Giant Energy Storage Density with Antiferroelectric‐Like Properties in BNT‐Based Ceramics via Phase Structure Engineering

Abstract

Driven by the information industry, advanced electronic devices require dielectric materials which combine both excellent energy storage properties and high temperature stability. These requirements hold the most promise for ceramic capacitors. Among these, the modulated Bi0.5Na0.5TiO3 (BNT)‐based ceramics can demonstrate favorable energy storage properties with antiferroelectric‐like properties, simultaneously, attaching superior temperature stability resulted from the high Curie temperature. Inspired by the above properties, a strategy is proposed to modulate antiferroelectric‐like properties via introducing Ca0.7La0.2TiO3 (CLT) into Bi0.395Na0.325Sr0.245TiO3 (BNST) ((1−x)BNST‐xCLT, x = 0.10, 0.15, 0.20, 0.25). Combining both orthorhombic phase and defect dipole designs successfully achieve antiferroelectric‐like properties in BNST‐CLT ceramics. The results illustrate that 0.8BNST‐0.2CLT presents superior recoverable energy storage density ≈8.3 J cm−3 with the ideal η ≈ 80% at 660 kV cm−1. Structural characterizations demonstrate that there is the intermediate modulated phase with the coexistence of the antiferroelectric and ferroelectric phases. In addition, in situ temperature measurements prove that BNST‐CLT ceramics exhibit favorable temperature stability over a wide temperature range. The present work illustrates that BNT‐based ceramics with antiferroelectric‐like properties can effectively enhance the energy storage performance, which provides novel perspectives for the subsequent development of advanced pulsed capacitors.

Achieving outstanding energy storage behaviors via combinatorial optimization design in BNT-based relaxor ferroelectric ceramics under medium–low electric fields

“…Furthermore, a comparison with recent reported work on lead-free ceramic energy storage properties is presented in Table 1. 8,23,27–37 Our work is very significant as it not only maintains higher W rec and η , but also has a leading W rec / E under a low electric field. (1 − x )BNT–BZT– x NN ceramics will shine in future energy storage components of power systems.…”

Enhanced energy storage capabilities in PbHfO3-based antiferroelectric ceramics through delayed phase switching and induced multiphase transitions

“…To gain a deeper insight into the dielectric breakdown process of PCLHT ceramics under electric fields, finite element simulations were conducted using COMSOL software based on SEM observations. 49–53 The simulation results of the electric field, potential distribution, and breakdown path are shown in Fig. 5 and Fig.…”

Achieving high energy density/efficiency in light-metal-element-rich relaxor ferroelectric ceramics by annihilating volatile Schottky defects

“…Research on lightweight energy storage ceramics has gained significant importance with many works being reported. 21–23 NaNbO 3 (NN), which is known for its low theoretical density, has emerged as a promising candidate for lightweight dielectric energy storage, with considerable effort devoted to achieving high energy storage performance (ESP). Zuo et al 24 proposed a strategy of microstructure modification by introducing various polarization configurations and achieved a very high W rec of 8.73 J cm −3 and η of 80.1% in an NN-based relaxor FE ceramic.…”