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!

carbonate electrolytes

XPS

lithium-air battery

chemical decomposition

reactivity

ether

Li2O2

li-air batteries

ray photoelectron-spectroscopy

lithium oxygen

X-ray photoelectron spectroscopy

lithium peroxide

electrochemistry

electrodes

stability

oxygen battery

chemistry

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-ERI

Uppsala universitet

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 25 77-84

Ämneskategorier

Materialteknik

Kemi

Styrkeområden

Transport

Energi

Materialvetenskap

DOI

10.1021/cm303226g