| 摘要 |
PROBLEM TO BE SOLVED: To produce a thin film consisting essentially of LiMn2 O4 by heat-treating a lithium compound and a manganese compound in the presence of a lithium salt flux having evaporation properties while controlling a gaseous atmosphere. SOLUTION: This thin film consists essentially of LiMn2 O4 . The thin film is produced by heat-treating a lithium compound and a manganese compound in the presence of a lithium salt flux having evaporating properties while controlling a gaseous atmosphere. A chloride, a carbonate and a hydroxide are preferably used as the lithium compound which is a raw material and a carbonate, a hydroxide, a sulfate and the like are preferably used as the manganese compound. The lithium compound is mixed with the manganese compound so as to provide 1:(0.2-5) molar ratio of Li:Mn. A chloride and a fluoride of lithium are preferred as the flux having the evaporating properties and can be used even as a raw material for reaction. The raw materials and flux are sufficiently mixed and preferably heated at 650-800 deg.C. After a prescribed time, the resultant sample is washed with water to dissolve and separate the flux. The prepared sample is then dried to provide a lithium manganese compound in the form of a thin film. LiMn2 O4 is preferably obtained by heating the raw materials and flux while initially controlling the atmosphere to an oxidizing one and then controlling the atmosphere to a nonoxidizing one in a film growing process. Thereby, a high-performance lithium secondary battery or an ion-selective adsorbent can be produced. |
