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- Title
Energy Storage and Mechanical Performance of PVDF-HFP/SWCNT Composites with Low Permeability.
- Authors
Yue, Dong; Liu, Xiaoxu; Yin, Jinghua; Feng, Yu; Li, Jialong; Zhao, He; Li, Yanpeng; Li, Li
- Abstract
Polymer dielectric capacitors, with their high energy storage density and fast release of energy, have recently received increasing attention for their ability to meet the critical requirements of pulsed power devices in low-consumption systems. In this context, this paper reports that surface-modified single-walled carbon nanotubes (SWCNT) were successfully synthesized and used as fillers to improve the energy storage and mechanical performance of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based composites. The PVDF-HFP/SWCNT composites realize high dielectric constants and low percolation thresholds of 62 and 0.25, respectively. In particular, when composites possess an SWCNT content of only 0.4 vol.%, an acceptable energy storage density of 0.24 J/cm3 at a low electric field of 700 kV/cm along with a high energy storage efficiency (74%) is also observed. Meanwhile, the tensile strength and breaking elongation are 44 MPa and 8.1%, respectively. According to detailed characterization results, SWCNT with low filling are uniformly dispersed and show a certain orientation in PVDF-HFP after surface modification, which is the key to improve the composite performance. These results provide an effective method for fabricating flexible-polymer composites with a high density of energy storage. In the current study, the surface-modified single-walled carbon nanotubes were successfully synthesized and used as fillers to improve the energy storage and mechanical performance of poly(vinylidene fluoride-co-hexafluoropropylene)-based composites. SWCNT with low filling is uniformly dispersed and shows a certain orientation in PVDF-HFP after surface modification, which is the key to improving the composite performance. This work may open a pathway to meet the needs of pulsed power devices in a low electric field.
- Subjects
MECHANICAL energy; PERMEABILITY; ENERGY density; PERMITTIVITY; ENERGY storage; CARBON nanotubes
- Publication
NANO, 2021, Vol 16, Issue 4, pN.PAG
- ISSN
1793-2920
- Publication type
Article
- DOI
10.1142/S1793292021500405