Stress delocalization by grain boundaries densified in microsized alloying particles for advanced sodium storage

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2024-11-14 DOI:10.1016/j.actamat.2024.120570

Chunyi Xu , Song Sun , Jinhui Zhao , Xin Zhang , Xiaolei Feng , Simon A.T. Redfern , Chaoqun Xia , Huiyang Gou , Gongkai Wang

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Abstract

Microsized alloying anodes are the next practical step in achieving advanced batteries with higher energy density, yet the major challenge, associated with their alloying processing, lies in electro-mechanical failure phenomena caused by stress concentration. Here, we develop a universal grain boundaries (GBs) strategy on microsized alloying anodes for sodium ion batteries. The densified GBs function as fast diffusion paths to promote more homogenous sodiation. They facilitate consistent sodiation kinetics by stress transportation and delocalization, leading to electrochemical attributes superior to reported nanosized anodes (microsized Bi as a model, 200.5 mAh/[email protected], 1043.1 mAh/cm³@40C, high tap density of ∼2.4 g/cm³). Furthermore, GBs also act as dislocation catchers and barriers, significantly altering the sodiation behavior and subsequent structural evolution, and giving rise to enhanced fracture resistance and cycling stability. This work provides the key insight into GB-associated effects in microsized anodes on electro-mechanical coupling process, essential for development of advanced batteries.

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用于高级钠储存的微小合金颗粒中致密化的晶界应力分散

微合金化阳极是实现能量密度更高的先进电池的下一个实际步骤，但其合金化加工的主要挑战在于应力集中导致的电动力学失效现象。在此，我们为钠离子电池的微尺寸合金阳极开发了一种通用晶界（GBs）策略。致密化的 GB 具有快速扩散路径的功能，可促进更均匀的钠化。它们通过应力传输和分散促进了一致的阳极氧化动力学，使其电化学特性优于已报道的纳米阳极（以微小铋为模型，200.5 mAh/g@277.5C，1043.1 mAh/cm3@40C，高锥密度 ∼ 2.4 g/cm3）。此外，GB 还充当位错捕捉器和屏障，显著改变了钠化行为和随后的结构演变，并增强了抗断裂性和循环稳定性。这项研究为深入了解微尺寸阳极中的 GB 对机电耦合过程的相关影响提供了重要依据，这对先进电池的开发至关重要。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.