A study of lithium insertion into vanadium-titanium oxide by electrochemical quartz crystal microbalance

摘要

Vanadium-titanium oxide has been proposed as an optically passive counter electrode in an electrochromic device. This work presents an electrochemical quartz crystal microbalance study of the material. Reactive magnetron sputtered vanadium-titanium oxide electrodes were studied. The electrochemical behavior of the films was investigated using slow scan cyclic voltammetry, which showed a parasitic reaction superimposed on the insertion/extraction current. The quartz crystal microbalance in-situ measurements showed a linear change of mass with the charge density corresponding with the insertion of lithium ions only. During a slow extraction, an increase of the slope showed an additional loss of mass, which could be due to the corrosion of the vanadium-titanium oxide film.