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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Spatial electron localization for enhanced capacitive energy storage in crosslinked polyimide dielectrics
Min Zhong1, Hang Luo1, Guanghu He1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan Province, 410083, China. hangluo@csu.edu.cn.
Abstract:
Polymer dielectrics with enhanced thermal stability and energy density are urgently demanded for capacitive energy storage applications in harsh environments. However, existing heat-resistant polymers, such as Kapton, always suffer from a rapid decrease in energy density at elevated temperatures. Here, a spatial electron localization strategy by building a new crosslinking structure is proposed for semi-aromatic polyimide dielectrics to reduce the free space for the motion and acceleration of electrons and thus enhance charge trapping. Due to the reinforced heat resistance and mechanical properties coupled with suppressed conduction loss at high temperatures and high electric fields, the target dielectric achieves enhanced capacitive energy storage. Consequently, it delivers excellent discharged energy densities of 7.59 J cm-3 at 150 °C and 6.97 J cm-3 at 200 °C while maintaining a charge-discharge efficiency above 90%, achieving an increase of 68.7% and 121.3% than that of the original polyimide dielectric, respectively. This work provides a promising approach for developing next-generation high-performance polymer film capacitors operating under extreme conditions.
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