Ultrahigh energy storage density in lead-free Bi0.5Na0.5TiO3-based relaxor ferroelectric ceramics under moderate electric fields via phase fraction manipulation†

IF 6.1 1区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Frontiers Pub Date : 2024-12-20 DOI:10.1039/D4QI02642J

Jiangtao Fan, Linxiang Wang, Jiaxing Wang, Zheng Cheng, Langxiang Zhong, Tiantian Yang and Zhanggui Hu

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Abstract

Since electronic devices deteriorate when used in extremely high electric fields, it is essential to explore the potential of dielectric capacitors with high energy density under medium electric fields (MEFs). In this study, a polymorphic multiscale domain construction strategy was proposed to optimize the energy storage performance (ESP) of (1−x)Bi_0.5Na_0.5TiO₃-xCa(Ta_0.5Al_0.5)O₃ (xCTA, x = 0, 0.05, 0.1, 0.15, 0.2) under MEFs. The symbiosis of rhombic (R) + tetragonal (T) phase polar nanoregions (PNRs) was achieved through the design of Ca²⁺ and (Ta⁵⁺ + Al³⁺)⁴⁺ doping to phase ratios. This resulted in a significant recoverable energy density (W_rec) of 5.89 J cm⁻³ and an efficiency (η) of 87.4% at 370 kV cm⁻¹ for the 0.15CTA ceramic. In addition, the 0.15CTA ceramic exhibited excellent ESP stability (30 °C–200 °C and 1–200 Hz) and achieved ultra-high power density (P_d = 154 MW cm⁻³) and a fast discharge time (t_0.9 = 54.07 ns). This work presents a promising approach to boost the ESP of ceramic capacitors under MEFs.

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中等电场条件下控制相分数制备无铅bi0.5 na0.5 tio3基弛豫铁电陶瓷的超高储能密度

由于电子设备在极高电场中使用时性能会下降，因此有必要探索在中等电场（MEF）下具有高能量密度的电介质电容器的潜力。本文提出了一种多态多尺度畴构建策略，以优化 (1-x)Bi0.5Na0.5TiO3-xCa(Ta0.5Al0.5)O3(xCTA, x=0, 0.05, 0.1, 0.15, 0.2) 在中电场下的储能性能（ESP）。通过设计 Ca2+ 和（Ta5+ + Al3+）4+ 的掺杂比例，实现了菱形（R）+ 四方（T）相极性纳米区域（PNR）的共生。这使得 0.15CTA 陶瓷在 370 kV cm-1 时的可回收能量密度 (Wrec) 达到 5.89 J cm-3，效率 () 达到 87.4%。此外，0.15CTA 陶瓷还具有出色的静电除尘器稳定性（30 ~ 200°C 和 1-200 Hz），并实现了超高功率密度（154 MW cm-3）和快速放电时间（54.07 ns）。这项工作为提高陶瓷电容器在 MEF 中的静电除尘器性能提供了一种可行的方法。

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