Singh Maninderjeet, Das Priyanka, Samanta Pabitra Narayan, Bera Sumit, Thantirige Rukshan, Shook Brian, Nejat Roushanak, Behera Banarji, Zhang Qiqi, Dai Qilin, Pramanik Avijit, Ray Paresh, Raghavan Dharmaraj, Leszczynski Jerzy, Karim Alamgir, Pradhan Nihar R
Department of Chemical & Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States.
Department of Chemistry, Physics & Atmospheric Sciences, Jackson State University, Jackson, Mississippi 39217, United States.
ACS Nano. 2023 Oct 24;17(20):20262-20272. doi: 10.1021/acsnano.3c06249. Epub 2023 Oct 13.
Dielectric capacitors are critical components in electronics and energy storage devices. The polymer-based dielectric capacitors have the advantages of device flexibility, fast charge-discharge rates, low loss, and graceful failure. Elevating the use of polymeric dielectric capacitors for advanced energy applications such as electric vehicles (EVs), however, requires significant enhancement of their energy densities. Here, we report a polymer thin film heterostructure-based capacitor of poly(vinylidene fluoride)/poly(methyl methacrylate) with stratified 2D nanofillers (Mica or -BN nanosheets) (PVDF/PMMA-2D fillers/PVDF), that shows enhanced permittivity, high dielectric strength, and an ultrahigh energy density of ≈75 J/cm with efficiency over 79%. Density functional theory calculations verify the observed permittivity enhancement. This approach of using oriented 2D nanofillers-based polymer heterostructure composites is expected to be versatile for designing high energy density thin film polymeric dielectric capacitors for myriads of applications.
介电电容器是电子和能量存储设备中的关键组件。基于聚合物的介电电容器具有器件柔韧性、快速充放电速率、低损耗和失效模式良好等优点。然而，要提高聚合物介电电容器在诸如电动汽车（EV）等先进能源应用中的使用，需要显著提高其能量密度。在此，我们报道了一种基于聚偏氟乙烯/聚甲基丙烯酸甲酯的聚合物薄膜异质结构电容器，其具有分层的二维纳米填料（云母或六方氮化硼纳米片）（PVDF/PMMA-二维填料/PVDF），该电容器表现出增强的介电常数、高介电强度以及约75 J/cm³的超高能量密度，效率超过79%。密度泛函理论计算验证了所观察到的介电常数增强。这种使用基于取向二维纳米填料的聚合物异质结构复合材料的方法有望广泛应用于设计用于众多应用的高能量密度薄膜聚合物介电电容器。
