology (11 nm0501300, 13JC1408700), and National high-tech R-D program of china (863 program) (grant no.2013AA031801).
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Wang, J., Gao, G., Zhou, X. et al. A facile method to prepare bi-phase lithium vanadate as cathode materials for Li-ion batteries. J Solid State Electrochem 18, 2459–2467 (2014). https://doi.org/10.1007/s10008-014-2499-7
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DOI: https://doi.org/10.1007/s10008-014-2499-7