Structural and electrochemical study of the reaction of lithium with silicon nanowires

Handle URI:
http://hdl.handle.net/10754/599752
Title:
Structural and electrochemical study of the reaction of lithium with silicon nanowires
Authors:
Chan, Candace K.; Ruffo, Riccardo; Hong, Seung Sae; Huggins, Robert A.; Cui, Yi
Abstract:
The structural transformations of silicon nanowires when cycled against lithium were evaluated using electrochemical potential spectroscopy and galvanostatic cycling. During the charge, the nanowires alloy with lithium to form an amorphous LixSi compound. At potentials <50 mV, a structural transformation occurs. In studies on micron-sized particles previously reported in the literature, this transformation is a crystallization to a metastable Li15Si4 phase. X-ray diffraction measurements on the Si nanowires, however, show that they are amorphous, suggesting that a different amorphous phase (LiySi) is formed. Lithium is removed from this phase in the discharge to form amorphous silicon. We have found that limiting the voltage in the charge to 70 mV results in improved efficiency and cyclability compared to charging to 10 mV. This improvement is due to the suppression of the transformation at low potentials, which alloys for reversible cycling of amorphous silicon nanowires. © 2008 Elsevier B.V. All rights reserved.
Citation:
Chan CK, Ruffo R, Hong SS, Huggins RA, Cui Y (2009) Structural and electrochemical study of the reaction of lithium with silicon nanowires. Journal of Power Sources 189: 34–39. Available: http://dx.doi.org/10.1016/j.jpowsour.2008.12.047.
Publisher:
Elsevier BV
Journal:
Journal of Power Sources
Issue Date:
Apr-2009
DOI:
10.1016/j.jpowsour.2008.12.047
Type:
Article
ISSN:
0378-7753
Sponsors:
C.K.C. acknowledges support from a National Science Foundation graduate fellowship and Stanford Graduate Fellowship. Y.C. acknowledges support from the Global Climate and Energy Project at Stanford, US Office of Naval Research and King Abdullah University of Science and Technology.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorChan, Candace K.en
dc.contributor.authorRuffo, Riccardoen
dc.contributor.authorHong, Seung Saeen
dc.contributor.authorHuggins, Robert A.en
dc.contributor.authorCui, Yien
dc.date.accessioned2016-02-28T06:08:59Zen
dc.date.available2016-02-28T06:08:59Zen
dc.date.issued2009-04en
dc.identifier.citationChan CK, Ruffo R, Hong SS, Huggins RA, Cui Y (2009) Structural and electrochemical study of the reaction of lithium with silicon nanowires. Journal of Power Sources 189: 34–39. Available: http://dx.doi.org/10.1016/j.jpowsour.2008.12.047.en
dc.identifier.issn0378-7753en
dc.identifier.doi10.1016/j.jpowsour.2008.12.047en
dc.identifier.urihttp://hdl.handle.net/10754/599752en
dc.description.abstractThe structural transformations of silicon nanowires when cycled against lithium were evaluated using electrochemical potential spectroscopy and galvanostatic cycling. During the charge, the nanowires alloy with lithium to form an amorphous LixSi compound. At potentials <50 mV, a structural transformation occurs. In studies on micron-sized particles previously reported in the literature, this transformation is a crystallization to a metastable Li15Si4 phase. X-ray diffraction measurements on the Si nanowires, however, show that they are amorphous, suggesting that a different amorphous phase (LiySi) is formed. Lithium is removed from this phase in the discharge to form amorphous silicon. We have found that limiting the voltage in the charge to 70 mV results in improved efficiency and cyclability compared to charging to 10 mV. This improvement is due to the suppression of the transformation at low potentials, which alloys for reversible cycling of amorphous silicon nanowires. © 2008 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipC.K.C. acknowledges support from a National Science Foundation graduate fellowship and Stanford Graduate Fellowship. Y.C. acknowledges support from the Global Climate and Energy Project at Stanford, US Office of Naval Research and King Abdullah University of Science and Technology.en
dc.publisherElsevier BVen
dc.subjectAnodeen
dc.subjectLithium-ion batteryen
dc.subjectPhase transformationen
dc.subjectSilicon nanowireen
dc.titleStructural and electrochemical study of the reaction of lithium with silicon nanowiresen
dc.typeArticleen
dc.identifier.journalJournal of Power Sourcesen
dc.contributor.institutionStanford University, Palo Alto, United Statesen
dc.contributor.institutionUniversita degli Studi di Milano - Bicocca, Milan, Italyen
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