Antiferroelectric materials are attractive for energy storage applications and are becoming increasingly important for power electronics. Lead-free silver niobate (AgNbO3) and sodium niobate (NaNbO3) antiferroelectric ceramics have reviced intensive interests...
Dielectric capacitors have aroused extensive attentions as energy storage devices in the past few decades on account of their extremely fast charging-discharging process and consequent high power density, great voltage endurance, and low cost, 1,2 which gives them a great advantage in the application of pulsed power and power electronics such as hybrid electric vehicles, radar transmitters, frequency inverters, pacemakers, and electric weapon systems. [3][4][5] However, low-energy storage density and efficiency are currently the most challenging problems of dielectric capacitors.As is well-known, high breakdown strength E b and dielectric constant ε r , large maximum polarization P max , small remnant polarization P r and coercive field E c are crucial to obtain high energy storage density and high efficiency simultaneously. [5][6][7] Dielectric polymers usually possess ultrahigh breakdown strength (≥5000 kV cm −1 ) but low dielectric constants (≤12), which limits their energy storage density. [8][9][10][11][12][13] In addition, relatively low maximum operating temperature
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