Abstract
The barium potassium niobate‐based glass‐ceramics with high energy‐storage density, high discharge efficiency, and fast discharge speed have been prepared. It was found that dielectric breakdown strength decreases when the crystallization temperature increases. Glass‐ceramics have high energy‐storage density up to 14.58 ± 1.14 J/cm3 with high breakdown strength of 2382 ± 92 kV/cm. Discharge energy density and discharge efficiency of glass‐ceramic capacitor were achieved through a pulse charge–discharge circuit. The reduction of discharge efficiency with the increase of crystallization temperature is mainly caused by interfacial polarization.
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