High-entropy BNT-based energy storage ceramic

High energy storage density

High-entropy relaxor ferroelectric ceramic achieving both high energy storage density and high efficiency through tolerance factor tuning.

Jielin, Zha · Jiayue, Liu · Lü, Xiaomei · Hu, Xueli · Zijing, Wu · Zhou, Min · Huang, Fengzhen · Ying, Xuenong · Zhu, Jinsong

Journal of Alloys and Compounds 2026

Specifications

Recoverable energy storage density

{'zh': '7.5', 'en': '7.5'} J/cm3

Energy storage efficiency

{'zh': '87', 'en': '87'} %

Advantages

High energy storage density

A recoverable energy storage density of 7.5 J/cm³ is achieved because the substitution of Na⁺ by K⁺ with larger radius increases the tolerance factor and tetragonality, thereby enhancing polarization.

High efficiency with good stability

Energy storage efficiency is 87%, and the ceramic exhibits good temperature, frequency, and fatigue stability, along with high power density and fast charge-discharge rates.

Flexible composition design

Adjusting the A-site Bi, K, and Na ratios continuously tunes the tolerance factor, enabling systematic optimization of properties.

Applications

• Pulse power capacitors：Fast charge-discharge capability suits energy storage capacitors in pulsed power systems.
• Dielectric energy storage materials：Serve as high-energy-density dielectrics for capacitive energy storage devices.
• High-power energy storage：High power density meets demands for high-power, rapid energy storage.
• Electronic devices：Enable high-density energy supply in compact electronic devices.