Journal
ELECTROCHIMICA ACTA
Volume 71, Issue -, Pages 194-200Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.03.139
Keywords
Lithium ion batteries; Silicon; Anode materials; Nanorods; Porous
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Funding
- NSF of China [51172024]
- Research Funds for the Central Universities of China
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Ordered porous Si@C nanorods as anode materials for high-performance lithium-ion batteries were prepared via two-step approaches, including magnesiothermic reduction of well-ordered hexagonal mesoporous silica (SBA-15) and impregnating of carbon precursor into the mesoporous Si followed by carbonization. The obtained porous Si@C nanorods demonstrate a reversible specific capacity approaching 627 mAh g(-1) after 220 cycles at a rate of 100 mA g(-1) as well as improved cycling stability and excellent rate capacity. The improved electrochemical performance can be attributed to the fact that the porous interwoven structure of conductive carbon and Si composite can efficiently suppress the volume effect of the Si particles and increase the electronic conductivity. The porous Si@C nanorods exhibit a great potential as anode materials in lithium ion batteries. (C) 2012 Elsevier Ltd. All rights reserved.
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