Highly pure octacyanophthalocyaninatoiron(Ⅱ) was synthesized by the reaction between tetracyanobenzene and iron(Ⅱ) acetate in sulfolane. The charge/discharge charateristics of lithium cells with octacyanophthalocyaninatoiron(Ⅱ) cathode were studied. The capacity and the energy density based on the quantity of cathode active material were 550 mAh/g and 930 Wh/Kg, respectvely. It was found that the octacyanophthalocyaninatoiron(Ⅱ) is a promising candidate as a active cathode material for lithium secondary batteries.