Authors
Fei Yan, Hongyu Yang, Simin Wang, Zihao Zheng, Hairui Bai, Haibo Yang, Da Li, Weiwei Wang, Jinming Guo, Jiwei Zhai
Published in
Advanced materials (Deerfield Beach, Fla.). Pages e73852. Jun 29, 2026. Epub Jun 29, 2026.
Abstract
Dielectric capacitors offering ultrafast charge-discharge capability and superior reliability are essential for advanced electronic systems, but achieving both high energy density and efficiency within simple and eco-friendly compositions remains a great challenge. Here, guided by machine learning, we achieve high-efficiency and thermally stable capacitive energy storage in strontium titanate-based ceramics. Through synergistic local structural engineering and optimized fabrication process, the materials exhibit enhanced polarization, reduced hysteresis loss, and improved breakdown strength. The designed materials deliver an ultrahigh energy density of 10.69 J cm-3 with a near-ideal efficiency of ∼97% and a record high figure of merit of 392 J cm-3 at room temperature, and retains high performance at 150°C with a figure of merit of 152 J cm-3 and an efficiency of ∼94%. This remarkable performance arises from the incorporation of Bi3+ ions with high polarizability at the A-sites of strontium titanate quantum paraelectrics, which breaks structural symmetry and induces lattice and octahedral distortions, leading to the formation of nanoscale polar clusters with highly dynamic fluctuations. These findings establish a compositionally simple, environmentally benign pathway for developing dielectrics with superior energy storage capability and thermal stability, offering new opportunities for high-performance capacitive energy storage systems.
PMID:
42371681
Bibliographic data and abstract were imported from PubMed on 29 Jun 2026.
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