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Titolo:
In situ XAS study of LixNi0.7Fe0.15Co0.15O2 cathode material
Autore:
Mansour, AN; Croguennec, L; Prado, G; Delmas, C;
Indirizzi:
USN, Ctr Surface Warfare, Carderock Div, Bethesda, MD 20817 USA USN Bethesda MD USA 20817 Warfare, Carderock Div, Bethesda, MD 20817 USA CNRS, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France CNRS Pessac France F-33608 at Condensee Bordeaux, F-33608 Pessac, France Ecole Natl Super Chim & Phys Bordeaux, F-33608 Pessac, France Ecole Natl Super Chim & Phys Bordeaux Pessac France F-33608 ssac, France
Titolo Testata:
JOURNAL OF SYNCHROTRON RADIATION
, volume: 8, anno: 2001,
parte:, 2
pagine: 866 - 868
SICI:
0909-0495(200103)8:<866:ISXSOL>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAY-ABSORPTION SPECTROSCOPY; ELECTRODE MATERIALS; LIXCOO2; LINIO2;
Keywords:
lithium nickel oxide; in situ; x-ray absorption spectroscopy; structure; oxidation state; intercalation materials; metal substitution; lithium batteries;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Mansour, AN USN, Ctr Surface Warfare, Carderock Div, 9500 MacArthur Blvd, Bethesda, MD20817 USA USN 9500 MacArthur Blvd Bethesda MD USA 20817 sda, MD20817 USA
Citazione:
A.N. Mansour et al., "In situ XAS study of LixNi0.7Fe0.15Co0.15O2 cathode material", J SYNCHROTR, 8, 2001, pp. 866-868

Abstract

We have examined the oxidation states and local atomic structures of Ni, Fe, and Co in LixNi0.7Fe0.15Co0.15O2 as a function of Li content during the first charge in a Li//LixNi0.7Fe0.15Co0.15O2 nonaqueous cell. We show that the composition of the material in the pristine state is more accurately described by Li0.95Ni(II)(0.09)Ni(III)(0.66)Fe(III)(0.15)Co(III)(0.15)O-2. Half of the Ni(II) resides in Li-vacant sites. Both Fe and Co substitute for Ni within the NiO2 slabs with no significant amounts of Fe or Co that can be attributed to Li-vacant sites. The local structure parameters are consistent with oxidation states observed on the basis of the XANES data. The Ni K-edge energy continuously shifts to a higher energy with decrease in Li content due to oxidation of Ni( II) to Ni( III) and Ni( III) to Ni( IV). Afterthe complete oxidation of Ni( III) to Ni( IV), the Fe K-edge energy beginsto increase with further decrease in Li content indicating the oxidation of Fe( III) to Fe( IV). The Co K-edge energy at half-height, on the other hand, is unchanged during the whole range of Li deintercalation indicating that no significant change in the oxidation state of Co occurs upon the complete removal of Li.

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Documento generato il 24/09/20 alle ore 02:11:33