Abstract
Dielectric capacitors with large power densities are indispensable components in advanced electric and electronic devices. However, the limited energy density and efficiency are challenging and badly restrict their utilization in practice. Here, fine-grains, increased resistivity and activation energy, optimized maximum polarization, and benign relaxation features are simultaneously achieved in AgNbO3-based ceramics via a multi-scale synergistic design, combining hydrothermal methods with Bi and Sr doping. As a result, we synergistically realized high breakdown strength of 702 kV/cm, large recoverable energy storage density of 7.9 J/cm3 and benign energy efficiency of 75.5 % in (Ag0.80Bi0.04Sr0.04)NbO3 ceramics. Furthermore, excellent temperature-, frequency-, cycling-stability and ultrahigh discharge energy density of 5.6 J/cm3 were simultaneously achieved in (Ag0.80Bi0.04Sr0.04)NbO3 ceramics, indicating a promising candidate for competitiveness and development in advanced high-power applications.
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