Achieving ultrahigh energy storage density and efficiency in 0.90NaNbO-0.10BaTiO ceramics a composition modification strategy.

Ceramic capacitors feature great power density, fast charge/discharge rates, and excellent thermal stability. The poor energy storage density of ceramic capacitors, on the other hand, significantly limits their application in power systems. In this work, a high recoverable energy storage density of = 2.68 J cm and an ultrahigh efficiency of = 90% are simultaneously achieved in the 0.90NaNbO-0.10BaTiO ceramic by doping (BiLa)(MgTa)O (NNBT-BLMT). Due to its high bandgap, the NNBT-0.10BLMT ceramic has a large dielectric breakdown strength (BDS) of 414 kV cm, consistent with the first-principles calculation based on density functional theory (DFT). Moreover, the NNBT-0.10BLMT ceramic exhibits excellent charge/discharge characteristics, with an ultrahigh current density of 526.06 A cm and a high power density of 52.61 MW cm. In particular, the NNBT-0.10BLMT ceramic exhibits an outstanding temperature (20 °C-110 °C), frequency (10 Hz-120 Hz), and cycling (10 cycles) stability, highlighting its application potential in MLCCs.