Enabling Superior Electrochemical Properties for Highly Efficient Potassium Storage by Impregnating Ultrafine Sb Nanocrystals within Nanochannel‐Containing Carbon Nanofibers

Sb‐based nanocomposites are attractive anode materials for batteries as they exhibit large theoretical capacity and impressive working voltage. However, tardy potassium ion diffusion characteristics, unstable Sb/electrolyte interphase, and huge volume variation pose a challenge, hindering their prac...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2019-10, Vol.58 (41), p.14578-14583
Main Authors: Ge, Xufang, Liu, Shuhu, Qiao, Man, Du, Yichen, Li, Yafei, Bao, Jianchun, Zhou, Xiaosi
Format: Article
Language:English
Subjects:
Additives
Anodes
Batteries
Binders
Carbon fibers
carbon nanofibers
Crystals
Electrochemical analysis
Electrochemistry
Electrode materials
energy storage
Impregnation
Ion diffusion
Nanochannels
Nanocomposites
Nanocrystals
Nanofibers
Potassium
Potassium channels (voltage-gated)
potassium-ion batteries
Rechargeable batteries
Sb nanocrystals
Ultrafines
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Summary:Sb‐based nanocomposites are attractive anode materials for batteries as they exhibit large theoretical capacity and impressive working voltage. However, tardy potassium ion diffusion characteristics, unstable Sb/electrolyte interphase, and huge volume variation pose a challenge, hindering their practical use for potassium‐ion batteries (PIBs). Now, a simple robust strategy is presented for uniformly impregnating ultrasmall Sb nanocrystals within carbon nanofibers containing an array of hollow nanochannels (denoted u‐Sb@CNFs), resolving the issues above and yielding high‐performance PIBs. u‐Sb@CNFs can be directly employed as an anode, thereby dispensing with the need for conductive additives and binders. Such a judiciously crafted u‐Sb@CNF‐based anode renders a set of intriguing electrochemical properties, representing large charge capacity, unprecedented cycling stability, and outstanding rate performance. A reversible capacity of 225 mAh g−1 is retained after 2000 cycles at 1 A g−1. Superior potassium storage: Sb nanocrystals were uniformly impregnated within carbon nanofibers containing an array of nanochannels (denoted u‐Sb@CNFs). As a freestanding anode for potassium‐ion batteries, u‐Sb@CNFs manifest a large specific capacity, an outstanding rate property, and an ultrastable cycling performance.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201908918