Journal
CHEMPHYSCHEM
Volume 8, Issue 13, Pages 1999-2007Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200700331
Keywords
energy conversion; lithium; Moessbauer spectroscopy; scanning probe microscopy; spinel phases
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Active CuFe2O4 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 degrees C performed at 470mAhg(-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 Fe-57 Mossbauer spectra.
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