Abstract <p>The process of preparation of vanadyl butoxyacetylacetate was studied, which was then used as a precursor in the synthesis of vanadium oxide by the sol-gel process using solvothermal treatment. After solvothermal treatment of the dispersed system obtained as a result of hydrolysis, vanadium dioxide powder in the monoclinic polymorphic modification VO₂(B) was obtained. In terms of microstructure, the powder consists of agglomerates with a likely large amorphous component, and the average size of coherent scattering regions was 9 ± 3 nm. The resulting powder was used to prepare functional inks, which were applied to deposit a vanadium oxide film by microextrusion printing. After heat treatment in air at 450°C, the formed film of V₂O₅ exhibited anodic electrochromism, changing color to pale blue upon reduction and to a less transparent yellow-orange upon oxidation. The optical contrast reached 16% at a wavelength of 500 nm, and the film’s coloration efficiency was 53.4 cm²/C. Compared to films obtained using this precursor by dip coating or spin coating methods, the same coloration and bleaching times are observed, as well as increased stability of the optical contrast value during cycling.</p>