Tailoring Poly(Styrene‐co‐maleic anhydride) Networks for All‐Polymer Dielectrics Exhibiting Ultrahigh Energy Density and Charge–Discharge Efficiency at Elevated Temperatures. Issue 1 (18th November 2022)

• Record Type: Journal Article
• Authors: Pan, Zizhao; Li, Li; Wang, Lina; Luo, Guangfu; Xu, Xinwei; Jin, Fei; Dong, Jiufeng; Niu, Yujuan; Sun, Liang; Guo, Chuanfei; Zhang, Wenqing; Wang, Qing; Wang, Hong
• Is Part Of: Advanced materials. Volume 35:Issue 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-18
• Subjects: crosslinking -- efficiency -- energy density -- high‐temperature polymer dielectrics -- molecular traps; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202207580
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Polymer film capacitors have been widely used in electronics and electrical power systems due to their advantages of high power densities, fast charge–discharge speed, and great stability. However, the exponential increase of electrical conduction with temperature and applied electric field substantially degrades the capacitive performance of dielectric polymers at elevated temperatures. Here, the first example of controlling the energy level of charge traps in all‐organic crosslinked polymers by tailoring molecular structures that significantly inhibit high‐field high‐temperature conduction loss, which largely differs from current approaches based on the introduction of inorganic fillers, is reported. The polymer network with optimized crosslinking structures exhibits an ultrahigh discharged energy density of 7.02 J cm −3 with charge/discharge efficiencies of >90% at 150 °C, far outperforming current dielectric polymers and composites. The charge‐trapping effects in different crosslinked structures, as the origins of the marked improvements in the high‐temperature capacitive performance, are comprehensively investigated experimentally and confirmed computationally. Moreover, excellent cyclability and self‐healing features are demonstrated in the polymer film capacitors. This work offers a promising pathway of molecular structure design to scalable high‐energy‐density polymer dielectrics capable of operating under harsh environments. Abstract : Ultrahigh discharged energy densities at elevated temperatures are achieved in all‐organic crosslinked polymer dielectrics by tailoring polymer networks at the molecular level. This work provides new insights into the polymer structures that control electrical conduction at high‐temperatures and high‐fields, which will propel the development of scalable capacitive dielectrics for harsh‐environment applications.