Dielectric capacitors are critical components in electronics and energy storage devices. The polymer based dielectric capacitors have advantages of flexibility, fast charge and discharge, 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 h-BN nanosheets) (PVDF/PMMA-2D fillers/PVDF), that shows enhanced permittivity, high dielectric strength and an ultra-high energy density of 75 J/cm3 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 universal for designing high energy density thin film polymeric dielectric capacitors for myriads of applications.
@article{arxiv.2303.06072,
title = {High Energy Density in layered 2D Nanomaterial based Polymer Dielectric Films},
author = {Maninderjeet Singh and Priyanka Das and Pabitra Narayan Samanta and Sumit Bera and Ruskshan Tanthirige and Brian Shook and Roshanak Nejat and Banarji Behera and Qiqi Zhang and Qilin Dai and Avijit Pramanik and Paresh Ray and Dharmaraj Raghavan and Jerzy Leszczysnki and Alamgir Karim and Nihar R. Pradhan},
journal= {arXiv preprint arXiv:2303.06072},
year = {2024}
}