Enhancing breakdown strength and energy storage performance of PVDF-based nanocomposites by adding exfoliated boron nitride
| Autor: | Yunchuan Xie, Yangyang Yu, Wanrong Jiang, Zhicheng Zhang, Jian Wang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Composite number General Physics and Astronomy 02 engineering and technology Dielectric 010402 general chemistry 01 natural sciences chemistry.chemical_compound Electrical resistivity and conductivity Ceramic Composite material chemistry.chemical_classification Nanocomposite Surfaces and Interfaces General Chemistry Polymer 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films chemistry Boron nitride visual_art visual_art.visual_art_medium Dielectric loss 0210 nano-technology |
| Zdroj: | Applied Surface Science. 440:1150-1158 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2018.01.301 |
| Popis: | Polymer/ceramic nanocomposites are promising dielectrics for high energy storage density (Ue) capacitors. However, their low breakdown strength (Eb) and high dielectric loss due to heterogeneous structure seriously limit their applications under high electric field. In this work, boron nitride nano-sheets (BNNS) exfoliated from BN particles were introduced into PVDF-based BaTiO3 (mBT) binary composites to reduce the dielectric loss and promote the Ue. The effects of BNNS on the dielectric properties, especially breakdown resistance, and energy storage performance of the resultant composites were carefully investigated by comparing with the composites without BNNS. The introduction of BNNS could significantly improve Eb and Ue of the final composites. Ternary composite with particle contents of 6 wt% BNNS and 5 wt% mBT presented a Eb of about 400 MV/m and Ue of 5.2 J/cm3, which is 40% and 30% superior to that of the binary composite with 5 wt% mBT, respectively. That may be attributed to the 2D structure, high bulk electrical resistivity, and fine dispersion in PVDF of BNNS, which is acting as an efficient insulating barrier against the leakage current and charges conduction. The depression effect of BNNS onto the charge mobility and the interfacial polarization of the polymer composites is finely addressed, which may offer a promising strategy for the fabrication of high-k polymer composites with low loss. |
| Databáze: | OpenAIRE |
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