Structure design boosts concomitant enhancement of permittivity, breakdown strength, discharged energy density and efficiency in all-organic dielectrics
| Autor: | Zhenkang Dan, Weibin Ren, Mengfan Guo, Zhonghui Shen, Tao Zhang, Jianyong Jiang, Cewen Nan, Yang Shen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
hot pressing
polymer blends nanocomposites nanofabrication permittivity electrospinning filled polymers electric breakdown electrical conductivity polymer fibres all-organic dielectrics polymer-based nanocomposites intrinsic high breakdown strength high energy density capacitors all-organic nanocomposites combinatorial electrospinning hot-pressing method polymethyl methacrylate discharged energy density energy storage performance enhanced breakdown strength efficiency applications ferroconcrete-like structure poly(vinylidene fluoride-co-hexafluoropropylene) reinforcement phase large aspect ratio p(vdf-hfp) fibres external field mechanical properties carrier motion electrical conduction dielectric composite Materials of engineering and construction. Mechanics of materials TA401-492 |
| Zdroj: | IET Nanodielectrics (2020) |
| Druh dokumentu: | article |
| ISSN: | 2514-3255 |
| DOI: | 10.1049/iet-nde.2020.0034 |
| Popis: | Polymer-based nanocomposites with excellent flexibility and intrinsic high breakdown strength are promising candidates for high energy density capacitors compared to ceramics counterparts. However, their energy density is relatively low due to the trade-off between permittivity and breakdown strength. In this work, the authors proposed a ferroconcrete-like structure for all-organic nanocomposites via combinatorial electrospinning and hot-pressing method. In this structure, polymethyl methacrylate (PMMA) serves as matrix while poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) serves as reinforcement phase. This novel structure is highly effective in breaking the paradox of improved discharged energy density with decreased efficiency, as evidenced by the concurrently improved discharged energy density (∼12.15 J/cm^3 compared to 8.82 J/cm^3 of the matrix) and efficiency (∼81.7% compared to 76.8% of the matrix). Compared to conventional blending composite films, samples with ferroconcrete-like structure exhibit higher permittivity, breakdown strength, discharged energy density and efficiency. The superior energy storage performance is attributed to large aspect ratio P(VDF-HFP) fibres distributed perpendicularly to the external field, which brings about the extra enhancement of permittivity. Besides, mechanical properties are improved and restriction on carrier motion is facilitated, leading to enhanced breakdown strength and suppressed conduction. This work provides a new way to design dielectric composite for high energy density and efficiency applications. |
| Databáze: | Directory of Open Access Journals |
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