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

作者：Sun Meiling; Rousse Gwenaelle; Saubanere Matthieu; Doublet Marie Liesse; Dalla Corte Daniel; Tarascon Jean Marie

来源：Chemistry of Materials, 2016, 28(18): 6637-6643.

DOI：10.1021/acs.chemmater.6b02759

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 VQ(5) 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+/Li-0 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+/Na-0. Density functional theory calculations are also, performed to rationalize our findings in terms of redox activity and phase stability.

• 出版日期2016-9-27