电容器
陶瓷
电介质
材料科学
储能
介电常数
介电损耗
电压
复合材料
光电子学
电气工程
物理
热力学
功率(物理)
工程类
作者
Wenjing Shi,Leiyang Zhang,Ruiyi Jing,Yunyao Huang,Fukang Chen,V. Ya. Shur,Xiaoyong Wei,Gang Liu,Hongliang Du,Li Jin
标识
DOI:10.1007/s40820-023-01290-4
摘要
Abstract The increasing awareness of environmental concerns has prompted a surge in the exploration of lead-free, high-power ceramic capacitors. Ongoing efforts to develop lead-free dielectric ceramics with exceptional energy-storage performance (ESP) have predominantly relied on multi-component composite strategies, often accomplished under ultrahigh electric fields. However, this approach poses challenges in insulation and system downsizing due to the necessary working voltage under such conditions. Despite extensive study, bulk ceramics of (Bi 0.5 Na 0.5 )TiO 3 (BNT), a prominent lead-free dielectric ceramic family, have seldom achieved a recoverable energy-storage (ES) density ( W rec ) exceeding 7 J cm −3 . This study introduces a novel approach to attain ceramic capacitors with high ESP under moderate electric fields by regulating permittivity based on a linear dielectric model, enhancing insulation quality, and engineering domain structures through chemical formula optimization. The incorporation of SrTiO 3 (ST) into the BNT matrix is revealed to reduce the dielectric constant, while the addition of Bi(Mg 2/3 Nb 1/3 )O 3 (BMN) aids in maintaining polarization. Additionally, the study elucidates the methodology to achieve high ESP at moderate electric fields ranging from 300 to 500 kV cm −1 . In our optimized composition, 0.5(Bi 0.5 Na 0.4 K 0.1 )TiO 3 –0.5(2/3ST-1/3BMN) (B-0.5SB) ceramics, we achieved a W rec of 7.19 J cm −3 with an efficiency of 93.8% at 460 kV cm −1 . Impressively, the B-0.5SB ceramics exhibit remarkable thermal stability between 30 and 140 °C under 365 kV cm −1 , maintaining a W rec exceeding 5 J cm −3 . This study not only establishes the B-0.5SB ceramics as promising candidates for ES materials but also demonstrates the feasibility of optimizing ESP by modifying the dielectric constant under specific electric field conditions. Simultaneously, it provides valuable insights for the future design of ceramic capacitors with high ESP under constraints of limited electric field.
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