Energy storage properties of composite films with relaxor antiferroelectric behaviors

Abstract Here, typical relaxor ferroelectric Ba2Bi4Ti5O18 (BBT) and antiferroelectric PbZrO3 (PZ) were selected to form BBT/PZ/BBT composite films for high energy storage performance. The composite films exhibit relaxor antiferroelectric behavior at 1000 kV/cm. A large recoverable energy storage density (Wrec) of 66.7 J/cm3 and efficiency (η) of 65.6% were achieved at 2500 kV/cm in BBT/PZ/BBT composite films. Additionally, the variation of Wrec and η was less than 4% after 5 × 107 charge-discharge cycles at 1000 kV/cm. What’s more, the energy storage performance of composite films is stable under the temperature range from 20 °C to 160 °C and frequency range from 500 Hz to 2000 Hz.