Zhang Shaoyan, Xie Bing, Cai Jinxia, Wu Shixian, Xu Haishan, Guo Kun, Mao Pu, Zhang Haibo
School of Power and Energy, Jiangxi Key Laboratory of Green General Aviation Power, Nanchang Hangkong University, Nanchang 330063, China.
School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China.
Nanoscale. 2025 Jul 10;17(27):16447-16456. doi: 10.1039/d5nr01685a.
Polymer dielectrics with superior high-temperature capacitive energy storage capabilities have become increasingly crucial for modern power systems and high-voltage electrical devices. Current polymer dielectrics, however, suffer from high conduction losses when exposed to high temperatures and electric fields, which significantly impede their ability to achieve high discharge energy density () and efficiency (). Herein, fluorene polyester (FPE) nanocomposites incorporating ultra-low content AlO nanoplates (NPLs) are presented. At 150 °C, the FPE-based nanocomposites with 1 wt% AlO NPLs exhibit a remarkable of 4.96 J cm and an of 81% at 520 MV m, outperforming most polymer dielectrics. The improvement in is attributed to three key factors: (I) the introduction of a wide bandgap of AlO NPLs enables them to bear high local electric fields and delay the formation of breakdown pathways, leading to an enhanced breakdown strength () of 520 MV m; (II) a minimal loading of AlO NPLs as a deep trap can effectively capture free charges and inhibit the migration of charge carriers in the polymers, thus reducing conductive losses and remnant polarization (); and (III) the small-size and ultra-low content of AlO NPLs can create a high specific surface area that facilitates high Maxwell-Wagner-Sillars interfacial polarization, leading to increased maximum polarization (). The enhanced and the increased polarization difference (Δ = - ) together contribute to the substantial improvements in both and .
具有卓越高温电容储能能力的聚合物电介质对于现代电力系统和高压电气设备变得越来越重要。然而，目前的聚合物电介质在高温和电场作用下会遭受高传导损耗，这严重阻碍了它们实现高放电能量密度（）和效率（）的能力。在此，我们展示了一种包含超低含量AlO纳米片（NPLs）的芴聚酯（FPE）纳米复合材料。在150°C时，含有1 wt% AlO NPLs的基于FPE的纳米复合材料在520 MV m下表现出显著的4.96 J cm的 和81%的 ，优于大多数聚合物电介质。 的提高归因于三个关键因素：（I）AlO NPLs宽带隙的引入使其能够承受高局部电场并延迟击穿路径的形成，导致击穿强度（）提高到520 MV m；（II）作为深陷阱的AlO NPLs的最小负载量可以有效捕获自由电荷并抑制聚合物中电荷载流子的迁移，从而降低传导损耗和残余极化（）；（III）AlO NPLs的小尺寸和超低含量可以创造高比表面积，促进高麦克斯韦 - 瓦格纳 - 西拉斯界面极化，导致最大极化（）增加。增强的 和增加的极化差（Δ = - ）共同促成了 和 的大幅提高。
