Tape‐Casting Lead‐Free Dielectrics Permit Superior Capacitive Energy Storage Performance

IF 24.4 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Advanced Energy Materials Pub Date : 2024-11-24 DOI:10.1002/aenm.202403535

Fei Yan, Simin Wang, Jin Qian, Zihao Zheng, Long Gu, Jinming Guo, Jiwei Zhai

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Abstract

Dielectric capacitors have garnered significant attention for their promising attributes in advanced pulse power systems of the future, owing to their rapid charge/discharge capabilities, high power density, and remarkable stability. Whereas environmentally friendly lead‐free ceramics are facing serious challenges of low breakdown strength, poor energy storage density, and/or conversion efficiency, which has been an obstacle to developing desirable dielectric capacitors. In this study, high‐quality ultrathin (<20 µm) lead‐free ceramic dielectrics are successfully produced via the tape‐casting method. The local structural characteristics of these ceramics are verified using piezoresponse force microscopy and aberration‐corrected scanning transmission electron microscopy. By introducing Ta5+ ions into Bi0.39Na0.36Sr0.25TiO3 ceramics, the polar clusters tend to decrease together while the maximum applied electric field tends to increase. This phenomenon can be attributed to the decreased grain size and complex polar structure characterized by extremely small polar clusters, enabling the simultaneous achievement of high applied electric field, large polarization, and minimized polarization hysteresis. Notably, the tape‐casted lead‐free ceramics exhibited exceptional comprehensive energy storage performance with a recoverable energy storage density of ≈10.06 J cm−3 and an efficiency of ≈93% under a high electric field of 915 kV cm−1, surpassing the capabilities of most reported lead‐free ceramics. This work offers a viable solution for developing lead‐free ceramic dielectrics with outstanding energy storage capabilities.

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无铅带状电介质可实现卓越的电容储能性能

电介质电容器因其快速充放电能力、高功率密度和出色的稳定性，在未来先进脉冲功率系统中具有广阔的应用前景，因而备受关注。然而，环保的无铅陶瓷却面临着击穿强度低、储能密度低和/或转换效率低的严峻挑战，这一直是开发理想电介质电容器的障碍。在这项研究中，通过胶带铸造法成功生产出了高质量的超薄（20 微米）无铅陶瓷电介质。使用压电响应力显微镜和像差校正扫描透射电子显微镜验证了这些陶瓷的局部结构特征。在 Bi0.39Na0.36Sr0.25TiO3 陶瓷中引入 Ta5+ 离子后，极性簇有一起减少的趋势，而最大外加电场却有增加的趋势。这一现象可归因于晶粒尺寸的减小和极性团簇极小的复杂极性结构，从而能够同时实现高外加电场、大极化和最小极化滞后。值得注意的是，在 915 kV cm-1 的高电场下，胶带浇铸的无铅陶瓷表现出卓越的综合储能性能，其可回收储能密度≈10.06 J cm-3，效率≈93%，超越了大多数已报道的无铅陶瓷的性能。这项工作为开发具有出色储能能力的无铅陶瓷电介质提供了可行的解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Energy Materials CHEMISTRY, PHYSICAL-ENERGY & FUELS

CiteScore

41.90

自引率

4.00%

发文量

889

审稿时长

1.4 months

期刊介绍： Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small. With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics. The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.