Abstract :
Rechargeable aerospace batteries such as nickel-cadmium (Ni-Cd) and nickel-hydrogen (Ni-H2) are subjected to a detailed physical and chemical analysis to confirm the suitability of their design, determine whether the manufacturing process is under control, and explain anomalous performance features. The results of a number of cell analyses are presented, including the variation of cadmium precharge, overcharge protection, cadmium migration, swelling, porosity, and active material utilization. The results point to a decrease in positive plate utilization with storage and decrease in negative plate utilization, and overcharge protection, and increase in cadmium migration with cycling for Ni-Cd cells. In the case of Ni-H2 cells, the positive plate active material utilization tends to be high when the plaque porosity is 75.6 to 78.8 percent
Keywords :
cadmium; chemical analysis; electrochemical electrodes; hydrogen; nickel; porosity; protection; secondary cells; space vehicle power plants; Ni-Cd; Ni-Cd batteries; Ni-H2; Ni-H2 batteries; active material utilization; anomalous performance features; cadmium migration; cadmium precharge; chemical analysis; negative plate utilization decrease; nickel-cadmium batteries; nickel-hydrogen batteries; overcharge protection; physical analysis; plaque porosity; porosity; positive plate utilization decrease; rechargeable aerospace cells; swelling; Aerospace control; Aerospace materials; Batteries; Cadmium; Chemical analysis; Composite materials; Electrodes; Particle separators; Protection; Satellites;
