Ding Jiale, Zhou Yao, Xu Wenhan, Yang Fan, Zhao Danying, Zhang Yunhe, Jiang Zhenhua, Wang Qing
College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA.
Nanomicro Lett. 2023 Dec 20;16(1):59. doi: 10.1007/s40820-023-01230-2.
Polymer dielectrics capable of operating efficiently at high electric fields and elevated temperatures are urgently demanded by next-generation electronics and electrical power systems. While inorganic fillers have been extensively utilized to improved high-temperature capacitive performance of dielectric polymers, the presence of thermodynamically incompatible organic and inorganic components may lead to concern about the long-term stability and also complicate film processing. Herein, zero-dimensional polymer dots with high electron affinity are introduced into photoactive allyl-containing poly(aryl ether sulfone) to form the all-organic polymer composites for high-temperature capacitive energy storage. Upon ultraviolet irradiation, the crosslinked polymer composites with polymer dots are efficient in suppressing electrical conduction at high electric fields and elevated temperatures, which significantly reduces the high-field energy loss of the composites at 200 °C. Accordingly, the ultraviolet-irradiated composite film exhibits a discharged energy density of 4.2 J cm at 200 °C. Along with outstanding cyclic stability of capacitive performance at 200 °C, this work provides a promising class of dielectric materials for robust high-performance all-organic dielectric nanocomposites.
下一代电子和电力系统迫切需要能够在高电场和高温下高效运行的聚合物电介质。虽然无机填料已被广泛用于改善介电聚合物的高温电容性能，但热力学不相容的有机和无机组分的存在可能会引发对长期稳定性的担忧，并且还会使薄膜加工复杂化。在此，将具有高电子亲和力的零维聚合物点引入含光活性烯丙基的聚（芳基醚砜）中，以形成用于高温电容储能的全有机聚合物复合材料。在紫外线照射下，含有聚合物点的交联聚合物复合材料在高电场和高温下能有效抑制导电，这显著降低了复合材料在200°C时的高场能量损失。因此，紫外线辐照复合薄膜在200°C时的放电能量密度为4.2 J/cm³。该工作除了在200°C时具有出色的电容性能循环稳定性外，还为坚固的高性能全有机介电纳米复合材料提供了一类有前景的介电材料。
