Abstract
Vanadium bronzes NayV2O5 are synthesized via the hydrothermal route from a mixture of V2O5 and NaOH in the presence of a reducing agent. Fine crystalline powders made of needle-like particles are obtained that exhibit the layered structure typical of the α′-NayV2O5 phase (y≈1). Electron delocalization arises from a hopping process of unpaired electrons between V4+ and V5+. Alkaline cations are intercalated between the oxide layers and discharge curves show that up to one Li+ ion per vanadium can be reversibly inserted between the [V2O5] layers in the 3.3–0.5 V range. Chemical diffusion coefficient of Li ions in LixNaV2O5 is found to be dependent on the degree of intercalation. D+ varies from 1×10−10 up to 5×10−10 cm2/s for 0≤×≤2.
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Bouhedja, L., Castro-Garcia, S., Livage, J. et al. Lithium intercalation in α′-NayV2O5 synthesized via the hydrothermal route. Ionics 4, 227–233 (1998). https://doi.org/10.1007/BF02375950
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DOI: https://doi.org/10.1007/BF02375950