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Unveiling Intrinsic Potassium Storage Behaviors of Hierarchical Nano Bi@N‐Doped Carbon Nanocages Framework via In Situ Characterizations

2020; Wiley; Volume: 60; Issue: 13 Linguagem: Inglês

10.1002/anie.202016082

1521-3773

Zehang Sun, Yang Liu, Weibin Ye, Jinyang Zhang, Yuyan Wang, Yue Lin, Linrui Hou, Ming‐Sheng Wang, Changzhou Yuan,

Advanced battery technologies research

Abstract 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.