Polyimide, endowed with high thermal resistance due to its aromatic structure, is considered a potential candidate for high-temperature polymer dielectrics. However, the strong electron delocalization in the aromatic structure causes significant leakage current during high-temperature electron transport, impairing energy storage performance. This contradictory relationship presents a bottleneck in enhancing the high-temperature energy storage performance of PI. In this work, inspired by fish migration influenced by vortices, we propose inducing electron displacement through fluorine-modified aromatic structures, constructing an internal electric field in PI to affect electron transport. This approach cleverly resolves the conflict between thermal resistance and current loss caused by the aromatic main chain in PI, achieving a synergistic enhancement of thermal resistance and high-temperature energy storage performance. Experimental results show significant improvements in both the high heat-resistant quality and high-temperature energy storage performance of PI. The glass transition temperature increased from 257.32 °C to 264.07 °C, and the leakage current density decreased from 7.1 × 10^-7 A/cm² to 2.8 × 10^-8 A/cm². Simultaneously, with a charge-discharge efficiency of approximately 90%, the discharge energy density increased from 0.36 J/cm³ to 5.22 J/cm³, an improvement of 1345.98%. This strategy validates the potential of aromatic structures as the main chain for high-temperature energy storage polymers.

中文翻译：

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通过基于芳香族结构的电子诱导效应在聚酰亚胺中实现出色的高温电容储能


聚酰亚胺由于其芳香族结构而具有高耐热性，被认为是高温聚合物电介质的潜在候选者。然而，芳烃结构中的强电子离域在高温电子传输过程中会导致明显的泄漏电流，从而损害储能性能。这种矛盾的关系为增强 PI 的高温储能性能带来了瓶颈。在这项工作中，受受涡流影响的鱼类迁移的启发，我们提出通过氟修饰的芳香族结构诱导电子位移，在 PI 中构建内部电场以影响电子传输。这种方法巧妙地解决了 PI 中芳香族主链引起的热阻和电流损耗之间的冲突，实现了热阻和高温储能性能的协同增强。实验结果表明，PI 的高耐热质量和高温储能性能都有了显著提高。玻璃化转变温度从 257.32 °C 增加到 264.07 °C，泄漏电流密度从 7.1 × 10 ^-7 A/cm ² 降低到 2.8 × 10 ^-8 A/cm²。同时，在充放电效率约为 90% 的情况下，放电能量密度从 0.36 J/cm ³ 增加到 5.22 J/cm ³ ，提高了 1345.98%。该策略验证了芳香族结构作为高温储能聚合物主链的潜力。