▎ 摘　　要

NOVELTY - Piezoelectric fiber composite material, is claimed. The piezoelectric fiber composite material is multi-layer composite structure, which is made by alternately stacking piezoelectric fiber layers and dielectric elastic fiber layers and carrying out hot-pressing treatment. USE - Used as piezoelectric fiber composite material. ADVANTAGE - The piezoelectric fiber composite material: has excellent piezoelectric properties, enhanced dielectric constant and no significant increase in dielectric loss; achieves technical effect of coexistence of high breakdown strength and high polarization level and thus improving the sensitivity and energy storage density of piezoelectric fiber materials; provides strategy for the development of flexible sensors and piezoelectric nanogenerator with high sensitivity and high energy storage performance; and has excellent mechanical properties. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing piezoelectric fiber composite material comprising (i) adding conductive filler into solvent I, and ultrasonically stirring until uniformly dispersed, then adding piezoelectric polymer to it, heating and stirring to obtain piezoelectric polymer solution doped with conductive filler, (ii) electrospinning the piezoelectric polymer solution obtained in step (i) to obtain first piezoelectric fiber layer, (iii) dissolving the dielectric elastomer polymer in solvent II, heating and stirring to obtain dielectric elastomer polymer solution, (iv) electrospinning the dielectric elastomer polymer solution obtained in step (iii) on the first piezoelectric fiber layer obtained in step (ii) to obtain first dielectric elastomer fiber layer, (v) spinning layer by layer from bottom to top according to the sequence of alternating piezoelectric fiber layers and dielectric elastomer fiber layers to prepare piezoelectric fiber composite structural layers, and (vi) subjecting the piezoelectric fiber composite structure layer obtained in step (v) to hot-pressing treatment so that adjacent piezoelectric fiber layers and dielectric elastomer fiber layers are closely combined to obtain final product.