hBN/PVDFHFP and BNNS/PVDFHFP nanocomposites as flexible and lightweight dielectric capacitors: High energy storage performance via electrically insulating nanoparticles

Author:

Koroglu Levent12ORCID,Tubio Carmen R.2ORCID,Correia Daniela M.3,Costa Carlos M.45,Ayas Erhan1,Lanceros‐Mendez Senentxu246,Ay Nuran1

Affiliation:

1. Department of Materials Science and Engineering Eskisehir Technical University Eskisehir Türkiye

2. BCMaterials, Basque Center for Materials Applications and Nanostructures UPV/EHU Science Park Leioa Spain

3. Center of Chemistry University of Minho Braga Portugal

4. Physics Centre of Minho and Porto Universities (CF‐UM‐UP) and Laboratory of Physics for Materials and Emergent Technologies (LapMET) University of Minho Braga Portugal

5. Institute of Science and Innovation for Bio‐Sustainability (IB‐S) University of Minho Braga Portugal

6. IKERBASQUE, Basque Foundation for Science Bilbao Spain

Abstract

AbstractAs the energy demand continuously increases, polymer‐based materials have attracted much attention for energy storage systems as dielectric capacitors due to their higher power density and charge–discharge rate than lithium‐ion batteries and supercapacitors. However, it is necessary to increase the energy density of dielectric capacitors. In this context, poly(vinylidene fluoride‐co‐hexafluoropropylene), PVDF‐HFP, matrix nanocomposites are produced by solution casting method reinforced with hexagonal boron nitride (hBN) nanoparticles and silane‐modified boron nitride nanosheets ‐BNNSs‐ (BNNS‐VTS) up to 10 wt.% filler content. The effects of filler content and surface modification of hBN/BNNSs on PVDF‐HFP matrix nanocomposites' microstructure, phase evolution, crystalization behavior, dielectric properties, and energy storage performance are discussed. 4% hBN/PVDF‐HFP nanocomposite demonstrates 641 MV·m−1 of breakdown strength and 23.2 J·cm−3 of discharged energy density due to hexagonal boron nitride's excellent electrical insulating behavior. The achieved values are 3.0 and 10.5 times superior to the values of the neat thin film, respectively, and they are noteworthy among hBN‐ or BNNS‐reinforced PVDF‐based nanocomposites, even in multi‐layered structures. Furthermore, 4% hBN/PVDF‐HFP presents a giant charge–discharge energy efficiency (92%). It is thus demonstrated that hBN/PVDF‐HFP nanocomposites hold a great potential to be used in energy storage applications as flexible and lightweight dielectric capacitors.Highlights PVDF‐HFP matrix nanocomposites for electrical energy storage as flexible dielectric capacitors hBN NPs and silane‐modified BNNSs are reinforced into the matrix by 0–10 wt.%. The effects of filler content and surface modification of hBN/BNNSs are discussed. 4% hBN loading results in 23.2 J·cm−3 energy density and 92% efficiency at 641 MV·m−1 breakdown strength. Those metrics are relatively high in hBN‐ or BNNS‐reinforced PVDF‐based nanocomposites.

Funder

Fundação para a Ciência e a Tecnologia

Eskişehir Teknik Üniversitesi

Publisher

Wiley

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