Significantly enhanced electrostatic energy storage performance of P(VDF-HFP)/BaTiO3-Bi(Li0.5Nb0.5)O3 nanocomposites

• Published in: Nano energy 2020-12, Vol.78, p.105247, Article 105247
• Main Authors: Wang, Peng-Jian, Zhou, Di, Li, Jing, Pang, Li-Xia, Liu, Wen-Feng, Su, Jin-Zhan, Singh, Charanjeet, Trukhanov, Sergei, Trukhanov, Alex
• Format: Article
• Language: English
• Subjects: BaTiO3-Bi(Li0.5Nb0.5)O3; Breakdown strength; Energy storage; Nanocomposite
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2020.105247

Microelectronics and electrical power systems require dielectric polymer-based dielectrics with high energy density that are simple to process. However, the currently available polymer-based dielectric materials require demanding process conditions and relatively low energy density. Herein, we propose P(VDF-HFP)-based nanocomposite by a simple and practical mechanical method based on a combination of solid phase reaction and sieving to prepare 0.88BaTiO3-0.12Bi(Li0.5Nb0.5)O3 nanoparticles (BT-BLN nps). The experimental and simulation result verify that the BT-BLN nps significantly improve the breakdown strength and energy storage performance of dielectric materials. Remarkably, the highest discharge energy density of the BT-BLN/P(VDF-HFP) nanocomposite film reached 14.2 J/cm3 with the addition of 3 vol% BT-BLN nanofiller at 497 MV/m, which is much higher than that of pure P(VDF- HFP) (Ud ≈ 6.6 J/cm3 and Eb ≈ 391.3 MV/m). Encouragingly, the Young's modulus of BLN-3vol%/P(VDF-HFP) reached 2.6 GPa, which is approximately 2.65 times higher than that of pure P(VDF-HFP) (0.98 GPa). This work established a simple and effective strategy, for solution casting processable dielectrics with performance comparable to that of fillers prepared by the liquid phase method. Significantly energy storage performance with the discharge energy density (Ud) of 14.2 J/cm3 and energy storage efficiency (η) of 55.5% can be achieved by introducing an improved solid-state reaction method to prepare BT-BLN nanofillers. [Display omitted] •BT-BLN nanoparticles were first reported as nanocomposite filler for dielectric energy storage capacitors.•The optical image of the BT-BLN/P(VDF-HFP) nanocomposite film shows high transparency and flexibility.•The highest discharge energy density reached 14.2 J/cm3 with the addition of 3 vol% BT-BLN nanofiller at 497 MV/m.