The Dissolution Behavior Of Ni-Ni/Al Intermetallic Electrode In Li/K=62/38 Mixed Molten Carbonate

A Ni3Al intermetallic compound was added to the cathode to decrease the solubility of Ni in a Li/K eutectic molten salt The solubility of Ni/Ni3Al used as a cathode was examined by measuring the concentrations of Ni and Al ions in alkali metal carbonate The electrolyte consisted of a mixture of lithium carbonate and potassium carbonate (62Li(2)CO(3)-38K(2)CO(3)) at 650 degrees C A significant decrease in Ni precipitation was observed over a long term operation using a Ni/(4%, 7%, 10%) Ni3Al stabilized cathode Al is easily oxidized and forms an Al2O3 film on the surface This Al2O3 film can inhibit corrosion of the electrode The solubility of the Ni-Al oxidized electrodes containing Ni3Al and NiO decreased with increasing amounts of Ni3Al added and with increasing sintering temperature The solubility decreased to 1 57 ppm, which is I/10 that of the pure NiO cathode (C) 2009 Elsevier B V All rights reserved