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Size-dependent fracture of Si nanowire battery anodes

Cited 251 time in Web of Science Cited 263 time in Scopus
Authors
Ryu, Ill; Choi, Jang Wook; Cui, Yi; Nix, William D.
Issue Date
2011-09
Citation
Journal of the Mechanics and Physics of Solids, Vol.59 No.9, pp.1717-1730
Keywords
Lithiation/delithiationLarge deformationFractureStrain energy release rateCritical size
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
http://hdl.handle.net/10371/164575
DOI
https://doi.org/10.1016/j.jmps.2011.06.003
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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