A novel low-loss and high-stability (1-x)Na0.98NbO3–xBi(Al0.5Y0.5)O3 lead-free composite ceramics for dielectric energy storage capacitors
A novel low-loss and high-stability (1-x)Na0.98NbO3–xBi(Al0.5Y0.5)O3 lead-free composite ceramics for dielectric energy storage capacitors
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DOI：
10.1016/j.cej.2023.146426
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发表时间：
2023-11
影响因子：
15.1
通讯作者：
Han Yang;Chen Bin;Yunhong Zhao;X. Hou;Jingtong Zhang;Luocheng Liao;Haomiao Zhou;Yunya Liu;Jieying Wang
中科院分区：
文献类型：
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作者：
Han Yang;Chen Bin;Yunhong Zhao;X. Hou;Jingtong Zhang;Luocheng Liao;Haomiao Zhou;Yunya Liu;Jieying Wang
高效、清洁的储能设备迫切需要环保、高性能、无铅介质陶瓷电容器。然而，大多数铁电电容器需要过高的电场来实现大的能量存储密度。本研究采用传统的固相反应法制备了不同BAY掺杂量的（1-x）Na 0. 98 NbO 3-xBi（Al 0. 5 Y 0. 5）O3（简称（1-x）NN-xBAY）复合体系。在非化学计量比NN中引入12mol%BAY后，0.88NN-0.12BAY陶瓷的极化-电场环明显变细，表现出上级弛豫行为。在223.47 kV/cm的中等电场下，0.88NN-0.12BAY陶瓷的介电损耗（tan δ< 0.005）、储能密度（Δ 4.64 J/cm ~ 3）和效率（Δ 85.98%）均显著降低。此外，它在25-200 °C的温度范围和1-200 Hz的宽频率范围内表现出稳定性，甚至在108次电循环后也是如此。这项研究证明了一种有前途的候选材料，可用于在低或中等电场下工作的储能器件。
Environmentally friendly, high-performance, lead-free dielectric ceramic capacitors are urgently required for efficient and clean energy storage devices. However, most ferroelectric capacitors require excessively high electric fields to achieve large energy storage densities. In this study, we designed and fabricated a (1-x)Na0.98NbO3–xBi(Al0.5Y0.5)O3(abbreviated as (1-x)NN-xBAY) composite system with different BAY doping levels using a traditional solid-state reaction method. By introducing 12 mol% BAY into nonstoichiometric NN, the polarization–electric field loop of the 0.88NN–0.12BAY ceramic became significantly slender and showed a superior relaxor behavior. Consequently, a remarkably low dielectric loss oftanδ< 0.005, high energy storage density of ∼ 4.64 J/cm3, and high efficiency of∼85.98 % were simultaneously obtained in the 0.88NN–0.12BAY ceramic under a moderate electric field of 223.47 kV/cm. Furthermore, it exhibited ultrahigh stability in the temperature range of 25–200 °C and wide frequency range of 1–200 Hz, even after 108electrical cycles. This study demonstrated a promising candidate material for energy storage devices operating under low or medium electric fields.