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dc.contributor.authorHaro, Marta
dc.contributor.authorSong, Taeseup
dc.contributor.authorGuerrero, Antonio
dc.contributor.authorBertoluzzi, Luca
dc.contributor.authorBisquert, Juan
dc.contributor.authorPaik, Ungyu
dc.contributor.authorGarcia-Belmonte, Germà
dc.date.accessioned2015-06-01T15:13:57Z
dc.date.available2015-06-01T15:13:57Z
dc.date.issued2014
dc.identifier.citationPhys. Chem. Chem. Phys., 2014, 16, 17930ca_CA
dc.identifier.issn1463-9076
dc.identifier.issn1463-9084
dc.identifier.urihttp://hdl.handle.net/10234/122383
dc.description.abstractSi nanotubes for reversible alloying reaction with lithium are able to accommodate large volume changes and offer improved cycle retention and reliable response when incorporated into battery anodes. However, Si nanotubes electrode exhibits poor rate capability because of its inherently low electron conductivity and Li ion diffusivity. Si/Ge double-layered nanotubes electrode show promise to improve structural stability and electrochemical kinetics, as compared to homogeneous Si nanotube arrays. The mechanism explaining the enhancement in the rate capabilities is here revealed by means of electrochemical impedance methods. Ge shell efficiently provides electrons to the active materials which increase the semiconductor conductivity thereby assisting Li+ ion incorporation. The charge transfer resistance which accounts for the interfacial Li+ ion intake from the electrolyte is reduced by two orders of magnitude, implying the key role of Ge layer as electron supplier. Other resistive processes hindering the electrode charge/discharge process are observed to show comparable values for Si and Si/Ge array electrodes.ca_CA
dc.format.extent15 p.ca_CA
dc.format.mimetypeapplication/pdfca_CA
dc.language.isoengca_CA
dc.publisherRoyal Society of Chemistryca_CA
dc.relation.isPartOfPhys. Chem. Chem. Phys., 2014, 16ca_CA
dc.rightsThis journal is © the Owner Societies 2014ca_CA
dc.subjectSemiconductor nanostructuresca_CA
dc.subjectLi-ion batteriesca_CA
dc.subjectElectrochemical kineticsca_CA
dc.subjectRate capabilityca_CA
dc.subjectElectrochemical impedance spectroscopyca_CA
dc.titleGermanium coating boosts lithium uptake in Si nanotube battery anodesca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1039/c4cp02377c
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_CA
dc.relation.publisherVersionhttp://pubs.rsc.org/en/content/articlepdf/2014/cp/c4cp02377c?page=searchca_CA


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