2014.02

2014.02

Chemical Sodiation of V₂O₅ by Na₂S

Robert Haberkorn*, Jessica Bauer, Guido Kickelbick

Z. Anorg. Allg. Chemie 640/15 (2014) 3197-3202

Article first published online: 9 OCT 2014

DOI: 10.1002/zaac.201400381

Abstract

Chemical sodiation of V₂O₅ at low temperatures allows to synthesize Na_xV₂O₅ with 0 ≤ x ≤ 1, while classic high temperature syntheses yield in either x ≤ 0.02 (α-phase) or 0.7 ≤ x (α′-phase), or other phases (β-phase, δ-phase) or mixtures thereof. A suspension of V₂O₅ in acetonitrile and Na₂S as sodiation agent were used. The maximum amount of sodiation was obtained by using an excess of Na₂S, refluxing the acetonitrile during the reaction, and precedent ball milling of the V₂O₅. If only low amounts of Na₂S were used as starting material, a mixture of fractions of Na_xV₂O₅ with different values of x was obtained. All these fractions belong to the α- or α′-phase, space group Pmmn.