Inducing superior discharged energy density of the nanocomposite films with CsPbBr3 in-situ dispersed in ferroelectric polymer

Polymer-based capacitors are regarded as paramount components in advanced electrical systems due to their intrinsically superior breakdown strength (E-b) and excellent processability. Although the enhancement of dielectric constant (epsilon(r)) of polymer-based composites has been realized by loading high-epsilon(r) inorganic fillers, this approach confronts considerable challenges in filler agglomeration. In this research, CsPbBr3 (CPB) nanoparticles are via in-situ in ferroelectric polymers [P(VDF-HFP)] to form high-quality nanocomposites. epsilon(r) and E-b of the nanocomposites are concomitant enhancement via introduction of only 0.1 wt% CPB, leading to an ultrahigh U-d similar to 24.1 J cm(-3) at 705 MV m(-1) with superior efficiency (eta) of 64 % and stability up to 2.5 x 10(4) charge-discharge cycles. COMSOL Multiphysics simulations further demonstrate that the in-situ prepared composites are conducive to inhibiting the growth of electric trees caused by inhomogeneous electric field distribution. This contribution extends the synthesis method to prepare perovskites-polymer dielectrics and provides a novel strategy for fabricating high-performance polymer-based composite capacitors.

Automated summary

In this research, high-quality nanocomposites were formed by in-situ synthesis of CsPbBr3 nanoparticles in ferroelectric polymers P(VDF-HFP). The introduction of only 0.1 wt% CPB resulted in a simultaneous enhancement of the dielectric constant and breakdown strength of the nanocomposites, leading to an ultrahigh energy density, high efficiency, and stability. This study provides a novel strategy for fabricating high-performance polymer-based composite capacitors by synthesizing perovskite-polymer dielectrics.