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access icon openaccess Enhancing discharged energy density and suppressing dielectric loss of poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorofluoroethylene) by a sandwiched structure

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 04/05/2018, Accepted 20/07/2018, Revised 18/07/2018, Published 06/09/2018

Polymer dielectrics with high energy density and low dielectric loss are highly desired due to the rapid development of electric devices. Among known polymers, poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorofluoroethylene) P(VDF-TrFE-CFE) is one of the promising materials for energy storage capacitor applications because of its high dielectric constant. Nevertheless, it suffers from high dielectric loss especially at the high electric field, which suppresses its breakdown strength and energy storage density. Herein, sandwiched structure dielectric films were fabricated by employing polymethyl methacrylate (PMMA) as the outer layer and P(VDF-TrFE-CFE) as the central layer. By modulating the thickness of the central layer, an enhanced discharged energy density of 7.03 J/cm3 is achieved at a high electric field of 480 MV/m, which is 132% more than that of P(VDF-TrFE-CFE) at its maximum electric field 300 MV/m. Meanwhile, this sandwiched structure film also retains a high discharge efficiency of 78% at 480 MV/m, which is never been seen in polyvinylidene fluoride-based polymers. Results show that PMMA acts as charge barrier and simultaneously enhance the breakdown strength and suppress the dielectric loss of P(VDF-TrFE-CFE).

Inspec keywords: polymer films; electric strength; permittivity; dielectric losses; electric breakdown; sandwich structures; dielectric thin films; capacitors; dielectric hysteresis

Other keywords: polymer dielectrics; dielectric loss; charge barrier; polymethyl methacrylate; poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorofluoroethylene); breakdown strength; dielectric constant; D-E loops; discharge efficiency; energy storage density; discharged energy density; sandwiched structure dielectric films

Subjects: Dielectric thin films; Thin film growth, structure, and epitaxy; Dielectric breakdown and space-charge effects; Structure of polymers, elastomers, and plastics; Dielectric permittivity; Dielectric loss and relaxation; Ferroelectric domain structure and effects; hysteresis

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