Lead-free La2Ti2O7 dielectric ceramics with ultra-high energy storage density and electric field durability through layered ferroelectric layers
Abstract
Perovskite oxides have emerged as predominant materials in energy storage capacitor research. The development of lead-free dielectric capacitors featuring innovative architectures, high energy storage density, and superior high-voltage endurance could substantially advance this field. In this study, we synthesized La2Ti2O7 ceramics with compositional simplicity that exhibit promising industrial applicability. Their exceptional electric field resistance originates from three key characteristics: a wide bandgap (∼3.81 eV), uniform distribution of fine-grained dense microstructures, and stable titanium valence states. Notably, under an ultrahigh electric field of 1100 kV cm−1, the ceramics demonstrate minimal residual polarization (1.31 μC cm−2) while achieving maximum polarization intensity (∼19.98 μC cm−2) comparable to conventional strong ferroelectrics. Furthermore, these ceramics exhibit outstanding energy storage density (8.83 J cm−3), rapid discharge kinetics, and exceptional cyclic stability. This investigation pioneers the systematic evaluation of La2Ti2O7 ceramics for energy storage applications. The comprehensive results substantiate the material's exceptional potential for high-field energy storage systems.
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