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High Performance Lithium-ion Battery Electrode: Silicon Coated on Vertically Aligned Carbon Nanofibers

Published online by Cambridge University Press:  12 June 2013

Steven Klankowski ,
Ronald Rojeski  and
Jun Li
Steven Klankowski
Affiliation:
Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA.
Ronald Rojeski
Affiliation:
Catalyst Power Technologies, 200 Carlyn Avenue, Suite C, Campbell, CA 95008, USA.
Jun Li
Affiliation:
Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA.
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Abstract

This study reports a high-performance hybrid lithium-ion anode material using coaxially coated silicon shells on vertically aligned carbon nanofiber (VACNF) cores. The robust bush-like highly conductive VACNFs effectively connect high-capacity silicon shells for lithium-ion storage. Such architecture allows the Si shells to freely expand/contract in the radial direction during lithium-ion insertion/extraction. A high specific capacity of 3000-3650 mAh(gSi)-1 was obtained at C/1 rate, comparable to the maximum value of amorphous Si, and ∼89% of the capacity was retained after 100 charge-discharge cycles. The lithium-ion storage capacity remains nearly the same from C/10 to C/0.5 rates. The ability to obtain high capacity at significantly improved power rates while maintaining the extraordinary cycle stability demonstrates the utilization of the unique properties of such hybrid architecture for lithium-ion batteries.

Keywords

energy storagenanostructureLi
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1541: Symposium F – Materials for Vehicular and Grid Energy Storage , 2013 , mrss13-1541-f09-14
Copyright
Copyright © Materials Research Society 2013 

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References

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