Enhancing Energy Density of BaTiO-Bi(M)O@SiO/PVDF Nanocomposites via Filler Component Modulation and Film Structure Design.

The low energy density () of polymeric dielectrics is unfavorable for the integration and miniaturization of electronics, thus limiting their application prospects. Introducing high- (dielectric constant) ceramic nanofillers to polymer matrices is the most common strategy to enhance their and hence their . By comparison, enhancing breakdown strength () is a more effective strategy to enhance . Herein, 0.6BaTiO-0.4Bi(MgTi)O and 0.85BaTiO-0.15Bi(MgZr)O nanofibers coated with SiO were utilized as fillers in PVDF-based nanocomposites. The combination of experimental and simulation results suggests that the intrinsic properties of nanofillers are the determining factor of the of polymer-based nanocomposites, and SiO coating and film structure design are effective strategies to enhance their , and consequently their . As a result, the sandwich-structured PVDF/6 wt% 0.85BaTiO-0.15Bi(MgZr)O@SiO nanofiber within PVDF/PVDF nanocomposite films achieved a maximum of 11.1 J/cm at an of 458 MV/m, which are 2.15 and 1.40 times those of pristine PVDF, respectively.