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<p>Polyetherimide (PEI) polymers serve as crucial dielectric materials for high-temperature capacitive energy storage applications. However, their widespread adoption has been limited by significant performance degradation under elevated temperatures. Here, all-organic pure PEI films are fabricated via a scalable rapid thermal annealing (RTA) process to enhance the energy storage performance. The RTA treatment effectively promotes rapid volatilization of residual solvent with significantly reduced processing time. Remarkably, PEI films annealed at 180&#xa0;°C exhibit outstanding energy storage performance, achieving a discharged energy density (ESD) of 11.34&#xa0;J/cm<sup>3</sup> with an efficiency of 89.63% at room temperature. These films simultaneously demonstrate exceptional breakdown strength (671&#xa0;kV/mm) and maintain a high ESD of 6.03&#xa0;J/cm<sup>3</sup> at 150&#xa0;°C. Furthermore, the optimized films display excellent cyclic stability over 10<sup>6</sup> cycles, sustaining a power density of 0.412&#xa0;MW/cm<sup>3</sup> at 200&#xa0;kV/mm and 150&#xa0;°C. The demonstrated approach presents a practical pathway for developing high-performance polymer dielectrics capable of reliable operation in demanding high-temperature environments.</p>

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Enhanced energy storage properties of pure polyetherimide films via rapid thermal annealing

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Junjie Ou,
  • Haiyan Chen,
  • Guanghu He,
  • Hang Luo,
  • Chuanchang Li

摘要

Polyetherimide (PEI) polymers serve as crucial dielectric materials for high-temperature capacitive energy storage applications. However, their widespread adoption has been limited by significant performance degradation under elevated temperatures. Here, all-organic pure PEI films are fabricated via a scalable rapid thermal annealing (RTA) process to enhance the energy storage performance. The RTA treatment effectively promotes rapid volatilization of residual solvent with significantly reduced processing time. Remarkably, PEI films annealed at 180 °C exhibit outstanding energy storage performance, achieving a discharged energy density (ESD) of 11.34 J/cm3 with an efficiency of 89.63% at room temperature. These films simultaneously demonstrate exceptional breakdown strength (671 kV/mm) and maintain a high ESD of 6.03 J/cm3 at 150 °C. Furthermore, the optimized films display excellent cyclic stability over 106 cycles, sustaining a power density of 0.412 MW/cm3 at 200 kV/mm and 150 °C. The demonstrated approach presents a practical pathway for developing high-performance polymer dielectrics capable of reliable operation in demanding high-temperature environments.