Enhanced Energy Storage Performance of PVDF-Based Composites Using BN@PDA Sheets and Titania Nanosheets
Congcong Zhu,
Jinghua Yin,
Yu Feng,
Jialong Li,
Yanpeng Li,
He Zhao,
Dong Yue,
Xiaoxu Liu
Affiliations
Congcong Zhu
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
Jinghua Yin
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
Yu Feng
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Jialong Li
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
Yanpeng Li
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
He Zhao
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
Dong Yue
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150080, China
Xiaoxu Liu
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
With the rapid development of modern electrical and electronic applications, the demand for high-performance film capacitors is becoming increasingly urgent. The energy density of a capacitor is dependent on permittivity and breakdown strength. However, the development of polymer-based composites with both high permittivity (εr) and breakdown strength (Eb) remains a huge challenge. In this work, a strategy of doping synergistic dual-fillers with complementary functionalities into polymer is demonstrated, by which high εr and Eb are obtained simultaneously. Small-sized titania nanosheets (STNSs) with high εr and high-insulating boron nitride sheets coated with polydopamine on the surface (BN@PDA) were introduced into poly(vinylidene fluoride) (PVDF) to prepare a ternary composite. Remarkably, a PVDF-based composite with 1 wt% BN@PDA and 0.5 wt% STNSs (1 wt% PVDF/BN@PDA−STNSs) shows an excellent energy storage performance, including a high εr of ~13.9 at 1 Hz, a superior Eb of ~440 kV/mm, and a high discharged energy density Ue of ~12.1 J/cm3. Moreover, the simulation results confirm that BN@PDA sheets improve breakdown strength and STNSs boost polarization, which is consistent with the experimental results. This contribution provides a new design paradigm for energy storage dielectrics.
