通过成分改性提高 BNT 基陶瓷的储能性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2024-10-04 DOI:10.1016/j.ceramint.2024.09.361

Yangxi Yan , Jiejie Hui , Xiaoying Wang , Dongyan Zhang , Maolin Zhang , Mo Zhao , Meng Wan , Li Jin , Zhimin Li

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引用次数: 0

摘要

无铅陶瓷电容器因其环保特性、高功率密度和快速充放电速率而被广泛应用于脉冲功率系统中。然而，要同时提高可回收能量存储密度（Wrec）和效率（η），仍然具有很大的挑战性。本研究选择了具有宽带隙（∼4 eV）的 Ta2O5 与 Mg2+ 离子复合形成 Ba(Mg1/3Ta2/3)O3 作为基于 BNT 的固溶体的第二相。结合相位调制，在钙化晶体中形成了等势点的成分紊乱，进而诱发电荷紊乱，产生局部随机场。我们采用传统固相法设计并制备了一组二元 (1-x)Bi0.5Na0.5TiO3-xBa(Mg1/3Ta2/3)O3 (BNT-xBMT) 陶瓷。0.80BNT-0.20BMT 陶瓷达到了超高击穿场强 (Eb) 值（245 kV/cm），从而获得了理想的 Wrec 值（3.99 J/cm3）和 η 值（92.0 %）。这些结果为今后设计高性能的高熵陶瓷材料提供了一种新策略。

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Improvement of energy storage properties of BNT-based ceramics via compositional modification

Lead-free ceramic capacitors are extensively utilized in pulsed power systems for their environmentally friendly characteristics, high power density, and fast charging/discharging rate. However, it remains highly challenging to achieve concurrent improvements in both recoverable energy storage density (W_rec) and efficiency (η). In this study, Ta₂O₅ with a wide bandgap (∼4 eV) was chosen in complex with Mg²⁺ ions to form Ba(Mg_1/3Ta_2/3)O₃ as the second phase of a BNT-based solid solution. Combined with phase modulation, a compositional disorder of equipotential sites is formed in chalcogenide crystals, which in turn induces charge disorder generating localized random fields. We have designed and prepared a set of binary (1-x)Bi_0.5Na_0.5TiO₃-xBa(Mg_1/3Ta_2/3)O₃ (BNT-xBMT) ceramics using a conventional solid-phase method. An ultra-high breakdown field strength (E_b) value (245 kV/cm) was attained in 0.80BNT-0.20BMT ceramic, resulting in desirable values of W_rec (3.99 J/cm³) and η (92.0 %). These results offer a new strategy for designing high entropy ceramic materials of high performance in the future.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.