Stable supply of a cathode material for a lithium secondary battery that excels in sinterbility and composition stability and can exhibit satisfactory battery performance is accomplished by reducing to 100 ppm or less both the contents of Na and S being im...

A positive plate material for lithium secondary cells stably exhibiting excellent performance including the cell initial capacity, cycle characteristics, and the safety. The material is procuded by dripping an aqueous solution of a salt (e.g., cobalt sulfa...

The invention is intended to establish means for stably producing manganese oxide high in tap density, suitable for use as a raw material for producing a positive plate material of a lithium secondary cell at high production yield and with high work effici...