Superb Energy Storage Capability for NaNbO₃‐Based Ceramics Featuring Labyrinthine Submicro‐Domains with Clustered Lattice Distortions

Abstract

Designing superb dielectric capacitors is valuable but challenging since achieving simultaneously large energy‐storage (ES) density and high efficiency is difficult. Herein, the synergistic effect of grain refining, bandgap widening, and domain engineering is proposed to boost comprehensive ES properties by incorporating CaTiO3 into 0.92NaNbO3‐0.08BiNi0.67Ta0.33O3 matrix (as abbreviated NN‐BNT‐xCT). Apart from grain refining and bandgap widening, multiple local distortions embedded in labyrinthine submicro‐domains, as indicated by diffraction‐freckle splitting and ½‐type superlattices, produce slush‐like polar clusters for the NN‐BNT‐0.2CT ceramic, which should be ascribed to the coexisting P4bm, P21ma, and Pnma2 phases. Consequently, a high recoverable ES density Wrec of ≈ 7.1 J cm−3 and a high efficiency η of ≈ 90% at 646 kV cm−1 is achieved for the NN‐BNT‐0.2CT ceramic. Such hierarchically polar structure is favorable to superb comprehensive ES properties, which provide a strategy for developing high‐performance dielectric capacitors.

Excellent Energy Storage Performance Achieved in Sr(Sc0.5Nb0.5)O3-Doped Bi0.5Na0.5TiO3-Based Lead-Free Relaxor Ferroelectric Ceramics

“…(f) Comparing values of W rec and η between ceramics x = 0, 0.20, and 0.20 (RRP). (g) Comparison of ESP parameters between this work and other lead-free ceramics. ,,,,,,,,,,,− ,− (h) Temperature-dependent (25–160 °C) and (i) frequency-dependent (1–100 Hz) P–E loops for x = 0.20 (RRP) ceramic.…”

Ultrahigh Energy Storage in Tungsten Bronze Dielectric Ceramics Through a Weakly Coupled Relaxor Design

“…It should be stressed that the energy storage performance of the S2 sample is highly comparable to that of perovskite-structured dielectric ceramics documented in the literature. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] In Figure 1d, a comparison is made between the energy-storage performance of sample S2 with other TTBs ceramics. It is evident that sample S2, developed in the scope of this study, has the highest recoverable energy density W rec among all TTBs ceramics, [6,7,[13][14][15][31][32][33][34][35][36][37][38][39][40][41] reaching to a remarkable 9 J cm −3 .…”

“…It can be seen that with the increase of the electric field, energy storage density gradually increases and efficiency gradually decreases. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] and d) W rec versus 𝜂 with other TTBs ceramics reported previously. [6,7,[13][14][15][31][32][33][34][35][36][37][38][39][40][41] e) Under-damped discharge waveforms of the S2 sample as a function of time, the inset shows the current density (C D ) and power discharge density (P D ) as a function of applied electric fields.…”

“…b) calculated W rec and 𝜂 under E b from unipolar hysteresis loops. c) Comparison of the W rec versus 𝜂 of ceramic S2 with other representative lead-free ceramics reported previously[17][18][19][20][21][22][23][24][25][26][27][28][29][30] and d) W rec versus 𝜂 with other TTBs ceramics reported previously [6,7,[13][14][15][31][32][33][34][35][36][37][38][39][40][41]. e) Under-damped discharge waveforms of the S2 sample as a function of time, the inset shows the current density (C D ) and power discharge density (P D ) as a function of applied electric fields.…”

Innovative Design of BNKT-xSLZT Ceramics: Maximizing the Polarization Difference for Enhanced Energy Storage

“…To further evaluate the influence of ceramic microstructures on breakdown strength, COMSOL simulations were conducted 34. The nominal E field of the ceramics (Figure3f) demonstrates improvement with higher SLZT content, reflecting the higher E b of the ceramic as x increases 55. The breakdown paths of BNKT-xSLZT ceramics are depicted in Figure3g−3j, illustrating their electric tree process over time.…”