Zheng Binglong, Lin Ying, Yang Haibo, Jing Hongmei, Nan Hu, Wang Yifei, Yao Fang-Zhou, Wang Minquan, Yuan Qibin
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China.
School of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710119, China.
Adv Sci (Weinh). 2025 Jan;12(1):e2409814. doi: 10.1002/advs.202409814. Epub 2024 Oct 30.
Crafting high-performance dielectrics tailored for pulsed power capacitors, in response to the escalating demands of practical applications, presents a formidable challenge. Herein, this work introduces a novel lineup of lead-free ceramics with local polymorphic heterogeneous structures, defined by the formula (1-x)[0.92BaTiO-0.08Sr(MgTi)O]-x(NaBi)TiO (BT-SMT-xNBT). This innovative multi-scale synergistic strategy, spanning from the atomic to grain scale, yields materials with a giant recoverable energy density (W) of 10.1 J·cm and an impressive energy efficiency (η) of 95.0%. The integration of linear end elements SMT can significantly mitigate the polarization hysteresis while concurrently boosting the breakdown strength, thus enhancing overall energy efficiency. Furthermore, the inclusion of NBT with high polarization serves to amplify domain size, thereby reinforcing the electric field-induced polarization. This addition also stimulates the creation of polymorphic heterostructures, where tetragonal and rhombohedral nanodomains coexist, as validated by aberration-corrected transmission electron microscopy. Notably, the BT-SMT-0.2NBT ceramics have demonstrated outstanding high-temperature energy storage capabilities, with a W of 7.2 J·cm and an η of 92.2% at 150 °C, along with remarkable broad-temperature stability (ΔW, Δη ≤ 4.0%, ≈20-150 °C). These achievements in this work propel the field toward more practical and durable solutions of energy storage dielectrics.
随着实际应用需求的不断增加，制备适用于脉冲功率电容器的高性能电介质面临着巨大挑战。在此，本工作介绍了一种新型的具有局部多晶型异质结构的无铅陶瓷系列，其化学式为(1-x)[0.92BaTiO₃-0.08Sr(Mg₁/₃Ti₂/₃)O₃]-x(Na₀.₅Bi₀.₅)TiO₃ (BT-SMT-xNBT)。这种从原子尺度到晶粒尺度的创新多尺度协同策略，产生了具有10.1 J·cm⁻³的巨大可恢复能量密度（W）和95.0%的令人印象深刻的能量效率（η）的材料。线性端部元素SMT的引入可以显著减轻极化滞后，同时提高击穿强度，从而提高整体能量效率。此外，包含高极化的NBT有助于扩大畴尺寸，从而增强电场诱导极化。这种添加还刺激了多晶型异质结构的形成，其中四方和菱面体纳米畴共存，这已通过像差校正透射电子显微镜得到验证。值得注意的是，BT-SMT-0.2NBT陶瓷在150°C时表现出出色的高温储能能力，W为7.2 J·cm⁻³，η为92.2%，同时具有显著的宽温度稳定性（ΔW、Δη≤4.0%，≈20 - 150°C）。本工作中的这些成果推动该领域朝着更实用、更耐用的储能电介质解决方案发展。
