Intrinsic-designed polyimide dielectric materials with large energy storage density and discharge efficiency at harsh ultra-high temperatures

Yaya Tian; Ming-Sheng Zheng; Yuchao Li; Chuqi Xu; Yiyi Zhang; Wei Liu; Zhi-Min Dang; Jun-Wei Zha

doi:10.1039/d3mh01267k

Intrinsic-designed polyimide dielectric materials with large energy storage density and discharge efficiency at harsh ultra-high temperatures

Mater Horiz. 2023 Nov 27;10(12):5835-5846. doi: 10.1039/d3mh01267k.

Authors

Yaya Tian¹, Ming-Sheng Zheng¹, Yuchao Li², Chuqi Xu³, Yiyi Zhang³, Wei Liu⁴, Zhi-Min Dang⁵, Jun-Wei Zha¹

Affiliations

¹ Beijing Advanced Innovation Center for Materials Genome Engineering, School of Chemistry and Biological Engineering, University of Science & Technology Beijing, Beijing 100083, P. R. China. zhajw@ustb.edu.cn.
² School of Materials Science and Engineering, Liaocheng University, Liaocheng, 252059, P. R. China. liyuchao@lcu.edu.cn.
³ School of Electrical Engineering, Guangxi University, Nanning 530004, P. R. China.
⁴ School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China.
⁵ State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing 100084, P. R. China.

PMID: 37843469
DOI: 10.1039/d3mh01267k

Abstract

Polymer dielectric materials with excellent temperature stability are urgently needed for the ever-increasing energy storage requirements under harsh high-temperature conditions. In this work, a novel diamine monomer (bis(2-cyano-4-aminophenyl)amine) was successfully synthesized to prepare a series of cyano-containing polyimides (CPI-1-3), which possessed excellent dielectric properties and high thermostability. The maximum dielectric permittivity was up to 5.5 at 10² Hz for CPI-3, being 2.5 times higher than that of commercially used BOPP. In comparison, the CPI-1 exhibited an outstanding breakdown strength of 433 MV m^-1 and a high energy density of 2.5 J cm^-3 even at 250 °C, which was the highest value reported under the same conditions. The synthesized CPIs through such an intrinsic approach are potential candidate materials for energy storage and even other applications under simultaneously harsh electrical and thermal conditions.