A vanadium oxy-phosphate Na 4 VO(PO 4 ) 2 as cathode material for Na ion batteries - Archive ouverte HAL
Article Dans Une Revue Solid State Sciences Année : 2017

A vanadium oxy-phosphate Na 4 VO(PO 4 ) 2 as cathode material for Na ion batteries

Résumé

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 10−4S/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 Na5VO(PO4)2. This study is a proof of the great versatility of vanadium V3+/V4+/V5+ ions in Na-based batteries.

Domaines

Matériaux
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Dates et versions

hal-02174122 , version 1 (04-07-2019)

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Citer

W. Deriouche, E. Anger, M. Freire, A. Maignan, N. Amdouni, et al.. A vanadium oxy-phosphate Na 4 VO(PO 4 ) 2 as cathode material for Na ion batteries. Solid State Sciences, 2017, 72, pp.124-129. ⟨10.1016/j.solidstatesciences.2017.08.017⟩. ⟨hal-02174122⟩
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