PIEZOELECTRIC COMPOSITE MATERIALS HAVING IMPROVED PIEZOELECTRIC PROPERTIES

A piezoelectric composite material is based on a polymeric matrix and on piezoelectric inorganic fillers, characterized in that the material additionally comprises at least one ionic liquid of general formula Q+ A−, in which Q+ represents a cation chosen from quaternary ammonium cations and quaternary phosphonium cations and A− represents any anion capable of forming a liquid salt at a temperature of less than 100° C. A device comprising at least one layer based at least one piezoelectric composite material defined above and at least two electrodes positioned on either side of the layer and a tire comprising at least one piezoelectric device defined above are also set forth.