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Ceramics based piezoelectric generators are known for their high energydensity and poor flexibility. In this work, v_r-PMN-0.3PT/PDMS 2-2 compositewith optimum PMN-0.3PT content (v_r) was designed that demonstrated enhancedoutput energy density and superior mechanical flexibility under dynamicmechanical excitation. v_r-PMN-0.3PT/PDMS 2-2 composite with different PMN-PTreinforcement content (v_r) and two different reinforcement configurations werefabricated and characterized for effective electro-elastic properties andenergy harvesting response. Parallelly, using the finite element method andanalytical models, effective electromechanical properties were calculated.Composites with parallel connectivity of the reinforcement phase demonstratedenhanced piezoelectric charge coefficient even with low PMN-0.3PT contentwhereas the relative permittivity and elastic modulus exhibited a linearlyincreasing trend with reinforcement volume fraction. At a compressive load of50 N and 5 Hz frequency, a piezoelectric generator (PG) based on a v_r = 0.2,v_r- PMN-0.3PT/PDMS 2-2 composite with parallel connectivity produced a maximumshort-circuit current density of 69 nA/cm2 and an open-circuit electric fieldof 189 V/cm, translating to a maximum output power density of ~13 {\mu}W/cm3higher than that of pristine PMN-0.3 PT based piezoelectric generator.Estimated mechanical flexibility was found to be ~53 % higher than that ofpristine PMN-0.3PT.

Improving the energy density and flexibility of PMN-0.3PT based piezoelectric generator by composite designing