High-rate lithium-ion battery anodes based on silicon-coated vertically aligned carbon nanofibers

A multiscale hierarchical lithium-ion battery (LIB) anode composed of Si shells coaxially coated on vertically aligned carbon nanofibers has been explored. A high Li storage capacity of ~3,000-3,500 mAh (g Si ) -1 and > 99% Coulombic efficiency have been obtained. Remarkable stability over 500 ch...

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Bibliographic Details
Main Authors: Klankowski, Steven A., Pandey, Gaind P., Cruden, Brett A., Jianwei Liu, Wu, Judy, Rojeski, Ronald A., Jun Li
Format: Conference Proceeding
Language:English
Subjects:
Anodes
Batteries
Carbon
Nanowires
Silicon
Vacuum technology
Online Access:Request full text
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Summary:A multiscale hierarchical lithium-ion battery (LIB) anode composed of Si shells coaxially coated on vertically aligned carbon nanofibers has been explored. A high Li storage capacity of ~3,000-3,500 mAh (g Si ) -1 and > 99% Coulombic efficiency have been obtained. Remarkable stability over 500 charge-discharge cycles have been demonstrated. Particularly, this electrode present a high-rate capability that the capacity remains within ~7% as the C-rate was increased from ~C/10 to ~8C. Electron microscopy, Raman spectroscopy and electrochemical impedance spectroscopy revealed that the electrode structure remains stable during long cycling. This high-rate property is likely associated with the unique nanocolumnar microstructure of Si in the shell. It reveals an exciting potential to develop high-performance LIBs.
ISSN:1944-9399
1944-9380
DOI:10.1109/NANO.2014.6967967