聚醚酰亚胺
材料科学
电介质
电容器
聚合物
介电强度
聚对苯撑
电容
复合材料
储能
介电损耗
高-κ电介质
光电子学
电气工程
电压
工程类
化学
功率(物理)
物理化学
物理
量子力学
电极
作者
Yan Jing,Huan Wang,Junyang Zeng,Xin Zhang,Nan Chen,Shujun Zhang
出处
期刊:Small
[Wiley]
日期:2023-06-20
卷期号:19 (42)
被引量:3
标识
DOI:10.1002/smll.202304310
摘要
Dielectric energy storage polymers play a vital role in advanced electronics and electrical systems, due to their high breakdown strength, excellent reliability, and easy fabrication. However, the low dielectric constant and poor thermal resistance of dielectric polymers limit their energy storage density and working temperatures, making them less versatile for broader applications. In this work, a novel carboxylated poly (p-phenylene terephthalamide) (c-PPTA) is synthesized and employed to simultaneously enhance the dielectric constant and thermal resistance of polyetherimide (PEI), leading to a discharged energy density of 6.4 J cm-3 at 150 °C. The introduction of c-PPTA molecules effectively reduces the ΠΠ stacking effect and increases the average chain spacing between polymer molecules, which is conducive to improving the dielectric constant. Additionally, c-PPTA molecules with stronger positive charges and high dipole moments can capture electrons, resulting in reduced conduction loss and enhanced breakdown strength at high temperatures. The coiled capacitor fabricated with the PEI/c-PPTA film exhibits superior capacitance performances and higher working temperatures compared to commercial metalized PP capacitors, demonstrating great potential for dielectric polymers in high-temperature electronic and electrical energy storage systems.
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