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Dielectric ceramics have been used in various electronic devices, especially energy storage applications. Recently, the high-entropy design of dielectric ceramics has attracted increasing attention due to the high energy storage density. However, the high-entropy design ceramics are rarely reported in the lead-free Bi0.5Na0.5TiO3-based dielectric ceramics. Therefore, this research investigates the phase evolution and the energy density of the high-entropy (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramics. The (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramic samples are prepared using a solid-state reaction process with M = Ba2+ and La3+ ions. The (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramics are studied with different doping concentrations of x = 0–0.04. The Ba2+ ions modified ceramics show the acceptor effects while the La3+ ions modified samples show the isovalent effects. As expected, the isovalent doping significantly enhances the energy storage density of (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramics due to the high entropy design. Interestingly, the (Bi0.47Na0.41K0.09La0.03)TiO3 ceramic demonstrates notable potential for lead-free capacitors, achieving an energy storage density of 0.55 J/cm3 and a high energy storage efficiency of 75%.

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Energy Storage Enhancement in High-Entropy Lead-Free Bi-Based Ceramics by Impurity Doping

  • 会议论文

  • 发表日期：

    2025年

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  • Thi Hinh Dinh,
  • Vinh Le Van,
  • Tu Le Manh

摘要

Dielectric ceramics have been used in various electronic devices, especially energy storage applications. Recently, the high-entropy design of dielectric ceramics has attracted increasing attention due to the high energy storage density. However, the high-entropy design ceramics are rarely reported in the lead-free Bi0.5Na0.5TiO3-based dielectric ceramics. Therefore, this research investigates the phase evolution and the energy density of the high-entropy (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramics. The (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramic samples are prepared using a solid-state reaction process with M = Ba2+ and La3+ ions. The (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramics are studied with different doping concentrations of x = 0–0.04. The Ba2+ ions modified ceramics show the acceptor effects while the La3+ ions modified samples show the isovalent effects. As expected, the isovalent doping significantly enhances the energy storage density of (Bi0.5-xNa0.41K0.09Mx)TiO3 ceramics due to the high entropy design. Interestingly, the (Bi0.47Na0.41K0.09La0.03)TiO3 ceramic demonstrates notable potential for lead-free capacitors, achieving an energy storage density of 0.55 J/cm3 and a high energy storage efficiency of 75%.