Ionic conducting gels, preparation method thereof and use of same

Ionogels as obtained by implementation of a process comprising a stage of mixing an ionic liquid with at least one molecular precursor of general formula:

• R′x(RO)4-xSi
• in which:
• x is an integer varying from 0 to 4,
• R represents an alkyl group with 1 to 4 carbon atoms, and
• R′ is selected from the group consisting of an alkyl group with 1 to 4 carbon atoms, an aryl group with 6 to 30 carbon atoms, and a halogen atom, and, optionally, in the presence of a carboxylic acid, the mixture then being left to stand for one or more days until a gel is obtained, formed by polycondensation of the molecular precursor(s), containing within it the ionic liquid, wherein,
• the ionogels are monolithic solids,
• the ionogels are stable up to temperatures of approximately 350° C.,
• the ionogels transparent, and
• the ionogels are ionic conductors having an ionic conductivity of between approximately 10−4 and 10−3 S.cm−1 at ambient temperature and between 10−2 and 10−1 at 230° C.