In SituStructural Study of 4V-Range Lithium Extraction/Insertion in Fluorine-Substituted LiMn2O4

作者: M.R. Palacı́n , F. Le Cras , L. Seguin , M. Anne , Y. Chabre

DOI: 10.1006/JSSC.1999.8166

关键词: Crystal structureOxideX-ray crystallographyLithiumExtraction (chemistry)SpinelInorganic chemistryAnalytical chemistryOrthorhombic crystal systemFormula unitChemistry

摘要: The structural features accompanying the lithium extraction/insertion process in a fluorine-substituted spinel oxide with formula LiMn2(O3.74F0.26) were studiedin situusing Bellcore-type plastic batteries directly placed synchrotron X-ray beam. initial material contains two phases, cubic and slightly orthorhombically distorted one (major phase). It becomes entirely on extraction of 0.17 Li atoms per unit. reaction around 4 V vs Li/Li+can be divided into three regions as function contentx: (1) single-phase range for 0.59≤x≤0.83, (2) two-phase 0.23≤x≤0.59 equilibrium potential 4.122 V, (3) narrow III 0.18≤x≤0.23. These domains are fully reversible. With exception presence orthorhombic distortion, main so-called electrochemical plateau very similar to those stoichiometric LixMn2O4.

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