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Novel multi-layered 1-D nanostructure exhibiting the theoretical capacity of silicon for a super-enhanced lithium-ion battery.

Authors :
Lee BS
Yang HS
Jung H
Jeon SY
Jung C
Kim SW
Bae J
Choong CL
Im J
Chung UI
Park JJ
Yu WR
Source :
Nanoscale [Nanoscale] 2014 Jun 07; Vol. 6 (11), pp. 5989-98. Date of Electronic Publication: 2014 Apr 29.
Publication Year :
2014

Abstract

Silicon/carbon (Si/C) nanocomposites have recently received much attention as Li-ion battery negative electrodes due to their mutual synergetic effects in capacity and mechanical integrity. The contribution of Si to the total capacity of the Si/C nanocomposites determines their structural efficiency. Herein, we report on a multi-layered, one-dimensional nanostructure that exhibits the theoretical specific capacity of Si in the nanocomposite. Concentrically tri-layered, compartmentalized, C-core/Si-medium/C-shell nanofibers were fabricated by triple coaxial electrospinning. The pulverization of Si was accommodated inside the C-shell, whereas the conductive pathway of the Li-ions and electrons was provided by the C-core, which was proven by ex situ Raman spectroscopy. The compartmentalized Si in between the C-core and C-shell led to excellent specific capacity at a high current rate (>820 mA h g(-1) at 12000 mA g(-1)) and the realization of the theoretical specific capacity of the Li15Si4 phase of Si nanoparticles (3627 mA h g(-1)). The electrochemical characterization and inductively coupled plasma-atomic emission spectrometry provided direct evidence of full participation of Si in the electrochemical reactions.

Details

Language :
English
ISSN :
2040-3372
Volume :
6
Issue :
11
Database :
MEDLINE
Journal :
Nanoscale
Publication Type :
Academic Journal
Accession number :
24777437
Full Text :
https://doi.org/10.1039/c4nr00318g