Li-O-2 Battery Degradation by Lithium Peroxide (Li2O2): A Model Study
Artikel i vetenskaplig tidskrift, 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
Författare
S. R. Younesi
Uppsala universitet
M. Hahlin
Uppsala universitet
F. Bjorefors
Uppsala universitet
Patrik Johansson
Chalmers, Teknisk fysik, Kondenserade materiens fysik
K. Edstrom
Alistore - European Research Institute
Uppsala universitet
Chemistry of Materials
0897-4756 (ISSN) 1520-5002 (eISSN)
Vol. 25 1 77-84Ämneskategorier
Materialteknik
Kemi
Styrkeområden
Transport
Energi
Materialvetenskap
DOI
10.1021/cm303226g