In Situ Electrochemical Lithiation/Delithiation Observation of Individual Amorphous Si Nanorods
Document Type
Article
Publication Date
9-8-2011
Department
Department of Mechanical Engineering-Engineering Mechanics; Department of Chemistry
Abstract
In situ electrochemical lithiation and delithiation processes inside a nanobattery consisting of an individual amorphous Si nanorod and ionic liquid were explored. Direct formation of the crystalline Li22Si5 phase due to the intercalation of Li ions was observed. In addition, the role of the electrolytenanorod interface was examined. It was observed that the lithiation of Si nanorods is dominated by surface diffusion. Upon the delithiation process, partial decomposition of Li22Si5 ARTICLE particles was observed which can explain the irreversible capacity loss that is generally seen in Si anodes. This study shows that the radial straining due to lithiation does not cause cracking in nanorods as small in diameter as 26 nm, whereas cracks were observed during the lithiation of 55 nm Si nanorods.
Publication Title
ACS Nano
Recommended Citation
Ghassemi, H. M.,
Au, M.,
Chen, N.,
Heiden, P. A.,
&
Yassar, R. S.
(2011).
In Situ Electrochemical Lithiation/Delithiation Observation of Individual Amorphous Si Nanorods.
ACS Nano,
5(10), 7805-7811.
http://doi.org/10.1021/nn2029814
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/15814