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Structure and Electrochemical Performances of the Li1+x(Ni0.425Mn0.425Co0.15)1−xO2 Materials

Published online by Cambridge University Press:  01 February 2011

N. Tran ,
L. Croguennec ,
F. Weill ,
C. Jordy ,
P. Biensan  and
C. Delmas
N. Tran
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS)and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux (ENSCPB), Université Bordeaux I, 87 av. du Dr A. Schweitzer, 33608 Pessac cedex, France
L. Croguennec*
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS)and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux (ENSCPB), Université Bordeaux I, 87 av. du Dr A. Schweitzer, 33608 Pessac cedex, France
F. Weill
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS)and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux (ENSCPB), Université Bordeaux I, 87 av. du Dr A. Schweitzer, 33608 Pessac cedex, France CREMEM, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
C. Jordy
Affiliation:
SAFT, Direction de la recherche, 111–113 Bld Alfred Daney, 33000 Bordeaux, France
P. Biensan
Affiliation:
SAFT, Direction de la recherche, 111–113 Bld Alfred Daney, 33000 Bordeaux, France
C. Delmas
Affiliation:
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB-CNRS)and Ecole Nationale Supérieure de Chimie et Physique de Bordeaux (ENSCPB), Université Bordeaux I, 87 av. du Dr A. Schweitzer, 33608 Pessac cedex, France
*
* Phone +33–5–4000–2234 (or 2647), Fax +33–5–4000–6698, [email protected]
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Abstract

Layered Li1+x(Ni0.425Mn0.425Co0.15)1−xO2 materials (x = 0 and 0.12) have been prepared by a coprecipitation method. The substitution of × Li+ ions for × metal ions in the transition metal layers leads to an increase in the average transition metal oxidation state for charge compensation, which was found to be due to the oxidation of Ni2+ ions into Ni3+ ions. The refinement in the R-3m space group of the X-ray diffraction data has shown an increasing lamellar character for the structure of these materials, with increasing overlithiation. Electron diffraction has revealed the presence of a √3.ahex. × √3.ahex. superstructure due to a cationic ordering in the transition metal layers, those being packed with faults along the chex.-axis. From an electrochemical point of view, the reversible capacity in the 2–4.3V decreased with overlithiation, in agreement with a decreasing amount of exchangeable electrons.

Keywords

Layered oxidesOverlithiationCationic mixingX-ray diffractionElectron diffractionLithium-Ion battery
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 835: Symposium K – Solid-State Ionics , 2004 , K10.8
Copyright
Copyright © Materials Research Society 2005

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References

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