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57 Fe Mössbauer Spectroscopy and Electron Microscopy Study of Metal Extraction from CuFe 2 O 4 Electrodes in Lithium Cells
Author(s) -
Bomio Mauricio,
Lavela Pedro,
Tirado José Luis
Publication year - 2007
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200700331
Subject(s) - thermal decomposition , lithium (medication) , annealing (glass) , impurity , scanning electron microscope , spinel , electrode , electrochemistry , analytical chemistry (journal) , metal , materials science , mössbauer spectroscopy , inorganic chemistry , decomposition , oxide , electron microscope , chemistry , crystallography , metallurgy , chromatography , medicine , physics , organic chemistry , optics , composite material , endocrinology
Active CuFe 2 O 4 electrode materials for lithium cells are produced by thermal decomposition of a citrate precursor. The precipitation of the metal citrate is carried out by a freeze‐drying procedure. A tetragonally distorted spinel structure is prepared by the decomposition of a citrate precursor. Samples free of impurities are obtained depending on the annealing temperature. The sample heated at 800 °C performed at 470 mAh g −1 after 50 cycles. Electron microscopy is used as the ultimate technique to monitor the morphological changes upon the reversible conversion reaction. Detachment of metallic particles from the starting material, the formation of a polymeric organic film, and the subsequent removal on charging are discussed as determining factors in the electrochemical behaviour of this oxide as an electrode versus lithium. The growth of metallic iron aggregates is inferred from the 57 Fe Mössbauer spectra.