Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 13, Issue 9, Pages 938-941Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.06.005
Keywords
Na batteries; Electrode materials; Insertion compound; NaxVO(2) phases; Electrochemical process
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We report the electrochemical properties vs. Na of the layered NaxVO2 phases having either octahedral or trigonal prismatic symmetries. Both phases can reversibly insert 0.5 Na atom per unit formula leading to sustained reversible capacities of nearly 120 mAh/g. Their voltage profile shows numerous voltage steps being mainly associated to subtle ordering of the Na ions within the layers while each phase preserves its initial structure through the entire Na insertion deinsertion process. (C) 2011 Elsevier B.V. All rights reserved.
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