Lu Rui, Wang Jian, Duan Tingzhi, Hu Tian-Yi, Hu Guangliang, Liu Yupeng, Fu Weijie, Han Qiuyang, Lu Yiqin, Lu Lu, Cheng Shao-Dong, Dai Yanzhu, Hu Dengwei, Shen Zhonghui, Jia Chun-Lin, Ma Chunrui, Liu Ming
School of Microelectronics, Xi'an Jiaotong University, Xi'an, China.
International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China.
Nat Commun. 2024 Aug 3;15(1):6596. doi: 10.1038/s41467-024-50832-w.
Dielectric capacitors are highly desired for electronic systems owing to their high-power density and ultrafast charge/discharge capability. However, the current dielectric capacitors suffer severely from the thermal instabilities, with sharp deterioration of energy storage performance at elevated temperatures. Here, guided by phase-field simulations, we conceived and fabricated the self-assembled metadielectric nanostructure with HfO as second-phase in BaHfTiO relaxor ferroelectric matrix. The metadielectric structure can not only effectively increase breakdown strength, but also broaden the working temperature to 400 C due to the enhanced relaxation behavior and substantially reduced conduction loss. The energy storage density of the metadielectric film capacitors can achieve to 85 joules per cubic centimeter with energy efficiency exceeding 81% in the temperature range from 25 °C to 400 °C. This work shows the fabrication of capacitors with potential applications in high-temperature electric power systems and provides a strategy for designing advanced electrostatic capacitors through a metadielectric strategy.
介电电容器因其高功率密度和超快充放电能力而在电子系统中备受青睐。然而，目前的介电电容器严重受限于热不稳定性，在高温下储能性能会急剧恶化。在此，在相场模拟的指导下，我们构思并制备了以HfO作为BaHfTiO弛豫铁电基体中的第二相的自组装超介电纳米结构。这种超介电结构不仅能有效提高击穿强度，还能因增强的弛豫行为和大幅降低的传导损耗将工作温度拓宽至400℃。在25℃至400℃的温度范围内，超介电薄膜电容器的储能密度可达每立方厘米85焦耳，能量效率超过81%。这项工作展示了具有在高温电力系统中潜在应用的电容器的制备，并通过超介电策略为设计先进的静电电容器提供了一种策略。
