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Author Palacin, M. R. ♦ Seguin, L. ♦ Tarascon, J. M. ♦ Le Cras, F. ♦ Anne, M. ♦ Strobel, P. ♦ Chabre, Y. ♦ Amatucci, G. ♦ Vaughan, G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ENERGY STORAGE ♦ CRYSTAL STRUCTURE ♦ LITHIUM OXIDES ♦ MANGANESE OXIDES ♦ FLUORINE ADDITIONS ♦ ELECTRIC BATTERIES ♦ X-RAY DIFFRACTION ♦ ELECTROCHEMISTRY ♦ ELECTRIC CHARGES ♦ LATTICE PARAMETERS ♦ EXPERIMENTAL DATA
Abstract The structural features accompanying the lithium extraction/insertion process in a fluorine-substituted spinel oxide with formula LiMn{sub 2}(O{sub 3.74}F{sub 0.26}) were studied in situ using Bellcore-type plastic batteries directly placed in a synchrotron X-ray beam. The initial material contains two phases, a cubic spinel and a slightly orthorhombically distorted one (major phase). It becomes entirely cubic on extraction of 0.17 Li atoms per formula unit. The lithium extraction reaction around 4 V vs Li/Li{sup +} can be divided into three regions as a function of lithium content x: (1) a single-phase range for 0.59 {le} x {le} 0.83, (2) a two-phase range for 0.23 {le} x {le} 0.59 with equilibrium potential 4.122 V, (3) a narrow single-phase range III for 0.18 {le} x {le} 0.23. These three domains are fully reversible. With the exception of the presence of the initial orthorhombic distortion, the main features of the so-called electrochemical 4 V plateau are very similar to those of stoichiometric Li{sub x}Mn{sub 2}O{sub 4}.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-05-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 144
Issue Number 2


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