期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 28, 期 -, 页码 40-43出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.11.032
关键词
Silicon anodes; Silicon-carbon nanocomposites; Lithium ion battery
资金
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001086]
- ACS Division of Analytical Chemistry
- Eastman Chemical Co.
- NSF [DMR-1120296]
As an anode material for lithium-ion batteries (LIBs), silicon offers among the highest theoretical storage capacity, but is known to suffer from large structural changes and capacity fading during electrochemical cycling. Nanocomposites of silicon with carbon provide a potential material platform for resolving this problem. We report a spray-pyrolysis approach for synthesizing amorphous silicon-carbon nanocomposites from organic silane precursors. Elemental mapping shows that the amorphous silicon is uniformly dispersed in the carbon matrix. When evaluated as anode materials in LIBs, the materials exhibit highly, stable performance and excellent Coulombic efficiency for more than 150 charge discharge cycles at a charging rate of 1 A/g. Post-mortem analysis indicates that the structure of the Si-C composite is retained after extended electrochemical cycling, confirming the hypothesis that better mechanical buffering is obtained when amorphous Si is embedded in a carbon matrix. (C) 2012 Elsevier B.V. All rights reserved.
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