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Updated: Jan 13, 2026
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
Ultrahigh energy storage density and efficiency in AgNbO3-based ceramics by percolating interaction between antipolar
Liqiang He1, Le Zhang2, Yating Ran3
1Frontier Institute of Science and Technology, School of Physics, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
None:
A critical challenge for the application of lead-free antiferroelectrics in energy storage systems is their poor thermal stability and low efficiency when the superior energy storage density is attained, primarily due to the inherent first-order nature and narrow temperature window of antiferroelectric-to-ferroelectric transitions. Here, we elucidate a unique percolating interaction between antipolar regions in antiferroelectrics and engineered defect pairs using density functional theory and phase field calculations. Strategic distribution of the strongly coupled Li-Ta pairs in AgNbO3 fosters a percolating interaction that facilitates antipolar rotations, enabling a pronounced polarization change with minimal hysteresis. Guided by theoretical calculations, a large recoverable energy storage density of 12.8 J/cm3, with a high efficiency of 90%, is achieved at room temperature in Ag0.95Li0.05Nb0.35Ta0.65O3 ceramics. Moreover, the superior energy storage performance can remain stable within a wide temperature range from -70 to 170 °C, which paves the way for application in advanced energy capacitors.
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