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Unveiling the Advances of Nanostructure Design for Alloy‐Type Potassium‐Ion Battery Anodes via In Situ TEM
Author(s) -
Huang Huawen,
Wang Jiuwu,
Yang Xianfeng,
Hu Renzong,
Liu Jinlong,
Zhang Lei,
Zhu Min
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202004193
Subject(s) - materials science , anode , nanostructure , electrospinning , carbon nanofiber , nanotechnology , nanofiber , electrode , alloy , polyacrylonitrile , nanoparticle , in situ , chemical engineering , composite material , carbon nanotube , chemistry , polymer , organic chemistry , engineering
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.