Huang Huawen, Wang Jiuwu, Yang Xianfeng, Hu Renzong, Liu Jinlong, Zhang Lei, Zhu Min
School of Chemistry & Chemical Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510640, P. R. China.
Analytical and Testing Centre, South China University of Technology, Guangzhou, 510640, P. R. China.
Angew Chem Int Ed Engl. 2020 Aug 17;59(34):14504-14510. doi: 10.1002/anie.202004193. Epub 2020 Jun 9.
Nanostructure design and in situ transmission electron microscopy (TEM) are combined to demonstrate Sb-based nanofibers composed of bunched yolk-shell building units as a significantly improved anode for potassium-ion batteries (PIBs). Particularly, a metal-organic frameworks (MOFs)-engaged electrospinning strategy coupled to a confined ion-exchange followed by a subsequent thermal reduction is proposed to fabricate yolk-shell Sb@C nanoboxes embedded in carbon nanofibers (Sb@CNFs). In situ TEM analysis reveals that the inner Sb nanoparticles undergo a significant volume expansion/contraction during the alloying/dealloying processes, while the void space can effectively relieve the overall volume change, and the plastic carbon shell maintains the structural integrity of electrode material. This work provides an important reference for the application of advanced characterization techniques to guide the optimization of electrode material design.
将纳米结构设计与原位透射电子显微镜（TEM）相结合，证明由成束的蛋黄壳结构单元组成的锑基纳米纤维是一种性能显著提升的钾离子电池（PIB）阳极材料。具体而言，提出了一种基于金属有机框架（MOF）的静电纺丝策略，该策略结合了受限离子交换以及随后的热还原过程，以制备嵌入碳纳米纤维中的蛋黄壳结构Sb@C纳米盒（Sb@CNF）。原位TEM分析表明，内部的锑纳米颗粒在合金化/脱合金化过程中经历了显著的体积膨胀/收缩，而空隙空间可以有效缓解整体体积变化，并且塑性碳壳保持了电极材料的结构完整性。这项工作为应用先进表征技术指导电极材料设计的优化提供了重要参考。
