MANUFACTURE OF THERMO-BATTERY AND POSITIVE-ELECTRODE ACTIVE MATERIAL FOR THERMO-BATTERY

摘要

PURPOSE:To raise the internal temperature of a battery to a high temperature region and lengthen duration during high-efficiency discharge by containing 3-15wt.% molybdenum formed as molybdenum sulfide in positive-electrode active material. CONSTITUTION:An element battery 4 is constituted by a positive electrode layer 1, a negative electrode layer 2 and an electrolytic layer 3 and the positive electrode layer 1 has molybdenum sulfide with the mixture ratio of molybdenum being 3-15wt.% contained in iron disulfide as positive-electrode active material. Accordingly, as discharge reaction proceeds on, molybdenum metal is produced in positive-electrode combining agent, however the production of the molybdenum metal first occurs in the vicinity of a positive-electrode collector where the discharge reaction proceeds therefore to cover the face in contact with the iron disulfide of the collector, so that the deterioration of the iron disulfide due to reaction on the collector, caused in a high temperature region, can be prevented. As the produced molybdenum metal has better electronic conductivity than iron, collective resistance can be also reduced during high-efficiency discharge and short circuit resulting from the occurrence of dendrite is hardly caused. It is thus possible to raise the internal temperature of a battery to a high temperature region and lengthen duration during high-efficiency discharge.