Year: 2026
Type: article
Abstract: Dielectric capacitors are crucial energy-storage modules in pulsed- and high-power devices. However, the simultaneous enhancement in recoverable energy density (Wrec) and efficiency (η) still remains challenge owing to the restrictive relationship between the maximum polarization (Pmax), remanent polarization (Pr) and electric breakdown strength (Eb). To address this, we propose a strategy of local polar structure design in BiFeO3-based ceramics. By incorporating NaNbO3 to create embedded, persistent polar nanoregions within a weakly polar matrix, we achieve a giant polarization difference ΔP (56.4 μC cm-2), a low Pr (3.6 μC cm-2) and a large Eb (66 kV mm-1), endowing an ultrahigh Wrec of 14.5 J cm-3 and a high η of 88%. The local structure, directly visualized via the 2D/3D atomic displacement mapping, enables a high Pmax under an applied field and a low Pr at zero field, a mechanism explicitly validated by phase-field simulation. Meanwhile, the optimized microstructure and enhanced insulating property contribute to a giant Eb. This work provides insights to overcome the paradox between multiple parameters and paves a feasible route for the cutting-edge energy-storage applications. The authors propose a local structure design to overcome the restrictive relationship between polarization behavior and electric field durability, yielding an ultrahigh Wrec of 14.5 J cm-3, which offers a feasible route for the cutting-edge energy-storage applications.
Source: Nature Communications
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Awards: G3203953842, G4175458532, G564178802
OpenAlex ID: W7147129359