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However, it is necessary to increase the energy density of dielectric capacitors. In this context, poly(vinylidene fluoride\u2010co\u2010hexafluoropropylene), PVDF\u2010HFP, matrix nanocomposites are produced by solution casting method reinforced with hexagonal boron nitride (hBN) nanoparticles and silane\u2010modified boron nitride nanosheets \u2010BNNSs\u2010 (BNNS\u2010VTS) up to 10\u2009wt.% filler content. The effects of filler content and surface modification of hBN\/BNNSs on PVDF\u2010HFP matrix nanocomposites' microstructure, phase evolution, crystalization behavior, dielectric properties, and energy storage performance are discussed. 4% hBN\/PVDF\u2010HFP nanocomposite demonstrates 641 MV\u00b7m<jats:sup>\u22121<\/jats:sup> of breakdown strength and 23.2\u2009J\u00b7cm<jats:sup>\u22123<\/jats:sup> 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\u2010 or BNNS\u2010reinforced PVDF\u2010based nanocomposites, even in multi\u2010layered structures. Furthermore, 4% hBN\/PVDF\u2010HFP presents a giant charge\u2013discharge energy efficiency (92%). It is thus demonstrated that hBN\/PVDF\u2010HFP nanocomposites hold a great potential to be used in energy storage applications as flexible and lightweight dielectric capacitors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Highlights<\/jats:title><jats:p><jats:list list-type=\"bullet\">\n<jats:list-item><jats:p>PVDF\u2010HFP matrix nanocomposites for electrical energy storage as flexible dielectric capacitors<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>hBN NPs and silane\u2010modified BNNSs are reinforced into the matrix by 0\u201310\u2009wt.%.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>The effects of filler content and surface modification of hBN\/BNNSs are discussed.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>4% hBN loading results in 23.2\u2009J\u00b7cm<jats:sup>\u22123<\/jats:sup> energy density and 92% efficiency at 641 MV\u00b7m<jats:sup>\u22121<\/jats:sup> breakdown strength.<\/jats:p><\/jats:list-item>\n<jats:list-item><jats:p>Those metrics are relatively high in hBN\u2010 or BNNS\u2010reinforced PVDF\u2010based nanocomposites.<\/jats:p><\/jats:list-item>\n<\/jats:list><\/jats:p><\/jats:sec>","DOI":"10.1002\/pc.28911","type":"journal-article","created":{"date-parts":[[2024,8,11]],"date-time":"2024-08-11T22:41:02Z","timestamp":1723416062000},"page":"16556-16573","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["<scp>hBN<\/scp>\/<scp>PVDF<\/scp>\u2010<scp>HFP<\/scp> and <scp>BNNS<\/scp>\/<scp>PVDF<\/scp>\u2010<scp>HFP<\/scp> nanocomposites as flexible and lightweight dielectric capacitors: High energy storage performance via electrically insulating nanoparticles"],"prefix":"10.1002","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4696-1459","authenticated-orcid":false,"given":"Levent","family":"Koroglu","sequence":"first","affiliation":[{"name":"Department of Materials Science and Engineering Eskisehir Technical University  Eskisehir 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Portugal"}]},{"given":"Erhan","family":"Ayas","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Eskisehir Technical University  Eskisehir T\u00fcrkiye"}]},{"given":"Senentxu","family":"Lanceros\u2010Mendez","sequence":"additional","affiliation":[{"name":"BCMaterials, Basque Center for Materials Applications and Nanostructures UPV\/EHU Science Park  Leioa Spain"},{"name":"Physics Centre of Minho and Porto Universities (CF\u2010UM\u2010UP) and Laboratory of Physics for Materials and Emergent Technologies (LapMET) University of Minho  Braga Portugal"},{"name":"IKERBASQUE, Basque Foundation for Science  Bilbao Spain"}]},{"given":"Nuran","family":"Ay","sequence":"additional","affiliation":[{"name":"Department of Materials Science and Engineering Eskisehir Technical University  Eskisehir 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