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Polar-fluoropolymer Blends for High Energy Density Low Loss Capacitor Applications

Published online by Cambridge University Press:  17 June 2011

Shan Wu
Affiliation:
Electrical Engineering Department, The Pennsylvania State University, University Park, Pennsylvania, USA. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, USA.
Minren Lin
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, USA.
David S-G. Lu
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, USA.
Qiming Zhang
Affiliation:
Electrical Engineering Department, The Pennsylvania State University, University Park, Pennsylvania, USA. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania, USA. Materials Science and Engineering Department, The Pennsylvania State University, University Park, Pennsylvania, USA.
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Abstract

Besides energy density, the electric loss at high electric fields is another major concern for many capacitor applications. This paper presents recent works in developing high energy density low loss polymer capacitors. In order to reduce the dielectric loss while maintaining high energy density in poly(vinylidene fluoride-hexafluoropropylene) P(VDF-HFP) and P(VDF-CTFE) (CTFE: Chlorotrifluoroethylene) based polymers, a polymer blend approach was investigated. We show that by blending P(VDF-CTFE) with a proper low loss polymer such as poly(ethylene- chlorotrifluoroethylene) (ECTFE) can lead to marked improvement in the loss of dielectric films. In this study, P(VDF-CTFE) blends films with different wt% of ECTFE have been examined to find a balance between dielectric constant and the loss. In addition, crosslink in the blends has been employed to further improve the dielectric performance of the blends. The results indicate that these blends exhibit an excellent performance: relatively high dielectric constant (~ 6~7) and low loss (~ 0.01) at 1 kHz. For the crosslink blend films, the high field loss is reduced to below 5% with a discharged energy density 4.3 J/cm3 under a field of 300 MV/m.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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