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Enabling Superior Electrochemical Properties for Highly Efficient Potassium Storage by Impregnating Ultrafine Sb Nanocrystals within Nanochannel‐Containing Carbon Nanofibers
Author(s) -
Ge Xufang,
Liu Shuhu,
Qiao Man,
Du Yichen,
Li Yafei,
Bao Jianchun,
Zhou Xiaosi
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201908918
Subject(s) - anode , materials science , electrochemistry , electrolyte , nanocrystal , carbon nanofiber , carbon fibers , nanocomposite , chemical engineering , nanofiber , nanotechnology , potassium , carbon nanotube , composite material , electrode , chemistry , composite number , metallurgy , engineering
Abstract 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 .