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
Chemical sodiation of V2O5 at low temperatures allows to synthesize NaxV2O5 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 NaxV2O5 with different values of x was obtained. All these fractions belong to the α- or α′-phase, space group Pmmn.