Abstract
VO2 obtained by hydrothermal synthesis from V2O5 was used as a matrix to obtain hybrid compounds containing different proportions of polyethylene oxide and chitosan. The XRD results demonstrate that monoclinic VO2 was obtained, and hybrid compounds showed variation in the displacement of the lamella peak, indicating an intercalation of polymers into the matrix. The stretching and vibration bands show a variation towards higher wavelength values of the hybrid compounds, which indicates that the intercalation of the polymers occurred into the matrix. The UV–Vis spectra show the absorptions that can be attributed to the transitions of each material. Absorption in the visible region decreases for hybrid compounds in relation to VO2. The hybrid compounds presented lower bandgap values compared to VO2. From cyclic voltammetry, it was possible to observe anodic and cathodic peaks linked to the redox process of the VIV/VIII pair for both VO2 and VO2/polymers, which is derived from the insertion/disinsertion process of lithium ions, where the hybrid compound presented a different voltammetric profile compared to VO2. The total charge curves as a function of the number of cycles demonstrate better cycling stability and a greater total charge of the hybrid compounds compared to VO2. These results demonstrate that hybrid compounds have potential as cathode materials for lithium-ion batteries.
Published Version
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