Electrochemical Na-deintercalation from NaVO₂

Christophe Didier (1) , Marie Guignard (1) , Cathy Denage (1) , Olivier Szajwaj (1) , S. Ito (1) , Ismaël Saadoune (1, 2) , Jacques Darriet (1) , Claude Delmas (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 LCME - Département de Chimie

This paper describes the preparation of Na_xVO₂ phases by means of electrochemical deintercalation. The curves V = f(x) show that the process is reversible up to x = 0.5 and they indicate the presence of multiple single phase domains in the range 1 < x < 0.5. Two single phases have been successfully isolated for Na_1/2VO₂ and Na_2/3VO₂ compositions; we report here the first X-ray powder diffraction measurements of these phases. They present a O'3-type monoclinic distortion of the O3 rhombohedral phase observed for Na₁VO₂. The evolution of cell parameters with sodium deintercalation is comparable with other A_xMO₂ layered oxides.

Mots clés: Crystal structure; Electrochemistry; Intercalation compounds; Materials preparation; Sodium compounds; X-ray diffraction

Domaines: Matériaux

Christophe Didier, Marie Guignard, Cathy Denage, Olivier Szajwaj, S. Ito, et al.. Electrochemical Na-deintercalation from NaVO₂. Electrochemical and Solid-State Letters, 2011, 14 (5), pp.A75-A78. ⟨10.1149/1.3555102⟩. ⟨hal-00576017⟩