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dc.contributor.authorMiao, Jinghui
dc.contributor.authorWang, Baoming
dc.contributor.authorThompson, Carl Vernette
dc.date.accessioned2020-09-14T15:27:39Z
dc.date.available2020-09-14T15:27:39Z
dc.date.issued2020-07
dc.date.submitted2020-06
dc.identifier.issn0013-4651
dc.identifier.urihttps://hdl.handle.net/1721.1/127253
dc.description.abstractMechanisms of the reversible lithiation of amorphous germanium thin films were studied using electrochemical and structural characterization techniques. Cyclic voltammograms (CV) exhibited major lithiation peaks and delithiation peaks, the latter of which turned out to be highly dependent on the lithiation cutoff voltage and closely associated with the formation of the crystalline phase c-Li15Ge4. Through detailed analyses of CV and potentiostatic tests we demonstrate that the features of electrochemically induced phase transitions vary with lithiation voltage. A surprising finding is that two phase transitions occur simultaneously in the 0.29-0.14 V range. In this regime, three phases, two amorphous phases with different stoichiometries and the crystalline phase, can co-exist. The cycle-number dependence of formation of the crystalline phase as well as structural analyses suggest that crack formation may play an important role in reducing the kinetic barrier associated with crystallization. This study sheds new light on the kinetic constraints on lithiation of a-Ge and yields insight for electrode design and development of cycling schemes for optimized performance and cyclability.en_US
dc.language.isoen
dc.publisherThe Electrochemical Societyen_US
dc.relation.isversionof10.1149/1945-7111/ab9eecen_US
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivs Licenseen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en_US
dc.sourceIOP Publishingen_US
dc.titleKinetic Study of Lithiation-Induced Phase Transitions in Amorphous Germanium Thin Filmsen_US
dc.typeArticleen_US
dc.identifier.citationMiao, Jinghui, Baoming Wang, and Carl V. Thompson. “Kinetic Study of Lithiation-Induced Phase Transitions in Amorphous Germanium Thin Films.” Journal of the Electrochemical Society, 167, 9 (July 2020): © 2020 The Author(s)en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Materials Science and Engineeringen_US
dc.relation.journalJournal of the Electrochemical Societyen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dc.date.updated2020-09-11T15:18:22Z
dspace.date.submission2020-09-11T15:18:25Z
mit.journal.volume167en_US
mit.journal.issue9en_US
mit.licensePUBLISHER_CC


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