Enabling Superior Electrochemical Properties for Highly Efficient Potassium Storage by Impregnating Ultrafine Sb Nanocrystals within Nanochannel-Containing Carbon Nanofibers
Ge, XF (Ge, Xufang)[ 1 ] ; Liu, SH (Liu, Shuhu)[ 2 ] ; Qiao, M (Qiao, Man)[ 1 ] ; Du, YC (Du, Yichen)[ 1 ] ; Li, YF (Li, Yafei)[ 1 ] ; Bao, JC (Bao, Jianchun)[ 1 ] ; Zhou, XS (Zhou, Xiaosi)[ 1 ]*（周小四）

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION，201910,58(41), 14578-14583

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).

文章链接：
https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201908918

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