MANSOUR, A. N.; CROGUENNEC, Laurence; DELMAS, Claude

doi:10.1149/1.2033621

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MANSOUR, A. N.
Carderock Division

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

DELMAS, Claude
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Electrochemical and Solid-State Letters. 2005, vol. 8, n° 10, p. 544-548

Electrochemical Society

Résumé en anglais

We examined the oxidation state and atomic structures of Ni and Co in LiNi0.3Co0.7O2 and compared them with those of LiNiO2 and LiCoO2. The X-ray absorption near-edge structure and extended X-ray absorption fine structure results show that Ni (primarily) and Co are present with an oxidation state of +3. Ni(III) in LiNiO2 has a distorted octahedral coordination due to an active Jahn-Teller effect as shown previously. However, Ni(III) in LiNi0.3Co0.7O2 has a regular octahedral coordination with six oxygen atoms at a distance of 1.913 Å and, hence, the Jahn-Teller effect is inactive. The oxidation state and local atomic structure of Co in LiNi0.3Co0.7O2 are similar to those of LiCoO2.< Réduire

Mots clés en anglais

x-ray absorption

Secondary lithium cells

Fine structure analysis

Electrochemical properties

Electrode materials

Cathode materials

LiNiO2

LiCoO2

EXAFS

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A Unique Structure of Ni(III) in LiNi0.3Co0.7O2 Without Jahn-Teller Distortion

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