Nong Peng, Huang Jiangping, Pan Yue, Dong Qinpeng, Li Xu, Chen Xiuli, Zhou Huanfu
Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guangxi Key Laboratory of Optoelectronic Materials and Devices, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China.
Small. 2025 Feb;21(5):e2406059. doi: 10.1002/smll.202406059. Epub 2024 Dec 18.
Advancements in pulsed electronic power systems depend significantly on high-performance dielectric energy storage ceramics. Lead-free NaNbO-based energy-storage ceramics are important materials for next-generation pulsed power capacitors owing to their large polarization and bandgaps. However, the high energy loss caused by the antiferroelectric-ferroelectric phase transition leads to low recoverable energy storage density and efficiency, which hinders its practical application. Herein, a weakly coupled relaxor ferroelectric is designed via chemical modification, which realises a high recoverable density of 12.7 J cm and a decent η of 85.7%. Compositionally induced domain-size refinement effectively delays low-field polarization saturation and elevates η. Experimental characterization and theoretical-model analysis confirm that the superior comprehensive energy-storage performance is attributed to the component-driven formation of polar nano-micro-regions with weak interactions, which suppresses the polarization hysteresis and improves the polarization difference. This study demonstrates that component-driven construction of weakly coupled relaxor ferroelectric materials is an effective strategy for achieving ultrahigh energy-storage characteristics.
脉冲电子功率系统的进步在很大程度上依赖于高性能介电储能陶瓷。无铅铌酸钠基储能陶瓷因其大极化和带隙，是下一代脉冲功率电容器的重要材料。然而，反铁电 - 铁电相变引起的高能量损耗导致可恢复储能密度和效率较低，这阻碍了其实际应用。在此，通过化学改性设计了一种弱耦合弛豫铁电体，实现了12.7 J/cm³的高可恢复密度和85.7%的良好η。成分诱导的畴尺寸细化有效地延迟了低场极化饱和并提高了η。实验表征和理论模型分析证实，优异的综合储能性能归因于由组分驱动形成的具有弱相互作用的极性纳米微区，这抑制了极化滞后并改善了极化差异。本研究表明，组分驱动构建弱耦合弛豫铁电材料是实现超高储能特性的有效策略。
