Electronic state of cobalt and oxygen ions in stoichiometric and nonstoichiometric Li1+xCoO2 before and after delithiation according to XPS and DRS / Kosova N.V., Kaichev V.V., Bukhtiyarov V.I., Kellerman D.G., Devyatkina E.T., Larina T.V. // Journal of Power Sources. - 2003. - V. 119-121, l. . - P. 669-673.

ISSN:

03787753

Type:

Conference Paper

Abstract:

X-ray, IRS, XPS, EDRS and magnetic measurements were used to study Li1+xCoO2 (0 < x ≥ 0.1) samples prepared by conventional ceramic method. It was shown that nonstoichiometric Li1+xCoO2 are characterized by homogeneous crystal structure with statistically distributed vacancies in the cobalt and oxygen layers and the increased Co-O bond covalency. The excess lithium results not in the reduction of Co3+ ions, but in the appearance of a new state of oxygen ions different from cell oxide, with higher value of binding energy (BE), i.e. with smaller electronic density. Acid treatment of Li1+xCoO2 leads to the appearance of delocalized (itinerant) electrons. The electronic state of cobalt ions does not change noticeably whereas the additional oxygen state increases significantly, thus, evidencing that oxygen ions do compensate for the charge upon chemical delithiation. The structure of nonstoichiometric samples appeared to be more stable upon this process. © 2003 Elsevier Science B.V. All rights reserved.

Author keywords:

Delithiation; EDRS; Electronic structure; Lithium cobalt oxide; Magnetic measurements; Nonstoichiometry; XPS

Index keywords:

Crystal structure; Electrochemistry; Electronic density of states; Electronic structure; Fourier transform infrared spectroscopy; Magnetic variables measurement; Stoichiometry; X ray photoelectron spe

DOI:

10.1016/S0378-7753(03)00207-6

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038009356&doi=10.1016%2fS0378-7753%2803%2900207-6&partnerID=40&md5=3df13fb4110a8f0f46db593a7b68792e

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Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-0038009356&doi=10.1016%2fS0378-7753%2803%2900207-6&partnerID=40&md5=3df13fb4110a8f0f46db593a7b68792e
Affiliations	Institute of Solid State Chemistry, SB, RAS, Kutateladze 18, Novosibirsk 630128, Russian Federation; Boreskov Institute of Catalysis, SB, RAS, pr. Lavrent'eva 5, Novosibirsk 630090, Russian Federation; Institute of Solid State Chemistry, UB, RAS, Pervomaiskaya 91, Ekaterinburg 620219, Russian Federation
Author Keywords	Delithiation; EDRS; Electronic structure; Lithium cobalt oxide; Magnetic measurements; Nonstoichiometry; XPS
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Correspondence Address	Kosova, N.V.; Institute of Solid State Chemistry, SB, RAS, Kutateladze 18, Novosibirsk 630128, Russian Federation; email: kosova@solid.nsc.ru
Editors	McLarnon F.
Conference name	Selected Papers Presented at the 11th IMLB
Conference date	22 June 2002 through 28 June 2002
Conference location	Monterey, CA
Conference code	61111
CODEN	JPSOD
Language of Original Document	English
Abbreviated Source Title	J Power Sources
Source	Scopus