High-efficiency energy storage in BiFeO3 composite ceramics via BaO-TiO2-SiO2 glass modification

Electric breakdown strength, fatigue resistance, and low-temperature sintering are critical factors in the high power-density dielectric capacitors in regard to energy-storage capability. This work highlights the energy-storage performance in the 45BaO-32TiO(2)-23SiO(2) (BTS) glass-added BiFeO3 composite ceramics (x = 0, 0.5, 1, 3, 5, and 7 wt%). The BTS additive in the BiFeO3 ceramic matrix raises breakdown electric field (E-b > 400 kV/cm), thermal stability (>100 degrees C), and fatigue resistance (> 1 x10(4) charge-discharge cycles). The maximal energy efficiencies (eta) and recoverable energy densities (W-rec) are about 83.5 % and 1.19 J/cm(3) in 1 wt%-BTS addition and 76.4 % and 1.36 J/cm(3) in 3 wt%-BTS addition. High energy efficiency and E field can be linked to the glass network, which acts as a conduction barrier in the matrix to reduce current leakage. This work presents an effective composite design for improving storing efficiency and applied E field through the glass integration.