Li He, Ai Ding, Ren Lulu, Yao Bin, Han Zhubing, Shen Zhonghui, Wang Jianjun, Chen Long-Qing, Wang Qing
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
Adv Mater. 2019 Jun;31(23):e1900875. doi: 10.1002/adma.201900875. Epub 2019 Apr 12.
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 Al O 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 Al O nanoplates display a record capacitive performance, e.g., a discharged energy density of 3.31 J cm and a charge-discharge efficiency of >90% measured at 450 MV m and 150 °C, significantly outperforming the state-of-the-art dielectric polymers and nanocomposites that are typically prepared via tedious, low-yield approaches.
下一代微电子和电力系统需要能够在高温下高效运行的高能量密度介电聚合物材料。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。在此，报道了由易于制备的具有系统变化形态（包括纳米颗粒、纳米线和纳米板）的Al O填料组成的溶液可加工聚合物纳米复合材料。研究了聚合物纳米复合材料在高温下与电场相关的导电性能。实验揭示了聚合物复合材料的导电行为和击穿强度对填料形态的强烈依赖性，并通过计算进一步进行了合理分析。含有Al O纳米板的聚合物复合材料表现出创纪录的电容性能，例如，在450 MV/m和150°C下测得的放电能量密度为3.31 J/cm³，充放电效率>90%，显著优于通常通过繁琐、低产率方法制备的现有介电聚合物和纳米复合材料。
