CROGUENNEC, Laurence; SUARD, Emmanuelle; WILLMANN, Patrick; DELMAS, Claude

doi:10.1021/cm011265v

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CROGUENNEC, Laurence
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

SUARD, Emmanuelle
Institut Laue-Langevin [ILL]

WILLMANN, Patrick
Centre National d'Études Spatiales [Toulouse] [CNES]

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Chemistry of Materials. 2002, vol. 14, n° 5, p. 2149-2157

American Chemical Society

Résumé en anglais

LiNi1-yTiyO2 (y ≤ 0.15) layered oxides were synthesized at high temperature by solid-state reactions. Rietveld refinements of their X-ray and neutron diffraction patterns showed that these phases were characterized by an α-NaFeO2-type structure with the following cationic distribution: (Li1-zNi2+z)3b(Ti4+tNi2+t+zNi3+1-z-2t)3aO2 [t = y(1 + z)]. The amount of Ni2+ ions in the lithium site increases with y. A magnetic study confirmed the presence of paramagnetic ions in the interslab space and, therefore, the cationic distribution. These materials used as positive electrode in lithium batteries show reversible behavior. A large decrease of the capacity is observed with increasing y, because of the presence of extra nickel ions in the lithium sites. For the "LixNi0.95Ti0.05O2" composition, 144 mA h/g are obtained in discharge at the 14th cycle at the C/20 rate. The "LixNi1-yTiyO2" phases were characterized for y = 0.05 and 0.10: the simultaneous presence of titanium ions in the slab and of a significant amount of extra nickel ions in the lithium sites prevents phase transitions upon cycling.< Réduire

Mots clés en anglais

Layered compounds

Inorganic compounds

Chemical synthesis

High temperature

Solid state reactions

X-ray diffractions

Neutron diffraction

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Structural and electrochemical characterization of the LiNi1-yTiyO2 electrode materials obtained by direct solid-state reactions

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