Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 529, Issue -, Pages 55-61Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.08.060
Keywords
Microstructure; Fracture; Nanocomposites; Anodes
Categories
Funding
- European Research Council [MINATRAN 211166]
Ask authors/readers for more resources
Sn/C nanocomposites, in the form of Sn or SnO2 islands attached on carbon surfaces, provide a high initial capacity when used as anodes in rechargeable Li-ion batteries. Upon Li-insertion, however, the Sn undergoes significant volume changes which result in fracture and, hence, a fade in capacity. In the present study a detailed electron microscopy analysis was used for the first time to document the fracture that occurred throughout the Li-insertion and de-insertion process. Particularly, scanning and transmission (SEM&TEM) electron microscopy was performed on four different Sn/C nanocomposites, before and after, electrochemical cycling. Analysis of the Sn particle size distribution showed that the greatest amount of fracture occurred during the first cycle. It was concluded that both the particle volume average and the area fraction of the as prepared Sn or SnO2 islands must be kept at low values in order to minimize fracture and, therefore, retain a stable capacity. A simple empirical expression was, hence, presented to relate the capacity with the initial microstructure. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available