6533b7cffe1ef96bd125979e

RESEARCH PRODUCT

<title>Functional models of electrochromic devices: cycling capacity and degradation</title>

subject

description

Electrical transfer and diffusion of ions and the irreversibility of ion and electron processes in heterojunctions are responsible for degradation of ionic devices. These processes for electrochromic devices (ECD) determine the cycling capacity and lifetime. The basic problem here is how to match the electrochemical parameters (including chemical potential) of heterojunction. The experiments had been carried out on ECD based on system: (phi) - -(phi) , where AAH is solid electrolyte based on antimony acid hydrates. The cycling capacity and degradation processes of ECD are investigated by electro-optical and electro-chemical spectroscopy. The analysis of experimental data are based on assumption that electrode reactions changed composition of electrode and electrolyte materials and surface layers as well as constitution of heterojunction's interface. The conclusions of these investigations and problem analyses are some considerations about electrochemical battery model and cycling capacity of ECD. That depends on reversibility of solid state reactions on the electrode and ion insertion processes and phase stability of electrode and electrolyte materials. The ions of sublattices of immobile ions of solid phases and other components of these phases have to be stable against chemical interactions, diffusion and transfer of mobile ion during cycling.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.