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首页> 外文期刊>Advanced energy materials >Molecular Trap Engineering Enables Superior High-Temperature Capacitive Energy Storage Performance in All-Organic Composite at 200 ℃
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Molecular Trap Engineering Enables Superior High-Temperature Capacitive Energy Storage Performance in All-Organic Composite at 200 ℃

机译：Molecular Trap Engineering Enables Superior High-Temperature Capacitive Energy Storage Performance in All-Organic Composite at 200 ℃

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摘要

Dielectric capacitors are essential components of advanced high-powerelectrical and electronic systems for electrical energy storage. The drasticreductions in the energy density and the charge-discharge efficiency of dielectricpolymers at elevated temperatures, owing to sharply increased electricalconduction, remain a major challenge. While substantial progress has beenmade in enhancing the high-temperature capacitive performance of dielectricpolymers, the improvement has been rather limited when the temperatureexceeds 150 ℃. Here, a universal approach to the control of the energy levelof charge traps in all-organic polymer composites by substituent engineeringof organic semiconductors, leading to significantly suppressed high-fieldhigh-temperature conduction loss and improved capacitive performance isreported. At 200 ℃, the polymer/organic semiconductor composite deliversultrahigh energy densities of 3.4 and 5.0 J cm~(?3) with an efficiency >90 at10 and 100 Hz, respectively, outperforming the current dielectric polymersand composites. The underlying mechanism of the improved performance isrevealed experimentally and confirmed computationally. Moreover, excellentcyclability and the ability to be fabricated into large-area high-quality filmswith uniform performance, along with an ultralow filler loading, further demonstratethe potential of molecularly engineered organic semiconductors fordielectric polymer composites operating under extreme conditions.

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