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

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 acti...

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Bibliographic Details
Published in:Chemistry of materials 2016-09, Vol.28 (18), p.6637-6643
Main Authors: Sun, Meiling, Rousse, Gwenaëlle, Saubanère, Matthieu, Doublet, Marie-Liesse, Dalla Corte, Daniel, Tarascon, Jean-Marie
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Physics
Online Access:Get full text
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Summary: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.
ISSN:0897-4756
1520-5002
DOI:10.1021/acs.chemmater.6b02759