Structural and electrochemical characterization of mesoporous thin films of Nb2xV2−2xO5 upon lithium intercalation

Lithium transition metal (Ti, Nb, V) oxide mesoporous thin films: Contrasting results when attempting direct synthesis by evaporation-induced self assembly

“…The Li-free 0.5V-0.5Nb-0Li-1EO film crystallizes as NbVO 5 at 520°C, as expected [16]. Addition of lithium to the precursor solutions lowers the crystallization temperature to 500°C (see Table 2 for the list of phases and SI-4b for the XRD patterns).…”

“…On the other hand, vanadium is much more troublesome, due to its various oxidation states and reluctance of V 5+ species to achieve adequate curvature [4]. Combining Nb and V makes it easier to obtain mesoporosity [13,16]. Comparison of the different cases is expected to provide insight into the consequences of lithium addition in the sol-gel solution.…”

Mesoporous lithium vanadium oxide as a thin film electrode for lithium-ion batteries: comparison between direct synthesis of LiV2O5 and electrochemical lithium intercalation in V2O5

“…Besides, the atmospheric ellipsometry porosimetry characterization (discussed later in this section) indicates an accessible porosity of 26%, similar to the value found for VNbO 5 MTFs templated by the same PS-b-PEO structuring agent but which could be heated to a higher temperature (520 C) without collapse of the mesostructure. 23 The decomposition of the PS-b-PEO structuring agent in these VNbO 5 MTFs was found to be completed by 350 C (10 C min À1 heating) using thermal ellipsometric analysis. 18 All these results suggest that the Li-V-O lm obtained aer 1 minute at 400 C is no longer a hybrid lm but indeed a MTF.…”

Mesoporous thin films: properties and applications

“…EC response higher than that of the corresponding dense films has been observed in titania anatase viologen modified mesoporous films, 131,132 in titania mesoporous multilayered coatings 79 and in Nb 2x V 2À2x O 5 mesoporous films. 133…”