Chemical versus Electrochemical Electrolyte Oxidation on NMC111, NMC622, NMC811, LNMO, and Conductive Carbon

Roland Jung; Michael Metzger; Filippo Maglia; Christoph Stinner; Hubert A Gasteiger

doi:10.1021/acs.jpclett.7b01927

Chemical versus Electrochemical Electrolyte Oxidation on NMC111, NMC622, NMC811, LNMO, and Conductive Carbon

J Phys Chem Lett. 2017 Oct 5;8(19):4820-4825. doi: 10.1021/acs.jpclett.7b01927. Epub 2017 Sep 21.

Authors

Roland Jung^{1

2}, Michael Metzger¹, Filippo Maglia², Christoph Stinner², Hubert A Gasteiger¹

Affiliations

¹ Chair of Technical Electrochemistry, Department of Chemistry and Catalysis Research Center, Technische Universität München , Lichtenbergstrasse 4, 85748 Garching, Germany.
² BMW AG , Petuelring 130, 80788 Munich, Germany.

PMID: 28910111
DOI: 10.1021/acs.jpclett.7b01927

Abstract

We compare the stability of alkyl carbonate electrolyte on NMC111, -622, and -811, LNMO, and conductive carbon electrodes. We prove that CO₂ and CO evolution onset potentials depend on the electrode material and increase in the order NMC811 < NMC111 ≈ NMC622 < conductive carbon ≈ LNMO, which we rationalize by two fundamentally different oxidation mechanisms, the chemical and the electrochemical electrolyte oxidation. Additionally, in contrast to the widespread understanding that transition metals in cathode active materials catalyze the electrolyte oxidation, we will prove that such a catalytic effect on the electrochemical electrolyte oxidation does not exist.