Synthesis, dielectric and ferroelectric properties of BCZTL/BCZTM bilayer ceramics for energy storage applications

(Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 –3 wt.%Li 2 CO 3 /(Ba 0.85 Ca 0.15 )(Zr 0.1 Ti 0.9 )O 3 –3 wt.%MgO (abbreviation as BCZTL/BCZTM) bilayer ceramics are prepared by the conventional solid-state reaction method. A single-perovskite structure and the diffused phase transition behavior are found in the BCZTL/BCZTM bilayer ceramics by XRD and ε − T curves. The bilayer ceramics show high energy storage density ( W rec ) 258 mJ/cm 3 and good energy storage efficiency ( η ) 82.9%. Moreover, compared with the BCZTL and BCZTM ceramics, the recoverable energy storage density of BCZTL/BCZTM bilayer ceramics has, respectively, increased by 25.8% and 10.7%. And the bilayer ceramics exhibit a good thermostability with a smaller change rate (13.38%) of W rec . Meanwhile, the energy storage efficiency obviously increases from 84.0% at 20 °C to 91.6% at 100 °C, which indicates that the BCZTL/BCZTM bilayer ceramics have a potential application in energy storage systems.