Journal
SOLID STATE SCIENCES
Volume 72, Issue -, Pages 124-129Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2017.08.017
Keywords
Vanadium phosphate; Na-ion batteries; Na4VO(PO4)(2)
Funding
- CNRS, DCSRT Tunisie through the project CoopIntEER cooperation CNRS-Tunisie [EDC25954]
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The Na4VO(PO4)(2) phase has been synthesized using a solid state route in sealed tubes. This phase crystallizing in the orthorhombic system has a one-dimensional structure built up of corner shared VO6 and PO4 polyhedra. It is an ionic conductor with a conductivity of 10(-4)S/cm at 500 K and an activation energy of 0.63eV. The electrochemical properties of Na4VO(PO4)(2) as a positive electrode in a sodium ion battery have been studied. Results show the possibility of extracting almost one sodium through a two-phase process at 3.4 V leading to the phase Na3.2VO(PO4)(2) and to insert as well one sodium at low potential 1.5 V, to form through a solid solution process the reduced phase Na6VO(PO4)(2). This study is a proof of the great versatility of vanadium V3+/V4+/V5+ ions in Na-based batteries. (C) 2017 Elsevier Masson SAS. All rights reserved.
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