Open AccessSurface Reactivity of a Carbonaceous Cathode in a Lithium Triflate/Ether Electrolyte-Based Li–O2 Cell
Author(s) -
Marco Carboni,
Sergio Brutti,
Andrea Giacomo Marrani
Publication year - 2015
Publication title -
acs applied materials and interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.535
H-Index - 228
eISSN - 1944-8252
pISSN - 1944-8244
DOI - 10.1021/acsami.5b05202
Subject(s) - electrolyte , materials science , cathode , electrochemistry , lithium (medication) , chemical engineering , trifluoromethanesulfonate , fourier transform infrared spectroscopy , reactivity (psychology) , electrochemical cell , electrode , inorganic chemistry , chemistry , organic chemistry , catalysis , medicine , alternative medicine , engineering , endocrinology , pathology
Li-O2 batteries are currently one of the most advanced and challenging electrochemical systems with the potential to largely overcome the performances of any existing technology for energy storage and conversion. However, these optimistic expectations are frustrated by the still inadequate understanding of the fundamentals of the electrochemical/chemical reactions occurring at the cathode side, as well as within the electrolyte and at the three-phase interface. In this work, we illustrate the evolution of the morphology and composition of a carbonaceous cathode in the first discharge/charge in a Li-O2 cell with an ether-based electrolyte by X-ray photoemission spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy. Experiments have been carried out ex situ on electrodes recuperated from electrochemical cells stopped at various stages of galvanostatic discharge and charge. Apparently, a reversible accumulation and decomposition of organic and inorganic precipitates occurs upon discharge and charge, respectively. These precipitations and decompositions are likely driven by electrochemical and chemical parasitic processes due to the reactivity of the cathode carbonaceous matrix.