The characteristics of the Ni/MH battery, including discharge voltage, high-rate discharge capability and charge/discharge cycle lifetime are mainly determined by the construction of the negative electrode and the composition of the hydrogen-absorbing alloy. The plate of the negative elctrode of the Ni/MH battery desicribed in this paper was made from a mixture of a cycle-treated hydrogen-absorbing alloy powder, nickel powder and plytetrafluoroethylene (PTFE). A multicomponent MmNi_4-based alloy (Mm_(0.95)Ti_(0.05)Ni_(3.85)Co_(0.45Mn_(0.35)Al_(0.35)) was used as the hydrogen-absorbing alloys. The discharge characteristics of the negative electrode, including discharge capacity, exchange current density and cycle lifetime, were studied by means of the electrochemical experiments and anlaysis in an experimental cell. The MH alloy power in the negative electrode of the battery was cycled about 10 times in a KOH electrolyte. The use of the cycle-treated MH alloy powder led to an improvement in electrocemical stability, internal resistance and cycle lifetime. The decay in discharge capacity of a sealed Ni/MH battery (AA size, 1 Ah) was about 10
展开▼
