PVDF-based matrix with covalent bonded BaTiO3 nanowires enabled ultrahigh energy density and dielectric properties

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-01, Vol.451, p.138391, Article 138391
• Main Authors: Hu, Xin, Zhang, Hui, Wu, Deqi, Yin, Dongmei, Zhu, Ning, Guo, Kai, Lu, Chunhua
• Format: Article
• Language: English
• Subjects: Covalent bonding; Cross-linking; Dielectric property; Energy density; Nanocomposite
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2022.138391

[Display omitted] •Design of the covalent bonded cross-linked inorganic-polymer nanocomposites.•Increased dielectric constant, suppressed dielectric loss, and elevated breakdown strength.•Ultrahigh energy density of 20.78 J/cm3 at the breakdown strength of 580 MV/m. The covalent bonded cross-linked inorganic-polymer nanocomposites were designed by using high-k amine modified BaTiO3 nanowire (NH2-BTNW) and ferroelectric poly(vinylidene fluoride-co-hexafluoropropylene)-graft-poly(glycid methacrylate) (V-H-G). Compared with the fluoropolymer and physical mixed nanocomposite, increased dielectric constant, suppressed dielectric loss, and elevated breakdown strength were achieved for NH2-BTNW/V-H-G due to the formation of trapping centers arising from the networks and improved dispersity of nanofiller in the matrix. The optimal sample of 15-NH2-BTNW/V-H-G (15 wt% nanofiller loading) displayed ultrahigh energy density of 20.78 J/cm3 at the breakdown strength of 580 MV/m. This covalent bonded cross-linked inorganic-polymer nanocomposite would provide alternative strategy to design high performance dielectric materials.