Jump to main content
Jump to site search

Issue 11, 2013
Previous Article Next Article

Evidence for lithium superoxide-like species in the discharge product of a Li–O2 battery

Author affiliations

Abstract

We report on the use of a petroleum coke-based activated carbon (AC) with very high surface area for a Li–O2 battery cathode without the use of any additional metal catalysts. Electrochemical measurement in a tetra(ethylene) glycol dimethyl ether–lithium triflate (TEGDME–LiCF3SO3) electrolyte results in two voltage plateaus during charging at 3.2–3.5 and 4.2–4.3 V versus Li+/Li. Herein we present evidence from Raman and magnetic measurements that the lower plateau corresponds to a form of lithium peroxide with superoxide-like properties characterized by a low temperature magnetic phase transition and a high O–O stretching frequency (1125 cm−1). The magnetic phase transition and the high O–O stretching frequency disappear when charged to above 3.7 V. Theoretical calculations indicate that a surface superoxide structure on lithium peroxide clusters and some lithium peroxide surfaces have an unpaired electron and a high O–O stretching frequency that help explain the observations. These results provide evidence that the form of the lithium peroxide discharge product is important to obtaining a low charge overpotential, and thus improving the round-trip efficiency between discharge and charge.

Graphical abstract: Evidence for lithium superoxide-like species in the discharge product of a Li–O2 battery

Back to tab navigation
Please wait while Download options loads

Supplementary files

Publication details

The article was received on 08 Jan 2013, accepted on 10 Jan 2013 and first published on 17 Jan 2013


Article type: Paper
DOI: 10.1039/C3CP00069A
Citation: Phys. Chem. Chem. Phys., 2013,15, 3764-3771
  •   Request permissions

    Evidence for lithium superoxide-like species in the discharge product of a Li–O2 battery

    J. Yang, D. Zhai, H. Wang, K. C. Lau, J. A. Schlueter, P. Du, D. J. Myers, Y. Sun, L. A. Curtiss and K. Amine, Phys. Chem. Chem. Phys., 2013, 15, 3764
    DOI: 10.1039/C3CP00069A

Search articles by author