Crystalline-Amorphous Core−Shell Silicon Nanowires for High Capacity and High Current Battery Electrodes

Handle URI:
http://hdl.handle.net/10754/597907
Title:
Crystalline-Amorphous Core−Shell Silicon Nanowires for High Capacity and High Current Battery Electrodes
Authors:
Cui, Li-Feng; Ruffo, Riccardo; Chan, Candace K.; Peng, Hailin; Cui, Yi
Abstract:
Silicon is an attractive alloy-type anode material for lithium ion batteries because of its highest known capacity (4200 mAh/g). However silicon's large volume change upon lithium insertion and extraction, which causes pulverization and capacity fading, has limited its applications. Designing nanoscale hierarchical structures is a novel approach to address the issues associated with the large volume changes. In this letter, we introduce a core-shell design of silicon nanowires for highpower and long-life lithium battery electrodes. Silicon crystalline- amorphous core-shell nanowires were grown directly on stainless steel current collectors by a simple one-step synthesis. Amorphous Si shells instead of crystalline Si cores can be selected to be electrochemically active due to the difference of their lithiation potentials. Therefore, crystalline Si cores function as a stable mechanical support and an efficient electrical conducting pathway while amorphous shells store Li ions. We demonstrate here that these core-shell nanowires have high charge storage capacity (̃1000 mAh/g, 3 times of carbon) with ̃90% capacity retention over 100 cycles. They also show excellent electrochemical performance at high rate charging and discharging (6.8 A/g, ̃20 times of carbon at 1 h rate). © 2009 American Chemical Society.
Citation:
Cui L-F, Ruffo R, Chan CK, Peng H, Cui Y (2009) Crystalline-Amorphous Core−Shell Silicon Nanowires for High Capacity and High Current Battery Electrodes. Nano Lett 9: 491–495. Available: http://dx.doi.org/10.1021/nl8036323.
Publisher:
American Chemical Society (ACS)
Journal:
Nano Letters
Issue Date:
14-Jan-2009
DOI:
10.1021/nl8036323
PubMed ID:
19105648
Type:
Article
ISSN:
1530-6984; 1530-6992
Sponsors:
Y.C. acknowledges support from the Global Climate and Energy Project at Stanford, U.S. Office of Naval Research and King Abdullah University of Science and Technology. C.K.C. acknowledges support from a National Science Foundation graduate fellowship and Stanford Graduate Fellowship.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorCui, Li-Fengen
dc.contributor.authorRuffo, Riccardoen
dc.contributor.authorChan, Candace K.en
dc.contributor.authorPeng, Hailinen
dc.contributor.authorCui, Yien
dc.date.accessioned2016-02-25T12:58:41Zen
dc.date.available2016-02-25T12:58:41Zen
dc.date.issued2009-01-14en
dc.identifier.citationCui L-F, Ruffo R, Chan CK, Peng H, Cui Y (2009) Crystalline-Amorphous Core−Shell Silicon Nanowires for High Capacity and High Current Battery Electrodes. Nano Lett 9: 491–495. Available: http://dx.doi.org/10.1021/nl8036323.en
dc.identifier.issn1530-6984en
dc.identifier.issn1530-6992en
dc.identifier.pmid19105648en
dc.identifier.doi10.1021/nl8036323en
dc.identifier.urihttp://hdl.handle.net/10754/597907en
dc.description.abstractSilicon is an attractive alloy-type anode material for lithium ion batteries because of its highest known capacity (4200 mAh/g). However silicon's large volume change upon lithium insertion and extraction, which causes pulverization and capacity fading, has limited its applications. Designing nanoscale hierarchical structures is a novel approach to address the issues associated with the large volume changes. In this letter, we introduce a core-shell design of silicon nanowires for highpower and long-life lithium battery electrodes. Silicon crystalline- amorphous core-shell nanowires were grown directly on stainless steel current collectors by a simple one-step synthesis. Amorphous Si shells instead of crystalline Si cores can be selected to be electrochemically active due to the difference of their lithiation potentials. Therefore, crystalline Si cores function as a stable mechanical support and an efficient electrical conducting pathway while amorphous shells store Li ions. We demonstrate here that these core-shell nanowires have high charge storage capacity (̃1000 mAh/g, 3 times of carbon) with ̃90% capacity retention over 100 cycles. They also show excellent electrochemical performance at high rate charging and discharging (6.8 A/g, ̃20 times of carbon at 1 h rate). © 2009 American Chemical Society.en
dc.description.sponsorshipY.C. acknowledges support from the Global Climate and Energy Project at Stanford, U.S. Office of Naval Research and King Abdullah University of Science and Technology. C.K.C. acknowledges support from a National Science Foundation graduate fellowship and Stanford Graduate Fellowship.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleCrystalline-Amorphous Core−Shell Silicon Nanowires for High Capacity and High Current Battery Electrodesen
dc.typeArticleen
dc.identifier.journalNano Lettersen
dc.contributor.institutionStanford University, Palo Alto, United Statesen
dc.contributor.institutionUniversita degli Studi di Milano - Bicocca, Milan, Italyen

Related articles on PubMed

All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.