High-temperature polymer dielectrics with superior capacitive energy storage performance
CHEMICAL ENGINEERING JOURNAL(2023)
Abstract
Polymer dielectrics for high-temperature capacitive energy storage are extremely desirable in modern electronics and electrical systems. However, pure polymer dielectrics operating above 200 degrees C have yet not been reported. Here, we demonstrate a polymer dielectric polynorbornene-imide (PNI) exhibits excellent energy storage per-formances at 250 degrees C owing to simultaneous large optical bandgap (4.3 eV) and high glass transition temperature (265 degrees C) endowed by the full-carbon backbone and rigid side chain containing benzene ring and the imide group. Significantly, PNI delivers a maximum discharged energy density (Ud) of 6.04 J/cm3 at 200 degrees C and a Ud of 2.57 J/cm3 at 250 degrees C. More importantly, PNI exhibits a Ud above 90% efficiency of 2.8 J/cm3 at 200 degrees C, and 0.74 J/ cm3 at 250 degrees C, outperforming reported all pure polymer dielectrics and polymer composites dielectrics so far. The excellent recycling stability, fast discharge capability and unique self-healing capacity enables it a promising candidate for capacitor films in industry. This work provides a new design strategy for polymer dielectrics under harsh environments.
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Key words
Polymer dielectrics,Bandgap,High-temperature energy storage,Discharged energy density,Charge-discharge efficiency
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