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A2VO(SO4)2 (A = Li, Na) as Electrodes for Li-Ion and Na-Ion Batteries

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journal contribution
posted on 30.08.2016, 00:00 by Meiling Sun, Gwenaëlle Rousse, Matthieu Saubanère, Marie-Liesse Doublet, Daniel Dalla Corte, Jean-Marie Tarascon
We herein report the synthesis, crystal structure, and electrochemical performances of a new Li-based vanadium oxysulfate phase, Li2VO­(SO4)2, whose structure is built on vanadyl-containing VO5 square-based pyramids and SO4 groups linked by vertices to form layers. Li2VO­(SO4)2 presents a redox activity at 4.7 V vs Li+/Li0 with a reversible capacity of 50 mA·h/g, while the chemically similar but structurally different Na2VO­(SO4)2 delivers a capacity of 60 mA h/g at 4.5 V vs Na+/Na0. Density functional theory calculations are also performed to rationalize our findings in terms of redox activity and phase stability.

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