The concept of reversible and non reversible conversion in high bandgap metal fluorides is expanded through the introduction of mixed conducting matrices to form dense nanocomposite structures capable of good transport to nanodomains of metal fluorides. Specific examples for BiF3 and especially CuF2 using matrices of nominal composition of MoO 3 are discussed. The reversible conversion mechanism of the metal halides is expanded to enable a new concept of electrochemically self assembled microbatteries (ESAMs) based on alkali halides. Such technology enables the fabrication of a solid state microbattery between two current collectors of various configurations on the microscale. First examples demonstrated based on Lil have demonstrated cell formation, appreciable energy density, and preliminary reversibility.