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Size-dependent fracture of Si nanowire battery anodes

Cited 339 time in Web of Science Cited 365 time in Scopus
Authors

Ryu, IllChoi, Jang Wook; Cui, Yi; Nix, William D.

Issue Date
2011-09
Publisher
Pergamon Press Ltd.
Citation
Journal of the Mechanics and Physics of Solids, Vol.59 No.9, pp.1717-1730
Abstract
We use a unique transmission electron microscope (TEM) technique to show that Si nanowires (NWs) with diameters in the range of a few hundred nanometers can be fully lithiated and delithiated without fracture, in spite of the large volume changes that occur in this process. By analyzing the stresses associated with lithiation and delithiation we conclude that the process does not occur by the growth of discrete crystalline phases; rather it occurs by amorphization of the Si NWs followed by diffusion of Li into the structure. By accounting for the large deformation associated with this process and by including the effects of pressure gradients on the diffusion of Li, we show that Si NWs with diameters less than about 300 nm could not fracture even if pre-existing cracks were present in the NW. These predictions appear to be in good agreement with the experiment. Published by Elsevier Ltd.
ISSN
0022-5096
URI
https://hdl.handle.net/10371/164575
DOI
https://doi.org/10.1016/j.jmps.2011.06.003
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Ryu, Ill류일
조교수
  • College of Engineering
  • Department of Materials Science & Engineering
Research Area Fundamental deformation mechanisms, Optimal desing in nanostructures, Reliability Analysis in Nanostructures

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