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Polyimides Physically Crosslinked by Aromatic Molecules Exhibit Ultrahigh Energy Density at 200 °C
Advanced Materials ( IF 27.4 ) Pub Date : 2023-05-17 , DOI: 10.1002/adma.202302392
Minzheng Yang 1 , Le Zhou 1 , Xin Li 1 , Weibin Ren 1 , Yang Shen 1
Affiliation  

Polymer dielectrics possess significant advantages in electrostatic energy storage applications, such as high breakdown strength (Eb) and efficiency (η), while their discharged energy density (Ud) at high temperature is limited by the decrease in Eb and η. Several strategies including introducing inorganic components and crosslinking have been investigated to improve the Ud of polymer dielectrics, but new issues will be encountered, e.g., the sacrifice of flexibility, the degradation of the interfacial insulating property and the complex preparation process. In this work, 3D rigid aromatic molecules are introduced into aromatic polyimides to form physical crosslinking networks through electrostatic interactions between their oppositely charged phenyl groups. The dense physical crosslinking networks strengthen the polyimides to boost the Eb, and the aromatic molecules trap the charge carriers to suppress the loss, allowing the strategy to combine the advantages of inorganic incorporation and crosslinking. This study demonstrates that this strategy is well applicable to a number of representative aromatic polyimides, and ultrahigh Ud of 8.05 J cm−3 (150 °C) and 5.12 J cm−3 (200 °C) is achieved. Furthermore, the all-organic composites exhibit stable performances during ultralong 105 charge–discharge cycles in harsh environments (500 MV m−1 and 200 °C) and prospects for large-scale preparation.

中文翻译:

通过芳香族分子物理交联的聚酰亚胺在 200 °C 下表现出超高能量密度

聚合物电介质在静电储能应用中具有显着的优势,例如高击穿强度(Eb 效率(η),而其在高温下的放电能量密度(Ud )受到Ebη降低的限制。人们已经研究了包括引入无机组分和交联在内的几种策略来提高聚合物电介质的U d,但会遇到新的问题,例如柔韧性的牺牲、界面绝缘性能的退化以及复杂的制备过程。在这项工作中,3D刚性芳香族分子被引入芳香族聚酰亚胺中,通过带相反电荷的苯基之间的静电相互作用形成物理交联网络。致密的物理交联网络增强了聚酰亚胺以提高E b,芳香族分子捕获载流子以抑制损失,使该策略结合了无机掺入和交联的优点。这项研究表明,该策略很好地适用于许多代表性的芳香族聚酰亚胺,并实现了8.05 J cm -3 (150 °C)和5.12 J cm -3 (200 °C)的超高U d 。此外,全有机复合材料在恶劣环境(500 MV m -1和200 °C)下的超长10 5 次充放电循环中表现出稳定的性能,并具有大规模制备的前景。
更新日期:2023-05-17
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