Tailoring Phase Fraction Induced Saturation Polarization Delay for High-Performance BaTiO-Based Relaxed Ferroelectric Capacitors.

Electrostatic capacitors based on dielectric materials are essential for enabling technological advances, including miniaturization and integration of electronic devices. However, maintaining a high polarization and breakdown field strength simultaneously in electrostatic capacitors remains a major challenge for industrial applications. Herein, a universal approach to delaying saturation polarization in BaTiO-based ceramic is reported via tailoring phase fraction to improve capacitive performance. The ceramic of 0.85(0.7BaTiO-0.3BiNaTiO)-0.15BiLi(TiTa)O delivers an ultrahigh recoverable energy density () of 7.16 J cm along with an efficiency (η) of approximately 90% at a breakdown electric field of 700 kV cm, outperforming the current BaTiO-based ceramics and other lead-free ceramics. Meanwhile, the and η exhibit wide frequency, temperature, and cycling fatigue stability. Additionally, both an extremely fast discharge time of 115 ns and a large power density of 106.16 MW cm are concurrently attained. This work offers a promising pathway for delaying saturation polarization design in order to create scalable high-energy-density ceramics capacitors and highlight the research prospects of pulse power applications.