Lithiation Behavior of Coaxial Hollow Nanocables of Carbon–Silicon Composite

A design of coaxial hollow nanocables of carbon nanotubes and silicon composite (CNTs@Silicon) was presented, and the lithiation/delithiation behavior was investigated. The FIB-SEM studies demonstrated hollow structured silicon tends to expand inward and shrink outward during lithiation/delithiation...

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Bibliographic Details
Published in:ACS nano 2019-02, Vol.13 (2), p.2274-2280, Article acsnano.8b08962
Main Authors: Ma, Tianyi, Xu, Hanying, Yu, Xiangnan, Li, Huiyu, Zhang, Wenguang, Cheng, Xiaolu, Zhu, Wentao, Qiu, Xinping
Format: Article
Language:English
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Summary:A design of coaxial hollow nanocables of carbon nanotubes and silicon composite (CNTs@Silicon) was presented, and the lithiation/delithiation behavior was investigated. The FIB-SEM studies demonstrated hollow structured silicon tends to expand inward and shrink outward during lithiation/delithiation, which reveal the mechanism of inhibitive effect of the excessive growth of solid–electrolyte interface by hollow structured silicon. The as-prepared coaxial hollow nanocables demonstrate an impressive reversible specific capacity of 1150 mAh g–1 over 500 cycles, giving an average Coulombic efficiency of >99.9%. The electrochemical impedance spectroscopy and differential scanning calorimetry confirmed the SEI film excessive growth is prevented.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.8b08962