Li-O-2 Battery Degradation by Lithium Peroxide (Li2O2): A Model Study
Journal article, 2013
The chemical stability of the Li-O-2 battery components (cathode and electrolyte) in contact with lithium peroxide (Li2O2) was investigated using X-ray photoelectron spectroscopy (XPS). XPS is a versatile method to detect amorphous as well as crystalline decomposition products of both salts and solvents. Two strategies were employed. First, cathodes including carbon, alpha-MnO2 catalyst, and Kynar binder (PVdF-HFP) were exposed to Li2O2 and LiClO4 in propylene carbonate (PC) or tetraethylene glycol dimethyl ether (TEGDME) electrolytes. The results indicated that Li2O2 degrades TEGDME to carboxylate containing species and that the decomposition products, in turn, degraded the Kynar binder. The alpha-MnO2 catalyst was unaffected. Second, Li2O2 model surfaces were kept in contact with different electrolytes to investigate the chemical stability and also the resulting surface layer on Li2O2. Further, the XPS experiments revealed that the Li salts such as LiPF6, LiBF4, and LiC!
chemistry
li-air batteries
oxygen battery
XPS
carbonate electrolytes
electrochemistry
lithium-air battery
chemical decomposition
ether
X-ray photoelectron spectroscopy
Li2O2
lithium peroxide
lithium oxygen
electrodes
ray photoelectron-spectroscopy
reactivity
stability
Author
S. R. Younesi
Uppsala University
M. Hahlin
Uppsala University
F. Bjorefors
Uppsala University
Patrik Johansson
Chalmers, Applied Physics, Condensed Matter Physics
K. Edstrom
Alistore - European Research Institute
Uppsala University
Chemistry of Materials
0897-4756 (ISSN) 1520-5002 (eISSN)
Vol. 25 1 77-84Subject Categories
Materials Engineering
Chemical Sciences
Areas of Advance
Transport
Energy
Materials Science
DOI
10.1021/cm303226g