Oxidation of Ethylene Carbonate on Li Metal Oxide Surfaces

Thomas M. Østergaard, Livia Giordano, Ivano Eligio Castelli, Filippo Maglia, Byron K. Antonopoulos, Yang Shao-Horn, Jan Rossmeisl*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Understanding the reactivity of the cathode surface is of key importance to the development of batteries. Here, density functional theory is applied to investigate the oxidative decomposition of the electrolyte component, ethylene carbonate (EC), on layered LixMO(2) oxide surfaces. We compare adsorption energy trends of atoms and small molecules, on both surface oxygen and metal sites, as a function of the Li content of the surface. The oxygen sites are identified as the reactive site for the electrolyte oxidation reaction (EOR). We report reaction energies and NEB-calculated kinetic barriers for the initial oxidative decomposition of EC, and correlate both with the reaction energy of hydrogen adsorption on oxygen. The hydrogen adsorption energy scales with the distance between the Fermi level and the O-2p band center. We expect this model of the EOR to be valid for other organic electrolytes and other Li metal oxide surfaces, due to its simplicity, and the model leads to simple design principles for protective coatings.
Original languageEnglish
JournalJournal of Physical Chemistry C
Volume122
Issue number19
Pages (from-to)10442-10449
ISSN1932-7447
DOIs
Publication statusPublished - 2018

Fingerprint

Dive into the research topics of 'Oxidation of Ethylene Carbonate on Li Metal Oxide Surfaces'. Together they form a unique fingerprint.

Cite this