A Spectroelectrochemical Study of Oxygen Electrode Reactions in Dimethyl Sulfoxide Electrolyte for Aprotic Li-O2 Batteries

Thursday, 30 July 2015: 11:40
Carron (Scottish Exhibition and Conference Centre)
Z. Peng, X. Zhang, Y. Zhang (Changchun Institute of Applied Chemistry), and P. G. Bruce (University of Oxford, Department of Materials)
Due to their high theoretical energy density, Li-O2 systems based on aprotic electrolytes have attracted a great deal of interest in the past few years.1-3 Operation of an aprotic Li-O2 battery critically relies on the reversible and efficient oxygen electrode reactions occuring in the positive electrode.4,5 Therefore, it is important to understand the oxygen reaction mechanisms at the positive electrode/Li+ electrolyte interface. Here, we report a mechanistic study of a model system, i.e., oxygen reactions on an Au electrode in a Li+dimethyl sulfoxide (DMSO) electrolyte with a range of complementary techniques. By spectroscopically identifying the reaction products and intermediates, coupled with electrochemical measurements under well-defined conditions, oxygen reaction pathways and the rate limiting steps were depicted.


[1] Bruce, P. G.; Freunberger, S. A.; Hardwick, L. J.; Tarascon, J.-M. Nat. Mater. 2012, 11,  19-29.

[2] Lu, J.; Li, L.; Park, J.-B.; Sun, Y. -K.; Wu, F.; Amine, K. Chem. Rev. 2014, 114, 5611-5640.

[3] Luntz, A. C.; McCloskey, B. D. Chem. Rev. 2014, 114, 11721–11750.

[4] Peng, Z.Q.; Freunberger, S. A.; Chen, Y.; Bruce, P. G. Science 2012, 337, 563-566.

[5] Peng, Z.Q.; Zhang, X.M.; Zhang, Y.L.; Bruce, P.G.  manscirpt in preparation.