POSITIVE PLATE ACTIVE MATERIAL FOR CELL, METHOD FOR PRODUCING ELECTROLYTIC MANGANESE DIOXIDE, AND CELL

A positive electrode active material for battery consisting of electrolytic manganese dioxide and a battery wherein this positive electrode active material is used, this electrolytic manganese dioxide being such that, when it is heated and the weight loss thereof is measured, the weight loss at 200 DEG C to 400 DEG C is not less than 2.7 wt%. The amount of weight lost in this temperature range is proportional to the quantity of bound waters inside the electrolytic manganese dioxide.