Yongjing Zhang, Ying Lin, Yanlong Ma, Qibin Yuan and Haibo Yang
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This innovative structure confers the PEI-based composites upon synergistic optimization of polarization intensity, breakdown strength and energy loss by designed interface effectiveness adopting tailored filler and interface configuration as modulation means, which can be further confirmed by finite element simulations and comparative experiments. The resultant composite film achieves an excellent <em>U</em><small><sub>e</sub></small> of 22.95 J cm<small><sup>−3</sup></small> and an ultra-high <em>η</em> of 96.81% at ambient temperature, along with high-temperature performances of 12.88 J cm<small><sup>−3</sup></small> and 79.26% at 150 °C, surpassing all previously reported polymer films in terms of both metrics. 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引用次数: 0
摘要
随着储能技术的不断进步，储能电介质的更新换代迫在眉睫。然而，目前最先进的复合薄膜无法满足储能设备的应用要求，即需要同时具备高放电能量密度（Ue）、高储能效率（η）和优异的高温性能。为了应对这一挑战，我们在基于聚醚酰亚胺（PEI）的掺杂 Na0.5Bi0.5TiO3 陶瓷纤维的非对称多层复合材料中提出了一种由纯 BN 纳米片组成的创新夹层。这种创新结构使 PEI 基复合材料在极化强度、击穿强度和能量损耗方面获得了协同优化，其设计界面的有效性采用了量身定制的填料和界面配置作为调制手段，这可以通过有限元模拟和对比实验得到进一步证实。由此制备的复合薄膜在常温下实现了 22.95 J-cm-3 的优异 Ue 值和 96.81% 的超高 η 值，在 150 °C 时实现了 12.88 J-cm-3 的高温性能和 79.26% 的超高 η 值，在这两项指标上都超过了之前报道的所有聚合物薄膜。这项研究为开发适合实际应用的高性能储能电介质提供了新的见解。
Synergistically enhanced discharged energy density and efficiency achieved in designed polyetherimide-based composites via asymmetrical interlayer structure induced optimized interface effectiveness†
The continuous advancement in energy storage technologies necessitates the iteration of energy storage dielectrics urgently. However, the current state-of-the-art composite films fail to meet the application requirements of energy storage devices, which demand a combination of high discharged energy density (Ue), high energy storage efficiency (η), and excellent high-temperature performance. To address this challenge, we present an innovative interlayer composed of pure BN nanosheets in polyetherimide (PEI)-based asymmetrical multilayered composites doped with Na0.5Bi0.5TiO3 ceramic fibers. This innovative structure confers the PEI-based composites upon synergistic optimization of polarization intensity, breakdown strength and energy loss by designed interface effectiveness adopting tailored filler and interface configuration as modulation means, which can be further confirmed by finite element simulations and comparative experiments. The resultant composite film achieves an excellent Ue of 22.95 J cm−3 and an ultra-high η of 96.81% at ambient temperature, along with high-temperature performances of 12.88 J cm−3 and 79.26% at 150 °C, surpassing all previously reported polymer films in terms of both metrics. This study provides new insights for developing high-performance energy storage dielectrics suitable for practical applications.
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