Yingjun Qiao , Yuxin Hu , Zhiqiang Qian , Meizhen Qu , Zhong Liu
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By controlling the spray drying parameters and the size of the MOF, we achieved a controllable adjustment of cavity size and shell integrity without the need for sacrificial templates, facilitating large-scale preparation. Electrochemical characterization shows that the composites exhibit impressive performance, achieving a reversible specific capacity of 1,054.5 mAh g<sup>−1</sup> after 100 cycles at 0.5 A g<sup>−1</sup>, and retaining 734.8 mAh g<sup>−1</sup> after 400 cycles at 1 A g<sup>−1</sup>. Moreover, finite element analysis (FEA) revealed another reason why the yolk-shell structure improves the performance of Si anodes: the presence of cavities promotes ion diffusion processes. 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引用次数: 0
摘要
蛋黄壳结构为锂离子电池(lib)中硅(Si)阳极的挑战提供了一个有希望的解决方案,特别是在解决充放电循环过程中发生的显著体积变化方面。然而,传统的施工方法往往依赖于牺牲模板和酸或碱蚀刻,这限制了工业适用性。在这项工作中,我们利用可扩展喷雾干燥技术和金属有机框架(MOFs)在室温下原位生长,成功构建了具有多核壳壳结构的硅/碳(Si/C)复合材料。通过控制喷雾干燥参数和MOF的尺寸,我们在不牺牲模板的情况下实现了空腔尺寸和外壳完整性的可控调节,便于大规模制备。电化学表征表明,复合材料表现出令人印象深刻的性能,在0.5 a g-1下循环100次后达到1,054.5 mAh g-1的可逆比容量,在1 a g-1下循环400次后保持734.8 mAh g-1。此外,有限元分析(FEA)揭示了蛋黄壳结构提高硅阳极性能的另一个原因:空腔的存在促进了离子扩散过程。本研究为制备具有卵黄壳结构的Si-C复合材料提供了新的合成范式,并对该结构的改进机理提供了新的见解。
An innovative strategy for constructing multicore yolk-shell Si/C anodes for lithium-ion batteries
The yolk-shell architecture offers a promising solution to the challenges of silicon (Si) anodes in lithium-ion batteries (LIBs), particularly in addressing the significant volume changes that occur during charge and discharge cycles. However, traditional construction methods often rely on sacrificial templates and acid or alkali etching, which limits industrial applicability. In this work, we successfully constructed a silicon/carbon (Si/C) composite with a multicore yolk-shell structure using scalable spray drying technology and in-situ growth of metal–organic frameworks (MOFs) at room temperature. By controlling the spray drying parameters and the size of the MOF, we achieved a controllable adjustment of cavity size and shell integrity without the need for sacrificial templates, facilitating large-scale preparation. Electrochemical characterization shows that the composites exhibit impressive performance, achieving a reversible specific capacity of 1,054.5 mAh g−1 after 100 cycles at 0.5 A g−1, and retaining 734.8 mAh g−1 after 400 cycles at 1 A g−1. Moreover, finite element analysis (FEA) revealed another reason why the yolk-shell structure improves the performance of Si anodes: the presence of cavities promotes ion diffusion processes. This study provides a new synthetic paradigm for preparing Si-C composite materials with yolk shell structure and offers new insights into the improvement mechanism of this structure.
期刊介绍:
The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality.
Emphasis:
The journal emphasizes fundamental scientific innovation within the following categories:
A.Colloidal Materials and Nanomaterials
B.Soft Colloidal and Self-Assembly Systems
C.Adsorption, Catalysis, and Electrochemistry
D.Interfacial Processes, Capillarity, and Wetting
E.Biomaterials and Nanomedicine
F.Energy Conversion and Storage, and Environmental Technologies