Abstract
The sol-gel synthesis of metal oxides offers new possibilities in the field of solid state ionics. The chemical design of molecular precursors allows a better control of the polymerization process so that taylor-made materials could be obtained. New hybrid organic-inorganic compounds exhibit high ionic conductivities and could be used as electrolytes. Oxide gels are actually particle hydrates. Water adsorption and dissociation at the oxide-water interface are responsible for their properties as ion exchangers or fast proton conductors. Colloidal particles are very small so that the large solid-liquid interface provides improved electrochemical properties which can be used for making reversible cathodes or electrochromic devices. The sol-gel deposition of thin coatings of large area could open the possibility to make multilayer micro-ionic devices.
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