Tailoring phase evolution via high-entropy engineering for superior energy storage properties in (Na0.5Bi0.5)0.75Sr0.25TiO3-based ceramics

High-entropy engineering has garnered significant attention for innovation of dielectric capacitors. However, to meet the demands of the burgeoning market for next-generation advanced capacitors, challenges remain in optimizing the recoverable energy-storage density (Wrec). To address this, a stepwise high-entropy tactic is proposed via integrating four core effects of high-entropy systems with phase transition and energy-storage performance. This technique induces a remarkable Wrec 7.4 J/cm3 at 400 kV/cm in (Na0.5Bi0.5)0.75Sr0.25Ti1-x(Al1/4Zr1/4Hf1/4Nb1/4)xO3 ceramics (x = 0.00, 0.08, 0.12, 0.16, 0.20). The incorporation of multiple ions with diverse radii and valence states at the B-site enhances the degree of disorder and lattice distortion, contributing to tuning phase evolution and suppressing interfacial polarization, thereby delaying saturation polarization. Furthermore, impressive thermal endurance (30 130 degrees C), frequency stability (1 100 Hz) and a rapid discharge rate t0.9 of 37.6 ns are also yielded. This work paves the way for the advancement of novel ceramics by tailoring phase transition using a high-entropy strategy.