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Unveiling the Advances of Nanostructure Design for Alloy-Type Potassium-Ion Battery Anodes via In Situ TEM |
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| Authors: | Huawen Huang Jiuwu Wang Prof Xianfeng Yang Prof Renzong Hu Dr Jinlong Liu Prof Lei Zhang Prof Min Zhu |
| Institution: | 1. School of Chemistry & Chemical Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510640 P. R. China
These authors contributed equally to this work.;2. Analytical and Testing Centre, South China University of Technology, Guangzhou, 510640 P. R. China;3. School of Materials Science and Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510640 P. R. China;4. Department of Engineering, University of Cambridge, Cambridge, CB3 0FA UK;5. School of Chemistry & Chemical Engineering, Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510640 P. R. China |
| Abstract: | 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. |
| Keywords: | antimony in situ TEM metal–organic frameworks nanostructure design potassium-ion batteries |