Germanium coating boosts lithium uptake in Si nanotube battery anodes
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Other documents of the author: Haro, Marta; Song, Taeseup; Guerrero, Antonio; Bertoluzzi, Luca; Bisquert, Juan; Paik, Ungyu; Garcia-Belmonte, Germà
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Germanium coating boosts lithium uptake in Si nanotube battery anodesAuthor (s)
Date
2014Publisher
Royal Society of ChemistryISSN
1463-9076; 1463-9084Bibliographic citation
Phys. Chem. Chem. Phys., 2014, 16, 17930Type
info:eu-repo/semantics/articlePublisher version
http://pubs.rsc.org/en/content/articlepdf/2014/cp/c4cp02377c?page=searchVersion
info:eu-repo/semantics/acceptedVersionSubject
Abstract
Si 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 ... [+]
Si 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. [-]
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