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Inorganics 2017, 5(2), 19;

Na1+yVPO4F1+y (0 ≤ y≤ 0.5) as Cathode Materials for Hybrid Na/Li Batteries

Institute of Solid State Chemistry and Mechanochemistry SB RAS, 18 Kutateladze, Novosibirsk 630128, Russia
Author to whom correspondence should be addressed.
Received: 22 February 2017 / Revised: 20 March 2017 / Accepted: 23 March 2017 / Published: 27 March 2017
(This article belongs to the Special Issue Novel Lithium Battery Electrode Materials)
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Using Rietveld-refined X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and electrochemical cycling, it was established that among sodium vanadium fluorophosphate compositions Na1+yVPO4F1+y (0 ≤ y ≤ 0.75), the single-phase material Na1.5VPO4F1.5 or Na3V2(PO4)2F3 with a tetragonal structure (the P42/mnm S.G.) is formed only for y = 0.5. The samples with y < 0.5 and y > 0.5 possessed different impurity phases. Na3V2(PO4)2F3 could be considered as a multifunctional cathode material for the fabrication of lithium-ion and sodium-ion high-energy batteries. The reversible discharge capacity of 116 mAh•g−1 was achieved upon cycling Na3V2(PO4)2F3 in a hybrid Na/Li cell. Decrease in discharge capacity for the other samples was in accordance with the amount of the electrochemically active phase Na3V2(PO4)2F3. Na3V2(PO4)2F3 showed good cycleability and a high rate of performance, presumably due to operation in the mixed Na/Li electrolyte. The study of the structure and composition of charged and discharged samples, and the analysis of differential capacity curves showed a negligible Na/Li electrochemical exchange, and a predominant sodium-based cathode reaction. To increase the degree of the Na/Li electrochemical exchange in Na3V2(PO4)2F3, it needs to be desodiated first in a Na cell, and then cycled in a lithium cell. In this case, the electrolyte would be enriched with the Li ions. View Full-Text
Keywords: Na3V2(PO4)2F3; NaVPO4F; XRD; hybrid Na/Li batteries Na3V2(PO4)2F3; NaVPO4F; XRD; hybrid Na/Li batteries

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Kosova, N.V.; Rezepova, D.O. Na1+yVPO4F1+y (0 ≤ y≤ 0.5) as Cathode Materials for Hybrid Na/Li Batteries. Inorganics 2017, 5, 19.

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