On the electrochemical behavior of aluminum electrodes in nonaqueous electrolyte solutions of lithium salts

Boris Markovsky, Francis Amalraj, Hugo E. Gottlieb, Yossi Gofer, Surendra K. Martha, Doron Aurbach

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74 Scopus citations

Abstract

We studied the electrochemical behavior of aluminum electrodes in solutions comprising ethylene carbonate (EC)-dimethyl carbonate (DMC) and lithium salts: lithium hexafluorophospate (LiPF6), lithium perchlorate (LiClO 4), or lithium bis(oxalato)borate (LiBOB). Under anodic polarization within the potential range of 3.00-4.00 V in these solutions, aluminum electrodes demonstrate a stable behavior due to their passivation by surface films. Aluminum electrodes passivate in EC-DMC/ LiPF6 and EC-DMC/LiBOB solutions both at 30 and 60°C, whereas these electrodes remain active and corrode in EC-DMC/ LiClO4 solutions. LiBOB may decompose at anodic potentials, thus forming passive films comprising B2 O 3 and metal-oxalate species on the aluminum electrodes polarized to 4.50-5.30 V. Li2 CO3, LiF and AlPO4, and LiCl species were also detected on the electrodes anodically polarized in LiBOB-, LiPF6 -, and LiClO4 -containing solutions, respectively. At some conditions, current oscillations can be developed on aluminum electrodes upon their polarization at constant potentials. These oscillations may relate to the successive formation and dissolution of the passivating surface films formed on electrodes. The development of F2 P (O) O- species due to the polarization of aluminum electrodes in EC-DMC/ LiPF6 solutions was confirmed by solution NMR studies.

Original languageEnglish
Pages (from-to)A423-A429
JournalJournal of the Electrochemical Society
Volume157
Issue number4
DOIs
StatePublished - 2010

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