A facile room temperature chemical transformation approach for binder-free thin film formation of Ag2Te and lithiation/delithiation chemistry of the film

Abstract

The present work demonstrates a highly controllable, facile and environmentally friendly aqueous solution based synthetic method for oxide contamination-free Ag2Te thin films on desired substrates at room temperature using ion exchange induced chemical transformation of Ag/AgxO thin films. The films before and after chemical transformation reaction are characterized using an energy dispersive X-ray analyzer, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, thin film X-ray diffraction technique, high resolution transmission electron microscopy, and the selected area electron diffraction analysis technique. The as-deposited Ag2Te films show a highly crystalline nature even without thermal treatment. Furthermore, the electrochemistry for lithiation/delithiation of the Ag2Te film is studied for exploring its feasibility in the application as an anode material in a Li-ion battery. The experimentally estimated capacity of the Ag2Te electrode for Li storage is found to be about two and half fold larger than the theoretical capacity of the Ag2Te material. This implies that the binder-free Ag2Te film prepared by the current method could find a potential application in the Li-ion or other similar charge storing devices.