Abstract
Cr-doped Li3V2(PO4)3 cathode materials Li3V2−x Cr x (PO4)3 were prepared by a carbothermal reduction(CTR) process. The properties of the Cr-doped Li3V2(PO4)3 were investigated by X-ray diffraction (XRD), scanning electron microscopic (SEM), and electrochemical measurements. Results show that the Cr-doped Li3V2(PO4)3 has the same monoclinic structure as the undoped Li3V2(PO4)3, and the particle size of Cr-doped Li3V2(PO4)3 is smaller than that of the undoped Li3V2(PO4)3 and the smallest particle size is only about 1 μm. The Cr-doped Li3V2(PO4)3 samples were investigated on the Li extraction/insertion performances through charge/discharge, cyclic voltammogram (CV), and electrochemical impedance spectra(EIS). The optimal doping content of Cr was that x=0.04 in the Li3V2−x Cr x (PO4)3 samples to achieve high discharge capacity and good cyclic stability. The electrode reaction reversibility was enhanced, and the charge transfer resistance was decreased through the Cr-doping. The improved electrochemical performances of the Cr-doped Li3V2(PO4)3 cathode materials are attributed to the addition of Cr3+ ion by stabilizing the monoclinic structure.
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Funded by the Guangxi Natural Science Foundation(No. 0832259) and the National Basic Research Program of China (No. 2007CB613607)
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Zhong, S., Zhao, B., Li, Y. et al. Synthesis and electrochemical properties of Cr-doped Li3V2(PO4)3 cathode materials for lithium-ion batteries. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 24, 343–346 (2009). https://doi.org/10.1007/s11595-009-3343-2
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DOI: https://doi.org/10.1007/s11595-009-3343-2