抄録
Recently, to suppress the Nickel dissolution from the NiO cathode, Li/Na carbonate tends to be used as the electrolyte of molten carbonate fuel cells instead of Li/K carbonate. With Li/Na carbonate electrolyte, due to the higher ionic conductivity and the lower solubility of NiO, the decay rate of the stacks is expected to decrease. The single cell with Li/Na was operated over 12, 000 hours, resulting that the decay rate of the stack was presumed 3 mV/1000 hours. This value is less than that of the stack with Li/K carbonate, 4.5 mV/1000 hours. This presumption was agreed with that of the decay rate of the stack with Li/Na electrolyte operated over 6000 hours. Moreover, the effect of the electrolyte loss rate on the performance decay was deducted. The performance decay of 1.8 mV/1000 hours was expected for the stack equiped both with Li/Na carbonate and the advanced cathode current collector (slit firm type).
