作者: M.R. Palacı́n , F. Le Cras , L. Seguin , M. Anne , Y. Chabre
关键词: Crystal structure 、 Oxide 、 X-ray crystallography 、 Lithium 、 Extraction (chemistry) 、 Spinel 、 Inorganic chemistry 、 Analytical chemistry 、 Orthorhombic crystal system 、 Formula unit 、 Chemistry
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.