Surface modified BaTiO^sub 3^ nanoparticles by titanate coupling agent induce significantly enhanced breakdown strength and larger energy density in PVDF nanocomposite

Dielectric capacitors are promising in micro-electronics, portable equipment and hybrid electric vehicles due to their specific features of flexibility, ultrahigh operating voltage and fast charging-discharging rate. The dielectric properties of polymer-based nanocomposite are much related to the in...

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Bibliographic Details
Published in:Composites science and technology 2018-03, Vol.156, p.109
Main Authors: Hu, Penghao, Gao, Shengmin, Zhang, Yangyang, Zhang, Liang, Wang, Chengchen
Format: Article
Language:English
Subjects:
Breakdown
Compatibility
Coupling agents
Density
Dielectric properties
Dielectric strength
Electric vehicles
Energy efficiency
Energy storage
Fillers
Flux density
Hybrid electric vehicles
Nanocomposites
Nanoparticles
Portable equipment
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Summary:Dielectric capacitors are promising in micro-electronics, portable equipment and hybrid electric vehicles due to their specific features of flexibility, ultrahigh operating voltage and fast charging-discharging rate. The dielectric properties of polymer-based nanocomposite are much related to the interface binding between fillers and matrix. In this work, a surface modification approach employed newfound titanate coupling agent was developed to improve the compatibility between BT nanoparticles and PVDF matrix. After treated by the modifier TC-2, a coating layer contained with active organic groups was formed on the surface of BT nanoparticles. Benefited from the improved dispersibility and compatibility of modified BT nanoparticles in PVDF matrix, the breakdown strength of the nanocomposites was much enhanced. The monodisperse mBT-2 nanoparticles treated with appropriate amount of modifier dramatically enlarged the breakdown strength from 397 kV/mm for neat PVDF to 517 kV/mm for 4 vol% mBT-2 loading nanocomposite. Compared with BT/PVDF, the improvements on the energy storage performance in mBT-2/PVDF are significant The maximum discharged energy density of 11.27 J/cm3 for 4 vol% loading mBT-2/PVDF is nearly double of that for 4 vol% loading BT/PVDF, and the energy efficiency for mBT-2/PVDF is also increased. The modification method originally represented here has great potential in developing high energy density nanocomposites for advanced applications.
ISSN:0266-3538
1879-1050