Synergistic Vacancy and Amorphization Engineering in BiOCl Heterostructures Enable Ultrafast Potassium‐Ion Storage

IF 18.5 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Functional Materials Pub Date : 2025-07-14 DOI:10.1002/adfm.202513591

Fanglan Mo, Zhiwang Liu, Hongyan Li

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引用次数: 0

Abstract

Slow diffusion kinetics and structural stability have hindered the development of anode materials employed in potassium ion batteries. In this work, the oxygen vacancy (OV) concentration in BiOCl is modulated by varying the solvothermal time to improve the anode material properties. Specifically, OV‐rich BiOCl synthesized with a reaction time of 10 hours (BiOCl‐10 h) exhibit expanded interlayer spacing and the presence of amorphous regions. These structural features synergistically improve both electron/ion transport kinetics and electrode stability. Ex situ transmission electron microscopy and in situ X‐ray diffraction reveal a dual reaction mechanism: an irreversible conversion of BiOCl to Bi, followed by a reversible Bi‐K alloying process. This unique structural configuration effectively disperses the K insertion‐induced stresses and promotes the formation of Bi intermediates for sustained alloying reactions, achieving a high initial Coulombic efficiency (78.2%). Remarkably, BiOCl‐10 h delivers 285.2 mAh g−1 at 50 A g−1 while maintaining 82.5% versus 1 A g−1, exhibiting notable high‐rate behavior compared to recently reported works. Long‐term cycle at 20 A g−1 retains 205 mAh g−1 after 1500 cycles, highlighting structural robustness. Practical application is demonstrated through a fully battery‐powered LED screen and continuous light emission from light strips. This research provides novel concepts for the study of layered anode materials.

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生物ocl异质结构中的协同空位和非晶化工程实现了超快钾离子存储

缓慢的扩散动力学和结构稳定性阻碍了钾离子电池负极材料的发展。在本研究中，通过改变溶剂热时间来调节BiOCl中的氧空位（OV）浓度，以改善阳极材料的性能。具体来说，反应时间为10小时的富OV - BiOCl （BiOCl - 10小时）表现出层间间距扩大和无定形区域的存在。这些结构特征协同提高了电子/离子传输动力学和电极稳定性。非原位透射电子显微镜和原位X射线衍射揭示了双反应机制：BiOCl不可逆转化为Bi，随后是可逆的Bi - K合金化过程。这种独特的结构构型有效地分散了K插入引起的应力，促进了Bi中间体的形成，从而实现了高的初始库仑效率（78.2%）。值得注意的是，BiOCl‐10 h在50 A g−1下可提供285.2 mAh g−1，同时保持82.5%，而不是1 A g−1，与最近报道的工作相比，表现出显著的高倍率行为。在20 A g−1的长期循环下，1500次循环后保持205 mAh g−1，突出了结构的坚固性。实际应用是通过一个完全由电池供电的LED屏幕和连续发光条来演示的。本研究为层状阳极材料的研究提供了新的思路。

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 Functional Materials 工程技术-材料科学：综合

CiteScore

29.50

自引率

4.20%

发文量

2086

审稿时长

2.1 months

期刊介绍： Firmly established as a top-tier materials science journal, Advanced Functional Materials reports breakthrough research in all aspects of materials science, including nanotechnology, chemistry, physics, and biology every week. Advanced Functional Materials is known for its rapid and fair peer review, quality content, and high impact, making it the first choice of the international materials science community.