2D Bismuth@N‐Doped Carbon Sheets for Ultrahigh Rate and Stable Potassium Storage

Metallic Bi, as an alloying‐type anode material, has demonstrated tremendous potential for practical application of potassium‐ion batteries. However, the giant volume expansion, severe structure pulverization, and sluggish dynamics of Bi‐based materials result in unsatisfied rate performance and uns...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2022-11, Vol.18 (44), p.e2203976-n/a
Main Authors: Xu, Anding, Zhu, Qi, Li, Guilan, Gong, Caihong, Li, Xue, Chen, Huaming, Cui, Jie, Wu, Songping, Xu, Zhiguang, Yan, Yurong
Format: Article
Language:English
Subjects:
Alloying
Anodes
Bismuth
bismuth sheets
Carbon
Cycles
Density functional theory
Electrode materials
Energy storage
Nanotechnology
N‐doping carbons
Photoelectrons
Potassium
potassium ion batteries
Rechargeable batteries
Sheets
Stability
Structural integrity
ultrahigh rate
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Summary:Metallic Bi, as an alloying‐type anode material, has demonstrated tremendous potential for practical application of potassium‐ion batteries. However, the giant volume expansion, severe structure pulverization, and sluggish dynamics of Bi‐based materials result in unsatisfied rate performance and unstable cycling stability. Here, 2D bismuth@N‐doped carbon sheets with BiOC bond and internal void space (2D Bi@NOC) are successfully fabricated via a self‐template strategy to address these issues, which own ultrafast electrochemical kinetics and impressive long‐term cycling stability for delivering an admirable capacity of 341.7 mAh g−1 after 1000 cycles at 10 A g−1 and impressive rate capability of 220.6 mAh g−1 at 50 A g−1. Particularly, the in situ transmission electron microscopy observations visualize the real‐time alloying/dealloying process and reveal that plastic carbon shell and void space can availably relieve dramatic volume stress and powerfully maintain structural integrity. Density functional theory calculation and ultraviolet photoelectron spectroscopy test certify that the robust BiOC bond is thermodynamically and kinetically beneficial for adsorption/diffusion of K+. This work will light on designing advanced high‐performance energy materials and provide important evidence for understanding the energy storage mechanism of alloy‐based materials. 2D bismuth@N‐doped carbon sheets with powerful BiOC bond and an internal void space via a self‐template strategy are successfully fabricated for achieving ultrahigh rate and stable potassium‐ion storage. The interface microstructure and chemical coupling and their influence on the electrochemical properties are clearly revealed by ex/in situ techniques and density functional theory calculation.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202203976