Investigation On The Energy-storage Performance Of PbZrO₃-based Antiferroelectric Thick Films Fabricated On Metal Substrate

Among the dielectric materials,Antiferroelectric?AFE?materials exhibit high saturation polarization and low remanent polarization,which is beneficial to obtain higher energy-storage density.In addition,it also has the advantages of high breakdown strength and fast discharge speed,which is expected to be applied in high power density capacitors.In this work,a lead-zirconium-based AFE thick film was prepared on a metal substrate by sol-gel method.The phase structure,surface morphology,antiferroelectricity,dielectric properties,electrical conductivity and energy-storage properties were studied.In order to further improve the practical application of thick film,flexible thick film and multilayer capacitors were prepared to study their energy storage and dielectric properties.AFE Pb_0.94La_0.04Zr_0.97Ti_0.03O₃ thick film was successfully fabricated on nickel foils by using sol-gel method.The film exhibits dense microstructure with low surface roughness and pure perovskite phase.It displays high dielectric constant of 433 at 100 kHz and room temperature,which is 28%larger than that on traditional silicon substrate.Calculated by hysteresis loop,the recoverable energy-storage density of 18.4 J/cm³and the efficiency value of 54%at 1400 kV/cm are obtained in the thick film.Measured by resistance-inductance-capacitance circuit,the maximum pulsed discharge energy-storage density of 12.4 J/cm³is found at the same electric field of 1400 kV/cm.Moreover,90%of the energy is released in a short time of about 84 ns,displaying super-fast discharging characteristic.The AFE thick film grown on metal substrate with high discharge energy-storage density and fast discharge time provides strong potential for the application in modern electronics and electrical power systems.Flexible AFE Pb_0.94La_0.04Zr_0.97Ti_0.03O₃ thick-film capacitors were fabricated on nickel foil substrates using sol-gel method.The thick film shows pure perovskite phase with dense microstructure.The discharge energy-storage properties of the thick film are directly evaluated by the RLC circuit.The maximum value of the discharge energy-storage density is 15.8 J/cm³at 1400 kV/cm and 90%of the corresponding energy is released in a short time of about 250 ns.In addition,the discharge energy-storage density and discharge time could be adjusted by the bent radius of the film,which provides a simple and feasible solution for the regulation of the electrical performance.Furthermore,the flexible AFE film exhibits good mechanical properties under cycling tests with bending radii down to2.5 mm and 1500 rounds.In order to further improve the practical application of AFE thick film,combined with the research results of the above work,a large-electrode AFE multilayer capacitor was fabricated by paralleling single-layer thick film method and its capacitance and discharge energy storage characteristics were studied.The results show that the capacitance of the multilayer capacitor reaches 3010 nF with applied voltage of 30 V.The breakdown strength reaches up to 734 kV/cm and the maximum discharge current is 0.16 A.Moreover,the electrical performance can be adjusted by changing the dielectric layers and electrode area of the multilayer capacitor.