Flexible Lead-Free Na0.5bi0.5tio3-Eutio3 Solid Solution Film Capacitors with Stable and Superior Energy Storage Performances

Abstract

Flexible lead-free Na0.5Bi0.5TiO3-EuTiO3 solid solution film capacitors were fabricated. The recoverable energy storage density and energy storage efficiency reach 65.4 J/cm3 and 52 %, respectively, due to the great insulation characteristic and relaxor behaviors. And the energy storage performances for the flexible solid solution films show excellent stabilities on temperature, frequency and bending endurance, especially, with bending endurance stability over 105 cycles. The flexoelectric effect also contributes to the regulation on energy storage performances by bending the flexible films. This work provides an candidate for the flexible film capacitors with giant application potentials in wearable energy storage devices.