fig5

Figure 5. Frequency and cycling stability of the P(VDF-TrFE-CFE)/PMMA 50/50 wt.% film measured at 3,000 kV/cm. (A) Unipolar P-E loops measured at different frequencies (50-500 Hz); (B) P_max, P_r, and polarization difference at different frequencies; (C) discharged energy density U_e, total energy density U, and energy efficiency η at different frequencies; (D) Unipolar P-E loops after different cycle numbers; (E) P_max, P_r, and polarization difference versus cycle number; (F) U_e, U, and η versus cycle number. P-E: Polarization-electric field; P(VDF-TrFE-CFE): poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene); PMMA: poly(methyl methacrylate); CFE: abbreviation of P(VDF-TrFE-CFE); P_max: maximum polarization; P_r: remanent polarization; U_e: discharged energy density; U: total energy density; η: energy-storage efficiency.