Ultrahigh Energy-Storage in Dual-Phase Relaxor Ferroelectric Ceramics.

Adv Mater

Department of Physical Chemistry, Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China.

Published: November 2024

AI Article Synopsis

  • High-performance dielectric energy-storage ceramics improve electrostatic capacitors but face challenges in balancing polarizability and breakdown strength for optimal energy density.
  • A new dual-phase structure is created using (BiNa)TiO-BaTiO ceramics, which enhances performance through phase separation and a solid-state reaction method.
  • These ceramics achieve a record energy density of 23.6 J/cm³ with 92% efficiency while exhibiting high polarization, low hysteresis, and increased resistivity, promising better energy-storage capabilities in ferroelectrics.

Article Abstract

High-performance dielectric energy-storage ceramics are beneficial for electrostatic capacitors used in various electronic systems. However, the trade-off between reversible polarizability and breakdown strength poses a significant challenge in simultaneously achieving high energy density and efficiency. Here a strategy is presented to address this issue by constructing a dual-phase structure through in situ phase separation. (BiNa)TiO-BaTiO-based relaxor ferroelectric ceramics are developed, creating a grain-separated dual perovskite phase structure using a facile solid-state reaction method. These ceramics feature two interactive relaxor phases with diversified nanoscale polar structures and heterogeneous grain boundaries, synergistically contributing to high polarization with low hysteresis, substantially increased resistivity, and suppressed electrostrain. Remarkably, a record-high energy density of 23.6 J cm with a high efficiency of 92% under 99 kV mm is achieved in the bulk ceramic capacitor. This strategy holds promise for enhancing overall energy-storage performance and related functionalities in ferroelectrics.

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Source
http://dx.doi.org/10.1002/adma.202410088DOI Listing

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