材料科学
陶瓷
储能
电场
铅(地质)
能量密度
凝聚态物理
工程物理
纳米技术
热力学
复合材料
量子力学
功率(物理)
物理
地貌学
工程类
地质学
作者
Hanyu Zhao,Wanlu Cao,Cen Liang,Changyuan Wang,Chunchang Wang,Jianli Wang
标识
DOI:10.1002/adfm.202411954
摘要
Abstract Electrostatic capacitors with ultrahigh energy‐storage density are crucial for the miniaturization of pulsed power devices. A long‐standing challenge is developing dielectric materials that achieve ultrahigh recoverable energy density W rec ≥ 10 J cm −3 under moderate electric fields (30 ≤ E ≤ 50 kV mm −1 ). Herein, a specific high‐entropy strategy is proposed to modulate the phase structure and interfacial polarization of medium‐entropy base materials using linear dielectrics. This strategy ensures a sufficient polar phase and a high enough electric field for complete polarization, thereby achieving ultrahigh W rec by enhancing polarization strength. The validity of this strategy is demonstrated in the (Na 0.282 Bi 0.282 Ba 0.036 Sr 0.28 Nd 0.08 )TiO 3‐x Ca 0.7 Bi 0.2 TiO 3 (NBBSNT‐ x CBT) (x = 0–0.15) system. The CBT‐modulated samples exhibit a polyphase structure of R3c, P4bm, and Pm‐3m with reduced remnant polarization (Pr). Additionally, the addition of CBT effectively suppresses interfacial polarization, enhancing the maximum polarization ( P max ). These factors significantly improve the value of ∆P = P max − P r . As a result, an ultrahigh W rec of 10.5 J cm −3 with a high‐efficiency η of 80.3% is obtained in the x = 0.1 sample under a moderate electric field of 45 kV mm −1 for the first time. This work paves the way for achieving superior energy‐storage performance under moderate electric fields.
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