Evidence of catalyzed oxidation of Li2O2 for rechargeable Li–air battery applications

Jonathon R. Harding; Yi-Chun Lu; Yasuhiro Tsukada; Yang Shao-Horn

doi:10.1039/C2CP41761H

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Physical Chemistry Chemical Physics

Issue 30, 2012

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Evidence of catalyzed oxidation of Li₂O₂ for rechargeable Li–air battery applications

Jonathon R. Harding,^a Yi-Chun Lu,^b Yasuhiro Tsukada^c and Yang Shao-Horn*^b^c

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Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, USA

Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, USA
E-mail: shaohorn@mit.edu

Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, USA

Phys. Chem. Chem. Phys., 2012,14, 10540-10546

DOI: 10.1039/C2CP41761H
Received 29 May 2012, Accepted 30 May 2012
First published online 08 Jun 2012

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The oxidation kinetics of Li₂O₂ was studied in a carbonate-free electrolyte using electrodes consisting of non-catalyzed and catalyzed Vulcan carbon (VC) and chemically synthesized Li₂O₂ particles. VC and Au nanoparticles supported on VC (Au/C) were fairly inactive for catalyzing the oxidation of Li₂O₂, where oxidation currents greater than 10 mA g_carbon⁻¹ were found only at voltages equal to and greater than 4.0 V vs. Li (V_Li). Pt and Ru nanoparticles supported on VC (Pt/C and Ru/C) could significantly increase the kinetics of Li₂O₂ oxidation, where Li₂O₂ could be removed largely at voltages below 4 V_Li. In addition, Pt/C and Ru/C showed quick initiation of Li₂O₂ oxidation in contrast to VC and Au/C.

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Evidence of catalyzed oxidation of Li₂O₂ for rechargeable Li–air battery applications