SPINEL TYPE LITHIUM MANGANATE

摘要

PROBLEM TO BE SOLVED: To prevent the reduction in discharge capacity due to a charge- discharge cycle by imparting a compsn. represented by a specified formula and regulating the atomic ratio of Li to Mn to a prescribed range. SOLUTION: Lithium acetate is mixed with manganese nitrate in a prescribed atomic ratio of Li to Mn and the resultant mixture is melted by heating to about 100 deg.C and uniformly mixed. This mixture is oxidized by heating to about 120-200 deg.C in a flow of gaseous oxygen to form a solid phase oxide. This oxide is pulverized, compacted and fired at about 800 deg.C for about 24hr in a flow of gaseous oxygen to obtain the objective spinel type lithium manganate having a compsn. represented by the formula Li1+x Mn2-x O4 . In the compsn., the atomic ratio of Li to Mn is >0.5 to <0.8.