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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents

ID: 192696.0, MPI für Festkörperforschung / FKF Publikationen 2004
Effect of iron on delithiation in LixCo1-yFeyO2. Part 1: in-situ electrochemical and X-ray diffraction study
Authors:Holzapfel, M.; Strobel, P.; Darie, C.; Wright, J.; Morcrette, M.; Chappel, E.; Anne, M.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of Materials Chemistry
Issue / Number:1
Start Page:94
End Page:101
Review Status:not specified
Audience:Not Specified
Abstract / Description:Structural changes occurring upon electrochemical delithiation in
LixCo1-yFeyO2 solid solutions have been examined using in-situ
electrochemical X-ray diffraction on plastic batteries, for y=0.1, 0.2,
0.4 and 0.7. Two key points are emphasised in this study: (i) the
influence of partial iron substitution on the LixCoO2 phase diagram,
especially regarding the multiple phase transitions present for 0less
than or equal toxless than or equal to1, (ii) the redox behaviour of
iron along with cobalt during the electrochemical process. The y=0.1
and y=0.2 samples could be totally delithiated and resemble
unsubstituted LixCoO2: these systems are two-phase in the range
0.6<x<0.9, where two distinct rhombohedral phases coexist, and a
specific phase exists in the highly delithiated region. However no
ordered analog to Li0.5CoO2 is found. The symmetry of the completely
delithiated phases is trigonal (O1, CdI2-type, P (3) over bar m1 space
group) and monoclinic (O3, CdCl2-type, C2/m space group) for y=0.1 and
0.2, respectively. For LixCo0.6Fe0.4O2, the two-phase regime is
maintained down to x=0.4, and no new phase is detected down to x=0.18.
The electrochemical capacities obtained show that iron is involved in
the oxidation process. This will be confirmed by EXAFS and XANES
measurements, the results of which are published in the second part of
this series.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:UJF, INPG, CNRS, Lab Electrochim & Physicochim Mat & Interfaces, F-38402 St Martin Dheres, France.
; CNRS, Lab Champs Magnet Intenses, F-38042 Grenoble 9, France.
; Max Planck Inst Festkorperforsch, F-38042 Grenoble 9, France.
; CNRS, Cristallog Lab, F-38042 Grenoble 9, France.
; European Synchrotron Radiat Facil, F-38043 Grenoble, France.
; UPJV, CNRS, Lab React & Chim Solides, F-80039 Amiens, France.
Identifiers:ISI:000187533200015 [ID No:1]
ISSN:0959-9428 [ID No:2]
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