Raman Evidence for Late Stage Disproportionation in a Li–O2 Battery
- 28 July 2014
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 5 (15), 2705-2710
- https://doi.org/10.1021/jz501323n
Abstract
Raman spectroscopy is used to characterize the composition of toroids formed in an aprotic Li-O2 cell based on an activated carbon cathode. The trends in the Raman data as a function of discharge current density and charging cutoff voltage provide evidence that the toroids are made up of outer LiO2-like and inner Li2O2 regions, consistent with a disproportionation reaction occurring in the solid phase. The LiO 2-like component is found to be associated with a new Raman peak identified in the carbon stretching region at ∼1505 cm-1, which appears only when the LiO2 peak at 1123 cm-1 is present. The new peak is assigned to distortion of the graphitic ring stretching due to coupling with the LiO2-like component based on density functional calculations. These new results on the LiO2-like component from Raman spectroscopy provide evidence that a late stage disproportionation mechanism can occur during discharge and add new understanding to the complexities of possible processes occurring in Li-O2 batteries. © 2014 American Chemical Society.Funding Information
- Office of Energy Efficiency and Renewable Energy
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