Achieving ultrahigh energy storage density in super relaxor BCZT-based lead-free capacitors through multiphase coexistence

Dielectric capacitors own great potential in next-generation energy storage devices for their fast charge-discharge time, while low capacity limits commercialization. Enormous lead-free ferroelectric ceramic capacitor systems have been reported recent decades, and density has increased rapidly. By comparing with some fashioned materials or techniques, which lacks repeatability, as latterly, we proposed a unique but straightforward way to boost the modified conventional system. Through stoichiometric ratio regulation, coexistence of C-phase T-phase was obtained 0.85(Ba1-xCax)(ZryTi1-y)O3-0.15BiSmO3-2 wt. % MnO ceramics x = 0.1 y 0.15 under proof combination Rietveld XRD refinement transmission electron microscope measurement. The Wrec 3.90 J/cm3, an excellent value BCZT-based at present stage, because co-contribution optimization electric field distribution additional interfacial polarization triggered higher fields. finite element simulation physical deduction, fits very well our experimental result, were also performed. As practical application, stable performance long-time cycle frequency stability obtained, discharge behaviors achieved.