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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/18841

Title: Lithiation and Delithiation Mechanisms of Gold Thin Film Model Anodes for Lithium Ion Batteries: Electrochemical Characterization
Authors: Bach, Philipp
Stratmann, M.
Valencia-Jaime, I.
Romero, A. H.
Renner, Frank
Issue Date: 2015
Citation: ELECTROCHIMICA ACTA, 164, p. 81-89
Abstract: Lithium Ion batteries have to be significantly improved to fulfill the challenging needs in electromobility or large scale energy storage technology. In this context the use of model electrodes such as single-crystals or thin films allows well-defined mechanistic studies. Here we present a detailed electrochemical investigation of the lithiation-delithiation behavior of Au thin film model electrodes in ionic liquid electrolyte. Cyclic voltammetry, galvanostatic-, stepwise potentiostatic lithiation-delithiation cycles, as well as galvanostatic intermittent titration technique, GITT, measurements were performed. We found nearly identical mechanism of Li insertion and extraction in these three types of measurements at different current levels. The mechanism of alloying or lithiation deviated from the mechanism of dealloying or delithiation. While during the lithiation process two main plateaus related to phase transformations occur in the potential-time curves three main plateaus appear during delithiation. First results of theoretical simulations confirm a high number of possible metastable phases in the Li-Au system. The measurements also point to the influence of SEI-film formation on the cycling behavior. Based on these insights a mechanistic sequence and a phase evolution diagram for the electrochemical alloying of Li with Au are presented. (C) 2015 Elsevier Ltd. All rights reserved.
Notes: [Bach, P.; Renner, F. U.] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Bach, P.; Stratmann, M.; Renner, F. U.] Max Planck Inst Eisenforsch GmbH, D-40237 Dusseldorf, Germany. [Bach, P.; Stratmann, M.] Ruhr Univ Bochum, Ctr Electrochem Sci CES, D-44780 Bochum, Germany. [Valencia-Jaime, I.] IPN, Ctr Invest & Estudios Avanzados, MX-76001 Santiago De Queretaro, Mexico. [Valencia-Jaime, I.; Romero, A. H.] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA.
URI: http://hdl.handle.net/1942/18841
DOI: 10.1016/j.electacta.2015.02.184
ISI #: 000352499000010
ISSN: 0013-4686
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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