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    In Situ X-ray Diffraction Studies of (De)lithiation Mechanism in Silicon Nanowire Anodes

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    Type
    Article
    Authors
    Misra, Sumohan
    Liu, Nian
    Nelson, Johanna
    Hong, Seung Sae
    Cui, Yi cc
    Toney, Michael F.
    KAUST Grant Number
    KUS-I1-001-12
    Date
    2012-05-10
    Online Publication Date
    2012-05-10
    Print Publication Date
    2012-06-26
    Permanent link to this record
    http://hdl.handle.net/10754/598599
    
    Metadata
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    Abstract
    Figure Persented: Silicon is a promising anode material for Li-ion batteries due to its high theoretical specific capacity. From previous work, silicon nanowires (SiNWs) are known to undergo amorphorization during lithiation, and no crystalline Li-Si product has been observed. In this work, we use an X-ray transparent battery cell to perform in situ synchrotron X-ray diffraction on SiNWs in real time during electrochemical cycling. At deep lithiation voltages the known metastable Li 15Si 4 phase forms, and we show that avoiding the formation of this phase, by modifying the SiNW growth temperature, improves the cycling performance of SiNW anodes. Our results provide insight on the (de)lithiation mechanism and a correlation between phase evolution and electrochemical performance for SiNW anodes. © 2012 American Chemical Society.
    Citation
    Misra S, Liu N, Nelson J, Hong SS, Cui Y, et al. (2012) In Situ X-ray Diffraction Studies of (De)lithiation Mechanism in Silicon Nanowire Anodes . ACS Nano 6: 5465–5473. Available: http://dx.doi.org/10.1021/nn301339g.
    Sponsors
    We thank F. U. Renner for his valuable comments. Portions of this research were carried out at the Stanford Synchrotron Radiation Lightsource, a national user facility operated by Stanford University on behalf of the U.S. Department of Energy, Office of Basic Energy Sciences. This work is supported by the Department of Energy, Laboratory Directed Research and Development funding, under contract DE-AC02-76SF00515 (J.N., M.F.T., Y.C.). Y.C. acknowledges support from the King Abdullah University of Science and Technology (KAUST) Investigator Award (No. KUS-I1-001-12).
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Nano
    DOI
    10.1021/nn301339g
    PubMed ID
    22558938
    ae974a485f413a2113503eed53cd6c53
    10.1021/nn301339g
    Scopus Count
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