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Unveiling Intrinsic Potassium Storage Behaviors of Hierarchical Nano Bi@N‐Doped Carbon Nanocages Framework via In Situ Characterizations
Author(s) -
Sun Zehang,
Liu Yang,
Ye Weibin,
Zhang Jinyang,
Wang Yuyan,
Lin Yue,
Hou Linrui,
Wang MingSheng,
Yuan Changzhou
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202016082
Subject(s) - nanocages , anode , materials science , bismuth , chemical engineering , annealing (glass) , metal organic framework , nanotechnology , electrode , composite material , adsorption , metallurgy , chemistry , catalysis , biochemistry , engineering
Metallic bismuth has drawn attention as a promising alloying anode for advanced potassium ion batteries (PIBs). However, serious volume expansion/electrode pulverization and sluggish kinetics always lead to its inferior cycling and rate properties for practical applications. Therefore, advanced Bi‐based anodes via structural/compositional optimization and sur‐/interface design are needed. Herein, we develop a bottom‐up avenue to fabricate nanoscale Bi encapsulated in a 3D N‐doped carbon nanocages (Bi@N‐CNCs) framework with a void space by using a novel Bi‐based metal‐organic framework as the precursor. With elaborate regulation in annealing temperatures, the optimized Bi@N‐CNCs electrode exhibits large reversible capacities and long‐duration cyclic stability at high rates when evaluated as competitive anodes for PIBs. Insights into the intrinsic K + ‐storage processes of the Bi@N‐CNCs anode are put forward from comprehensive in situ characterizations.