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<p>Dielectric capacitors are critical for advanced energy storage due to their ultrahigh power density and rapid charge-discharge rates. However, their application is limited by the low energy density. Here, we design a BaTiO<sub>3</sub>-(K<sub>0.5</sub>Na<sub>0.5</sub>)NbO<sub>3</sub>-(Bi<sub>0.5</sub>Na<sub>0.5</sub>)Ti<sub>0.9</sub>Zr<sub>0.1</sub>O<sub>3</sub> solid-solution system through synergistic polymorphic nanodomain engineering and defect optimization. By engineering polymorphic nanodomains with coexisting rhombohedral, orthorhombic, tetragonal, cubic nanodomain in 1.0–2.0 nm size and defect design with reduces oxygen vacancy concentration and forms defect complexes, we achieve an ultrahigh energy density of 18.7 J cm⁻<sup>3</sup> with remarkable efficiency of 92.1% in multilayer ceramic capacitors, along with excellent cycling stability (&gt;10<sup>7</sup> cycles) and thermal stability (&lt;±5% from 25 to 150 °C). In this work, we provide a paradigm for designing high-performance dielectric capacitors through the synergistic manipulation of domain structures and defect engineering.</p>

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Ultrahigh energy-storage dielectric ceramics via synergistic polymorphic nanodomain and defect design

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月20日

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  • Min Zhang,
  • Yuzhou He,
  • Hao Pan,
  • Qinghua Zhang,
  • Peixuan Jing,
  • Weijia Guo,
  • Hongdong Cai,
  • Ce-Wen Nan,
  • Yuan-Hua Lin

摘要

Dielectric capacitors are critical for advanced energy storage due to their ultrahigh power density and rapid charge-discharge rates. However, their application is limited by the low energy density. Here, we design a BaTiO3-(K0.5Na0.5)NbO3-(Bi0.5Na0.5)Ti0.9Zr0.1O3 solid-solution system through synergistic polymorphic nanodomain engineering and defect optimization. By engineering polymorphic nanodomains with coexisting rhombohedral, orthorhombic, tetragonal, cubic nanodomain in 1.0–2.0 nm size and defect design with reduces oxygen vacancy concentration and forms defect complexes, we achieve an ultrahigh energy density of 18.7 J cm⁻3 with remarkable efficiency of 92.1% in multilayer ceramic capacitors, along with excellent cycling stability (>107 cycles) and thermal stability (<±5% from 25 to 150 °C). In this work, we provide a paradigm for designing high-performance dielectric capacitors through the synergistic manipulation of domain structures and defect engineering.