Abstract
Single-phase LiVPO4F and LiVPO4F/Li3V2(PO4)3 nanostructured composite cathode materials were prepared by heating of the VPO4 + LiF mechanochemically activated mixture to 700 °C and subsequent quick or slow cooling to room temperature, respectively. The formation of the composites was proved by a combination of different physico-chemical methods, including XRD, FTIR, 6Li and 31P NMR, SEM, TEM, and HRTEM. It has been shown that in the composites LiVPO4F and Li3V2(PO4)3 nanocrystals well inset into each other resulting in the nanodomain composite formation. Charge–discharge curves of the composites have a sloping profile both in the high-voltage (3.0–4.5 V) and in the low-voltage (1.3–2.5 V) ranges, noticeably different from plateaus for a phase-pure LiVPO4F, thus indicating a probable change of a two-phase regime of lithium intercalation for a single-phase one. Enhanced rate capability of the LiVPO4F/Li3V2(PO4)3 composites is associated with their microstructure and high ionic conductivity of Li3V2(PO4)3.
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Acknowledgments
The authors are thankful to V. Podugolnikov for XRD structural refinement and to Dr. A. Titov for SEM study. The work was partially supported by the Ministry of Education and Science of Russian Federation (state contract no. 16.518.11.7091).
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Kosova, N.V., Devyatkina, E.T., Slobodyuk, A.B. et al. LiVPO4F/Li3V2(PO4)3 nanostructured composite cathode materials prepared via mechanochemical way. J Solid State Electrochem 18, 1389–1399 (2014). https://doi.org/10.1007/s10008-013-2213-1
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DOI: https://doi.org/10.1007/s10008-013-2213-1