The relations between the microstructure and the capacity decay rate of MLNi3.8Co0.6Mn0.55Ti0.05 alloy.: I.: Capacity decay rate measurements

The capacity decay rates of MLNi3.8Co0.6Mn0.55Ti0.05 alloys prepared using different methods were investigated by electrochemical charge-discharge cycling tests. The cycle stability of the alloy could be improved by rapid solidification of the melted alloy compared with the corresponding as-cast alloy of the same composition. The capacity decay rate could be further decreased by annealing at a lower temperature such as 673 K. However, the capacity decay rate increased to a much higher level when the quenched alloy was annealed at a higher temperature such as 1073 K. (C) 1998 Elsevier Science S.A.