Fabrication, characterisation and dielectric properties of KH550 modified BST/PVDF nanocomposites with high dielectric strength

• Main Authors: Li Wang, Feng Gao, Jie Xu, Kena Zhang, Min Wang, Mengjie Qin
• Format: Article
• Language: English
• Published: Wiley 2016-11-01
• Series: High Voltage
• Subjects: electric strength; nanocomposites; filled polymers; barium compounds; strontium compounds; nanoparticles; tape casting; sol-gel processing; dielectric materials; dielectric property; KH550 modified BST-PVDF nanocomposite; dielectric strength; poly(vinylidene fluoride); tape casting method; sol-gel method; homogeneous distribution; polymer matrix; interface connectivity; energy storage density; dielectric tunability; microwave device; supercapacitor; energy storage device application; high-voltage environment; BST
• Online Access: https://digital-library.theiet.org/content/journals/10.1049/hve.2016.0065

Ba(0.6)Sr(0.4)TiO(3) (BST)/poly(vinylidene fluoride) (PVDF) 0–3 nanocomposites with BST nanoparticle contents of 10–40 vol% were prepared by tape casting method. The BST nanoparticles with ∼60 nm crystal size and accurate atomic ratio were synthesised by sol–gel method. The effect of the BST nanoparticle contents on the microstructure and dielectric properties of BST/PVDF nanocomposites were investigated. The BST/PVDF nanocomposites system declares that feasibility of applying low contents nanoparticles to form a homogeneous distribution in polymer matrix, higher dense interface connectivity, thereby providing a significant improvement to the dielectric strength and energy storage density; meanwhile, the nanocomposites possess high dielectric tunability. In this study, the maximum dielectric strength ∼287.12 kV/mm and energy storage density ∼5.15 J/cm^3 were obtained in 10 vol% BST/PVDF nanocomposites, respectively. Moreover, the nanocomposite possesses high dielectric tunability ∼62.6% at 58 kV/mm, which proposed the nanocomposites suitable for tunable microwave devices, supercapacitors and energy storage device applications at high-voltage environment.