Jia-Jia Ren, Zhaochen Xi, Diming Xu, Hongmei Jing, Wenyuan Liu, Jinnan Liu, Zhentao Wang, Yang Liu, Tao Zhou, Houbing Huang, Weichen Zhao, Di Zhou
The miniaturization of modern electronic systems demands multilayer ceramic capacitors (MLCCs) capable of delivering high energy density without compromising efficiency or reliability. Herein, guided by phase-field simulations, this work establishes a rational design protocol that demonstrates the superiority of paraelectric modulation in maintaining robust polarization. We implement this strategy within a 0.88 Ba0.8Sr0.2TiO3-0.12Bi(Li0.5Ta0.5)O3 system via precise atomic-scale regulation. Multiscale characterization uncovers a critical structural duality: while high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) confirms the breakdown of global domains into polar nanoregions (PNRs), which are essential for minimizing hysteresis; piezoelectric force microscopy (PFM) and phase-field simulations reveal the preservation of medium-to-long-range ferroelectric correlations. This hierarchical architecture effectively reconciles high polarization with low energy loss. Consequently, the fabricated MLCCs achieve a high recoverable energy density of 10.17 J/cm3 and an exceptional efficiency of 98.3%. Furthermore, the devices exhibit robust operational stability under 691 kV/cm. This work provides a comprehensive pathway for advancing dielectric energy storage technology from theoretical prediction to reliable device fabrication.