The characteristics of the lithium electrode were examined in an organic and a polymeric electrolyte of interest for the development of rechargeable batteries. Results obtained by frequency response analysis and by polarization curves, were used to identify charge-transfer resistance, double layer capacity and properties of passivation films.
Titanium dioxide in its anatase form may react with lithium by a reversible intercalation process. This process is accompanied by a marked colour change, so that TiO 2 is of interest for the development of electrochromic displays. The electrochromic properties of thin film electrodes, obtained by a deposition on a tin oxide coated glass substrate of a TiO 2 dispersion in polyvinylalcohol, are examined in this work. The results show that the rate of the electrochromic process is controlled by the diffusion of the Li + ions throughout the TiO 2 lattice. Consequently, it is convenient to drive the electrochromic process with potentiostatic pulses and, effectively, under these conditions many cycles with initial good colour contrast and efficiencies which approach 100%, have been obtained with the TiO 2 thin film electrodes.
As part of a research program on the electrochemical behaviour of solid materials which may be used as cathodes in voltage-compatible lithium—organic electrolyte batteries, we have considered here cuprous sulphide, cadmium sulphide and lead sulphide.
The oxidation, p-doping processes of various types polyacetylene electrodes in lithium cells with LiClO4+propylene carbonate electrolyte, have been examined by cyclic voltammetry and frequency response analysis. The results show that the kinetics of the p-doping process are controlled by the diffusion of the dopant species in the bulk of the polymer. Such a slow diffusion influences the charge-discharge coulombic efficiency noticeably and the charge retention of the polymeric electrode.
The electrochemical reaction of iron oxide (α-Fe2O3) with lithium in an organic electrolyte cell has been investigated by cyclic voltammetry, polarization curves, atomic absorption analyses and Mössbauer spectroscopy.
