Investigation on the dielectric performance of PVDF-HFP/LZO composites
Investigation on the dielectric performance of PVDF-HFP/LZO composites
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DOI：
10.1016/j.jallcom.2020.155889
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发表时间：
2020-11-30
影响因子：
6.2
通讯作者：
Kalathi, Jagannathan T.
中科院分区：
文献类型：
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作者：
Kumar, Kishor M. J.;Kalathi, Jagannathan T.
薄膜电容器的储能密度对于光电器件至关重要。在各种电介质中，聚偏氟乙烯-六氟丙烯（PVDF-HFP）共聚物由于其固有的高介电常数和击穿强度而被广泛优选。然而，PVDF-HFP 的低储能密度和高介电损耗（tanδ）在目前情况下仍然具有挑战性。在这项工作中，我们演示了如何通过在低温下配制PVDF-HFP/氧化锆（LZO）复合油墨来提高具有低介电损耗的PVDF-HFP的介电常数和能量密度。我们对由 PVDF-HFP/LZO 作为介电层组成的薄膜电容器进行了计算建模，以找到实现高能量密度的最佳 LZO 含量。使用具有不同 LZO 含量的 PVDF-HFP/LZO 复合材料建立了薄膜电容器和介电屏蔽的计算模型，以了解其对电场分布、极化和能量存储密度的影响。我们将模拟预测的 PVDF-HFP/LZO 薄膜电容器的介电性能与阻抗分析测量的实验值进行了比较。 PVDF-HFP 中的最佳 LZO 含量确定为 15 vol%，以在 545 MV/m 击穿强度和低介电损耗下实现 15.8 J/cm(3) 的高储能密度。通过保持较低的介电损耗，PVDF-HFP/LZO15 复合薄膜的介电常数和储能密度比纯 PVDF-HFP 几乎增加了一倍。 (C) 2020 Elsevier B.V. 保留所有权利。
The energy storage density of the film capacitor is crucial for optoelectronic devices. Among various dielectrics, polyvinylidene-fluoride-co-hexafluoropropylene (PVDF-HFP) copolymer is widely preferred due to its inherent high dielectric constant and breakdown strength. However, the low energy storage density and high dielectric loss (tan delta) of PVDF-HFP remains challenging in the present scenario. In this work, we demonstrated how to improve the dielectric constant and energy density of PVDF-HFP with low dielectric losses by formulating PVDF-HFP/Lanthanum Zirconium Oxide (LZO) composite ink at low temperature. We performed the computational modeling of the thin-film capacitor, consisting of PVDF-HFP/LZO as a dielectric layer, to find the optimum LZO content for achieving a high energy density. A computational model of the film capacitor and dielectric shielding was built with PVDF-HFP/LZO composites having a different LZO content to understand its effect on the electric field distribution, polarization, and energy storage density. We compared the dielectric properties of the PVDF-HFP/LZO thin-film capacitor predicted by simulations with the experimental values measured by impedance analysis. The optimum LZO content in PVDF-HFP was determined as 15 vol% to achieve a high energy storage density of 15.8 J/cm(3) at 545 MV/m breakdown strength with low dielectric losses. Dielectric constant and energy storage density of the PVDF-HFP/LZO15 composite film were nearly doubled compared to that of neat PVDF-HFP by keeping dielectric losses low. (C) 2020 Elsevier B.V. All rights reserved.