Near-Zero Energy Consumption Capacitors by Controlling Inhomogeneous Polarization Configuration

Taking into account the need for energy conservation, achieving near-zero energy loss, namely ultrahigh efficiency (eta), in energy storage capacitors with large recoverable energy storage density (Wrec) plays an important role in applications, which is one of the major challenges in dielectric energy storage field. Here, guided by phase-field simulation, inhomogeneous polarization configuration with multiple symmetries and polarization magnitudes is controlled through aliovalent strongly polar double ion design to establish a strongly disordered state. A record-high eta of approximate to 97.4% is realized in lead-free relaxors with a large Wrec of approximate to 8.6 J cm-3, which also give a giant Wrec of approximate to 11.6 J cm-3 with an ultrahigh eta of approximate to 96.1% through high-energy ball milling, showing a breakthrough progress in ceramic capacitors with a maximum figure of merit of 330. This work demonstrates that controlling inhomogeneous polarization configuration is an effective avenue to develop new high-performance near-zero energy loss energy storage capacitors. Near-zero energy loss with a record-high efficiency of approximate to 97.4% and a maximum figure of merit of 330 are realized in BaTiO3-based lead-free ceramic capacitors by aliovalent strongly polar double ion design to control inhomogeneous polarization configuration with multiple symmetries and polarization magnitudes, giving a giant recoverable energy storage density of approximate to 11.6 J cm-3 with an ultrahigh efficiency of approximate to 96.1%. image