期刊
ELECTROCHIMICA ACTA
卷 85, 期 -, 页码 680-684出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.08.054
关键词
Carbon nanotubes; Silicon anode; Lithium ion; Battery; Heterostructures
资金
- US Department of Energy's Office of Vehicle Technologies BATT program [DE-AC02-05CHI1231]
- Ford Motor Company
- National Science Foundation [CBET-0933141]
- Edward R. Weidlein Chair Professorship Funds
- Center for Complex Engineered Multifunctional Materials (CCEMM) at the University of Pittsburgh
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0933141] Funding Source: National Science Foundation
Heterostructures of vertically aligned carbon nanotubes (CNTs) and nanostructured silicon were synthesized on quartz substrates using a simple 2 step liquid injection chemical vapor deposition (CVD) approach. The CVD conditions and the process parameters were modified to engineer droplets and thin film morphologies of silicon on the CNTs. The combined influence of these Si morphologies on the electrochemical performance was then studied. Structural analyses conducted on the heterostructures using XRD and Raman spectroscopy indicated the existence of nanocrystalline and amorphous phases of silicon. Cycling performance of these heterostructures exhibit very high specific discharge capacities in excess of 2300 mAh/g accompanied by a low irreversible loss (10%) for a loading density of similar to 2-3 mg/cm(2) demonstrating the use of these heterostructures as next generation lithium-ion anodes. (C) 2012 Elsevier Ltd. All rights reserved.
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