Abstract
A simple and effective method for the synthesis of LiMn₂O₄ powder as a cathode material for lithium secondary battery is reported. Micrometer size LiMn₂O₄ was prepared by combustion synthesis technique employing initial mixture of 1.1LiNO₃-1.3Mn-0.7MnO₂-1NaCl composition. Parametric study of the combustion process including molar ratio of Mn/MnO₂ and NaCl concentration were carried out under air atmosphere. The combustion products obtained were additionally heat treated at the temperature 900℃ and the washed by distilled water. The results of charging-discharging characteristics revealed that LiMn₂O₄ cell synthesized in the presence of NaCl had a high capacity and much better reversibility than one formed without NaCl. An approximate chemical mechanism for LiMn₂O₄ formation is proposed.
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