Lithium insertion in poly(ethylene oxide)/MoO₃ xerogel nanocomposite films

Abstract

The nanocomposite films were prepared by direct intercalation of poly(ethylene oxide) and PEO into MoO₃ 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)₁MoO₃·nH₂O nanocomposite film were improved. The intercalation of PEO into MoO₃ 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 MoO₃ lattice were observed in MoO₃ xerogel and (PEO)₁MoO₃·nH₂O nanocomposite films.

Keywords

Lithium insertion / electrochromism / intercalation / PEO / MoO₃ xerogel / nanocomposite film

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