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Simultaneously Enhanced Permittivity and Electric Breakdown Strength of Polyacrylonitrile Composites by Introducing Ultralow Content BaSrTiO 3 Nanofibers
Author(s) -
Xu Pengpeng,
Luo Suibin,
Yu Junyi,
Cao Liqiang,
Yu Shuhui,
Sun Rong,
Wong Ching-Ping
Publication year - 2019
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201900817
Subject(s) - polyacrylonitrile , materials science , composite material , permittivity , dielectric , nanofiber , polymer , electric field , space charge , dielectric strength , optoelectronics , electron , physics , quantum mechanics
Introducing nanoparticles in a polymer matrix to simultaneously enhance permittivity and electric breakdown strength is a challenge for the polymer‐based dielectric films to obtain improved energy‐storage density and efficiency. Herein, it is demonstrated that both of the aforementioned properties are enhanced by using an ultralow content of BaSrTiO 3 nanofibers (BST NFs) with high aspect ratios (9–18) in the polyacrylonitrile (PAN) matrix. As the filler loading is 0.1–0.9 wt%, the permittivities of the composites are increased from 6.3 of the pure PAN to 6.93–7.92 at 1 kHz. The maximum electrical breakdown strength achieved at 0.3 wt% is 3865 kV cm −1 , which is much higher than that of the pure PAN of ≈2987 kV cm −1 . Significantly enhanced discharged energy density of 8.25 J cm −3 at a high charge–discharge efficiency of 83% is achieved. The electrical breakdown mechanism at ultralow filler content is investigated based on the simulation of space charges distribution.