Electrochromic properties of a series of Lix Niy O films were studied to obtain the films that give a good reversible electrochromic reaction in a nonaqueous electrolyte solution. We paid attention to the lithium content in the films. The films were deposited by radio-frequency (rf) magnetron sputtering with Lix Niy O targets under different conditions. The lithium contents were selected by using three different Lix Niy O targets. NiO pellets were also used for cosputtering with the targets to finely adjust the lithium content in Lix Niy O films. We found that a Lix Ni y O film gave a high electrochromic coloration efficiency when the lithium content in the film was adjusted to about 0.2. The X-ray diffraction (XRD) study showed that the crystalline Li2 Ni8 O10 film yielded good electrochromic performance, and that the (102) XRD peak was dominant in the films.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
- Surfaces, Coatings and Films
- Renewable Energy, Sustainability and the Environment
- Condensed Matter Physics