Kozmenkova, Anna Ya., Kataev, Elmar Yu., Belova, Alina I., Arnati, Matteo, Gregoratti, Luca, Velasco-Velez, Juan, Knop-Gericke, Axel, Senkovsky, Boris, Vyalikh, Denis V., Itkis, Daniil M., Shao-Horn, Yang and Yashina, Lada V. (2016). Tuning Surface Chemistry of TiC Electrodes for Lithium-Air Batteries. Chem. Mat., 28 (22). S. 8248 - 8256. WASHINGTON: AMER CHEMICAL SOC. ISSN 1520-5002

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Abstract

One of the key problems hindering practical implementation of lithium-air batteries is caused by carbon cathode chemical instability leading to low energy efficiency and short cycle life. Titanium carbide (TiC) nanopowders are considered as an alternative cathode material; however, they are intrinsically reactive toward oxygen, and its stability is controlled totally by a surface overlayers. Using photo-emission spectroscopy, we show that lithium-air battery discharge product, lithium peroxide (Li2O2), easily oxidizes clean TiC surface. At the same time, TiC surface, which was treated by molecular oxygen under ambient conditions, shows much better stability in contact with Li2O2 that can be explained by the presence of a surface layer containing a significant amount of elemental carbon in addition to oxides and oxycarbides. Nevertheless, such protective coatings produced by room temperature oxidation are not practically useful as one of its components, elemental carbon, is oxidized in the presence of lithium-air battery discharge intermediates. These results are of critical importance in understanding of TiC surface chemistry and in design of stable lithium air battery electrodes. We postulate that dense, uniform, carbon-free titanium dioxide surface layers of 2-3 nm thickness on TiC will be a promising solution, and thus further efforts should be taken for developing synthetic protocols enabling preparation of TiO2/TiC core-shell structures.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Kozmenkova, Anna Ya.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kataev, Elmar Yu.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Belova, Alina I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Arnati, MatteoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gregoratti, LucaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Velasco-Velez, JuanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knop-Gericke, AxelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Senkovsky, BorisUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vyalikh, Denis V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Itkis, Daniil M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shao-Horn, YangUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yashina, Lada V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-255545
DOI: 10.1021/acs.chemmater.6b03195
Journal or Publication Title: Chem. Mat.
Volume: 28
Number: 22
Page Range: S. 8248 - 8256
Date: 2016
Publisher: AMER CHEMICAL SOC
Place of Publication: WASHINGTON
ISSN: 1520-5002
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
OXYGEN REDUCTION; LI-O-2 BATTERY; TITANIUM CARBIDE; OXIDATION; 1ST-PRINCIPLES; SOLVENT; CARBON; ESCAMultiple languages
Chemistry, Physical; Materials Science, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/25554

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