Mechanism of anodic dissolution of the aluminum current collector in 1 M LiTFSI EC:DEC 3:7 in rechargeable lithium batteries

Kramer E, Schedlbauer T, Hoffmann B, Terborg L, Nowak S, Gores HJ, Passerini S, Winter M

Forschungsartikel (Zeitschrift) | Peer reviewed

Zusammenfassung

So-called "corrosion" of the aluminum current collector in the electrolyte 1 M LiTFSI in ethylene carbonate : diethyl carbonate, EC:DEC (3:7, by wt) has been investigated by electrochemical and analytical methods. In fact, Al "corrosion" in this electrolyte is actually an anodic Al dissolution reaction. In addition to Al dissolution various electrolyte degradation processes were identified. A combination of a specially developed on-line ICP-OES method and in situ EQCM measurements revealed that before the dissolution of aluminum starts, an "activation" process takes place for ca. 6 hours, which is accompanied by strong electrolyte oxidation. The electrolyte decomposition reactions were investigated by ex situ IC measurements which showed that the LiTFSI decomposed and that F- is the main decomposition product. ex situ GC-MS measurements revealed that also the solvent decomposes and CO2 as well as ethoxyethanol are formed as degradation products. © 2012 The Electrochemical Society.

Details zur Publikation

FachzeitschriftJournal of The Electrochemical Society
Jahrgang / Bandnr. / Volume160
Ausgabe / Heftnr. / Issue2
StatusVeröffentlicht
Veröffentlichungsjahr2013
Sprache, in der die Publikation verfasst istEnglisch
DOI10.1149/2.081302jes
Link zum Volltexthttp://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84875419818

Autor*innen der Universität Münster

Gores, Heiner
Institut für Physikalische Chemie
Hoffmann, Björn
Münster Electrochemical Energy Technology Battery Research Center (MEET)
Krämer, Elisabeth
Institut für Physikalische Chemie
Nowak, Sascha
Münster Electrochemical Energy Technology Battery Research Center (MEET)
Passerini, Stefano
Institut für Physikalische Chemie
Schedlbauer, Tanja Franziska
Institut für Physikalische Chemie
Terborg, Lydia
Institut für Anorganische und Analytische Chemie
Winter, Martin
Münster Electrochemical Energy Technology Battery Research Center (MEET)