Journal
ELECTROCHIMICA ACTA
Volume 47, Issue 11, Pages 1829-1835Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0013-4686(02)00024-5
Keywords
lithium batteries; nickel; manganese spinel oxides; 5 V electrodes
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A new lithium-excess method is used for the synthesis of LiNi0.5Mn1.5O4 electrode materials at temperatures in the 600-800 degreesC range. Higher average manganese oxidation state and lower impurity contents are detected from X-ray diffraction in the spinet samples, as compared with stoichiometric synthesis. These properties cause the virtual elimination of the 4 V capacity, thus allowing a higher performance of these 5 V materials. A two-phase model of lithium extraction-insertion is detected by X-ray diffraction of electrodes prepared at different extensions of charge. (C) 2002 Elsevier Science Ltd. All rights reserved.
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