Investigating the Li-O2 battery in an ether-based electrolyte using differential electrochemical mass spectrometry

Christopher J. Barile, Andrew A. Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

We use differential electrochemical mass spectrometry (DEMS) to characterize the Li-O2 battery in an electrolyte containing tetraethylene glycol dimethyl ether (TEGDME) and lithium triflate (LiOTf) and examine the effect of several cathode catalysts. Au nanoparticles increase the amount of O2 evolved during charge and improve the cycleability of the cell. In contrast, Pt, Pd, and Cu(II) oxide catalysts are detrimental to battery performance because they catalyze solvent or carbon cathode decomposition as evidenced by CO2 evolution. Regardless of the catalyst employed, the amount of O2 measured upon charge is significantly less than that expected for complete Li2O2 formation and decomposition, in agreement with the rapidly fading capacity observed during battery cycling. These findings suggest that TEGDME is not a suitable solvent for a reversible Li-O2 battery.

Original languageEnglish (US)
Pages (from-to)A549-A552
JournalJournal of the Electrochemical Society
Volume160
Issue number4
DOIs
StatePublished - Apr 8 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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