Scalable Polymer Nanocomposites with Record High-Temperature Capacitive Performance Enabled by Rationally Designed Nanostructured Inorganic Fillers
Scalable Polymer Nanocomposites with Record High-Temperature Capacitive Performance Enabled by Rationally Designed Nanostructured Inorganic Fillers
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DOI：
10.1002/adma.201900875
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发表时间：
2019-06-01
影响因子：
29.4
通讯作者：
Wang, Qing
中科院分区：
文献类型：
--
作者：
Li, He;Ai, Ding;Wang, Qing
下一代微电子和电力系统需要高能量密度的介电聚合物材料，这种材料可以在高温下有效地工作。然而，目前可用的聚合物电介质仅限于相对较低的工作温度。本文报道了由易于制备的Al2O3填料组成的溶液可加工聚合物纳米复合材料，这些填料具有系统的不同形态，包括纳米颗粒、纳米线和纳米板。研究了聚合物纳米复合材料在高温下的场依赖性电导率。实验揭示了聚合物复合材料的导电行为和击穿强度与填料形态的密切关系，并通过计算进一步证明了这一点。含有Al2O3纳米板的聚合物复合材料显示出创纪录的电容性能，例如，在450 MV m（-1）和150℃下测量的放电能量密度为3.31 J cm(-3)，充放电效率为bbb90 %，显著优于通常通过繁琐，低产量方法制备的最先进的介电聚合物和纳米复合材料。
Next-generation microelectronics and electrical power systems call for high-energy-density dielectric polymeric materials that can operate efficiently under elevated temperatures. However, the currently available polymer dielectrics are limited to relatively low working temperatures. Here, the solution-processable polymer nanocomposites consisting of readily prepared Al2O3 fillers with systematically varied morphologies including nanoparticles, nanowires, and nanoplates are reported. The field-dependent electrical conduction of the polymer nanocomposites at elevated temperatures is investigated. A strong dependence of the conduction behavior and breakdown strength of the polymer composites on the filler morphology is revealed experimentally and is further rationalized via computations. The polymer composites containing Al2O3 nanoplates display a record capacitive performance, e.g., a discharged energy density of 3.31 J cm(-3) and a charge-discharge efficiency of >90% measured at 450 MV m(-1) and 150 degrees C, significantly outperforming the state-of-the-art dielectric polymers and nanocomposites that are typically prepared via tedious, low-yield approaches.