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Titolo:
Structural changes and thermal stability: in situ X-ray diffraction studies of a new cathode material LiMg0.125Ti0.125Ni0.75O2
Autore:
Yang, XQ; Sun, X; McBreen, J;
Indirizzi:
Brookhaven Natl Lab, Upton, NY 11973 USA Brookhaven Natl Lab Upton NY USA11973 aven Natl Lab, Upton, NY 11973 USA
Titolo Testata:
ELECTROCHEMISTRY COMMUNICATIONS
fascicolo: 10, volume: 2, anno: 2000,
pagine: 733 - 737
SICI:
1388-2481(200010)2:10<733:SCATSI>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SECONDARY LITHIUM CELLS; ION CELLS; LIXCOO2; R(3)OVER-BAR-M; LI-1-XNIO2; BATTERIES; SAFETY; LINIO2;
Keywords:
synchrotron X-ray diffraction; LiMg0.125Ti0.125Ni0.75O2; phase transition; lithium batteries;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Yang, XQ Brookhaven Natl Lab, Upton, NY 11973 USA Brookhaven Natl Lab Upton NY USA 11973 Lab, Upton, NY 11973 USA
Citazione:
X.Q. Yang et al., "Structural changes and thermal stability: in situ X-ray diffraction studies of a new cathode material LiMg0.125Ti0.125Ni0.75O2", ELECTROCH C, 2(10), 2000, pp. 733-737

Abstract

In situ X-ray diffraction studies in using synchrotron radiation were carried out on a new cathode material LiMg0.125Ti0.125Ni0.75O2 in a charging cell. It had been demonstrated [Y. Gao, M.V. Yakovleva, W.B. Ebner, Electrochem. Solid State Left. 1 (1998) 117] that this new material has thermal stability superior to that of LiNiO2 and LiCo0.2Ni0.8O2 at an over-charged state. In this paper, studies of the relationship between the structural changes during charge and the thermal stability at an over-charged state are presented. For the first time, a hypothesis is proposed to attribute the poor thermal stability of LiNiO2 based materials at overcharged state to the formation of hexagonal phase (H3). An irreversible contraction along crystal 'c' axis usually occurs during the H3 phase formation. According to this hypothesis, improved thermal stability can be obtained by suppressing the formation of H3 phase. The reversibility of the structural changes during overcharge-discharge cycle for this new material is compared with the irreversible structural changes of the LiNiO2 cathode under the same condition. (C) 2000 Published by Elsevier Science S.A.

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Documento generato il 20/09/20 alle ore 00:51:25