A new piece in the puzzle of lithium/air batteries: computational study on the chemical stability of propylene carbonate in the presence of lithium peroxide.
Summary of "A new piece in the puzzle of lithium/air batteries: computational study on the chemical stability of propylene carbonate in the presence of lithium peroxide."
The electrolyte role in non-aqueous lithium/air batteries is attracting a lot of attention in several research groups, because of its fundamental importance in producing the appropriate reversible electrochemical reduction. While recent published works identify the lithium superoxide as the main degrading agent for propylene carbonate (PC), there is no clear experimental evidence that the oxygen at the cathode interface layer does not reduce further to peroxide before reacting with PC. Here, we investigate the reactivity of lithium peroxide versus propylene carbonate and find that Li(2) O(2) irreversibly decomposes the carbonate solvent, leading to alkyl carbonates. We also show that, compared with a single Li(2) O(2) unit in PC, a crystalline surface of Li(2) O(2) exhibits an enhanced reactivity. Our findings support the possibility that in lithium/air cells, oxygen may still be reduced to peroxide, with the formation of solid Li(2) O(2) , which degrades by decomposing PC.
Affiliation
IBM Research-Zurich, Säumerstrasse 4, 8803 Rüschlikon (Switzerland), Fax: (+41) 44-724-8958. teo@zurich.ibm.com.
Journal Details
This article was published in the following journal.
Name: Chemistry (Weinheim an der Bergstrasse, Germany)
ISSN: 1521-3765
Pages: 3510-20
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22354790
- DOI: http://dx.doi.org/10.1002/chem.201103057
Medical and Biotech [MESH] Definitions
Lithium Carbonate
A lithium salt, classified as a mood-stabilizing agent. Lithium ion alters the metabolism of BIOGENIC MONOAMINES in the CENTRAL NERVOUS SYSTEM, and affects multiple neurotransmission systems.
Lithium Chloride
A salt of lithium that has been used experimentally as an immunomodulator.
Lithium Compounds
Inorganic compounds that contain lithium as an integral part of the molecule.
Lithium
An element in the alkali metals family. It has the atomic symbol Li, atomic number 3, and atomic weight 6.94. Salts of lithium are used in treating BIPOLAR DISORDER.
Alkalies
Usually a hydroxide of lithium, sodium, potassium, rubidium or cesium, but also the carbonates of these metals, ammonia, and the amines. (Grant & Hackh's Chemical Dictionary, 5th ed)
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