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<p>Conventional polymer film capacitors suffer from significant performance degradation at high temperatures due to increased conductivity loss. This study aims to enhance the high-temperature energy storage performance of polyetherimide (PEI) films by constructing a PZT/SiO<sub>2</sub> heterojunction composite dielectric structure. PEI films were prepared by solution casting and then modified by magnetron sputtering to deposit PZT and SiO<sub>2</sub> layers. At 150&#xa0;°C, the composite films exhibited a high breakdown strength of 636.7 MV/m, a discharged energy density of 4.28&#xa0;J/cm<sup>3</sup>, and a charge–discharge efficiency exceeding 90%. The PZT/SiO<sub>2</sub> heterojunction effectively inhibited charge injection, reducing leakage current and improving cyclic stability with minimal degradation after 50000 charge–discharge cycles. This scalable method offers a promising approach for developing high-performance polymer-based energy storage materials suitable for high-temperature applications.</p>

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Enhanced high-temperature energy storage in polyetherimide dielectric films via coating PZT/SiO2 heterostructural barrier layers

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Gang Liu,
  • Zining Pu,
  • Limeng Xu,
  • Cheng Yao,
  • Changhai Zhang,
  • Tiandong Zhang,
  • Qingguo Chi

摘要

Conventional polymer film capacitors suffer from significant performance degradation at high temperatures due to increased conductivity loss. This study aims to enhance the high-temperature energy storage performance of polyetherimide (PEI) films by constructing a PZT/SiO2 heterojunction composite dielectric structure. PEI films were prepared by solution casting and then modified by magnetron sputtering to deposit PZT and SiO2 layers. At 150 °C, the composite films exhibited a high breakdown strength of 636.7 MV/m, a discharged energy density of 4.28 J/cm3, and a charge–discharge efficiency exceeding 90%. The PZT/SiO2 heterojunction effectively inhibited charge injection, reducing leakage current and improving cyclic stability with minimal degradation after 50000 charge–discharge cycles. This scalable method offers a promising approach for developing high-performance polymer-based energy storage materials suitable for high-temperature applications.