High Energy Storage Performance in La-Doped AgNbO₃ Ceramics via Tape Casting

AgNbO₃-based Pb-free antiferroelectric (AFE) ceramics have attracted increasing interest owing to their excellent potential in energy storage applications. Herein, a high recoverable energy storage density (W_rec) of 7.62 J/cm³ is realized in La-doped AgNbO₃ ceramics prepared via tape casting. The high W_rec is attributed to high breakdown strength E_b of 380 kV/cm induced by dense microstructure as well as fine grain size and enhanced AFE stability stemming from M₂ phase and reduced tolerance factor t. The high W_rec exceeding 6 J/cm³ was maintained in a wide temperature range of 20-150 °C and exhibited frequency stability with less than 8% variation in a range of 1-200 Hz. The discharge energy density W_d exhibited temperature stability at 30-110 °C with less than 9% variation. Our research provides a good method for producing AgNbO₃-based ceramics having high energy storage performances.