Lithium Insertion in Poly(ethylene oxide)/MoO_3 Xerogel Nanocomposite Films

摘要

The nanocomposite films were prepared by direct intercalation of poly ( ethylene oxide) and PEO into MoO_3 xerogel via sol-gel route. The electrochromic behavior and the chemical conditions of Li~+ ions were investigated by cyclic voltammograms, UV-visible spectral transmittance and XPS. The results show that the cycling efficiency and the reversibility of insertion/extraction of Li~+ ions in ( PEO)_1 MoO_3 · nH_2O nanocomposite film were improved. The intercalation of PEO into MoO_3 xerogel modulated the wavelength range of electrochromism and enhanced the electrochromic efficiency. Two different chemical conditions of Li~+ ions existing in the interlayer and interstitial positions of MoO_3 lattice were observed in MoO_3 xerogel and ( PEO)_1Mo(O_3 · nH_2O nanocomposite films.