Contrary to inorganic ceramics of ferroelectrics such as BaTiO3, which show huge permittivity values, but low breakdown fields, polymers can typically withstand significantly stronger electric fields, with breakdown strengths 10-100 higher than ceramics. Polar VDF-derived homo-, copo-and ter-polymers have been intensively studied, especially poly(vinylidenefluoride-ter-trifluoroethylene-ter-chlorofluoroethylene) P(VDF-ter-TrFE-ter-CFE), which is a prime candidate for various energy-related applications due to its room-temperature permittivity > 50. It has been reported to display high energy densities, with Ue = 5-10 J•cm -3 . Unfortunately, non-linear dielectrics suffer from high polarization hysteresis, which induces significant dielectric losses and limits the efficiency of the discharged process, η, which can be defined as: