Relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene- chlorofluoroethylene) terpolymer for high energy density storage capacitors

Baojin Chu, Xin Zhou, Bret Neese, Qiming Zhang, Francois Bauer

    Research output: Contribution to journalArticle

    100 Scopus citations

    Abstract

    This paper investigates the relaxor ferroelectric polymer-poly(vinylidene fluoride/trifluoroethylene/chlorofluoroethylene) terpolymer for energy storage capacitors. It is found that the high dielectric constant (> 50 at 1 kHz) and high reversible polarization in the terpolymer lead to a high electric energy density ∼10 J/cm3, achieved under an electric field of more than 350 MV/m. The high dielectric constant also causes the polarization saturation at fields much below the breakdown field and whereby the discharged energy density increases nearly linearly with applied field, distinctively different from the low dielectric constant linear dielectric polymers whose energy density rises with square of the applied field. The strong frequency dispersion and nonlinear polarization response (polarization saturation) of the relaxor terpolymer result in a low effective capacitance at the beginning of the discharge and the effective capacitance increases with time during the discharge. Furthermore, due to the frequency dispersion and nonlinear effect, the discharged energy density of the terpolymer to a resistor load RL increases with RL. A large RL will lead to high discharge efficiency in the terpolymer capacitor.

    Original languageEnglish (US)
    Article number1714943
    Pages (from-to)1162-1168
    Number of pages7
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume13
    Issue number5
    DOIs
    StatePublished - Oct 1 2006

      Fingerprint

    All Science Journal Classification (ASJC) codes

    • Electrical and Electronic Engineering

    Cite this