关键词: 贮氢电极合金, 高温, 活化性能, 自放电性能, 循环稳定性

Abstract: Electrochemical properties of the hydride alloy electrode ZrCr_(0.4)Mn_(0.2)V_(0.1)Co_(0.1)Ni_(1.2) at the different temperature have been investigated. The results showed that the alloy electrodes possessed the maximum discharge capacities 336 mAh/g and 298 mAh/g at 25 ℃ and 70 ℃ respectively. The activation process of the alloy at 70 ℃ became faster, and the alloy reached its maximum capacity in less than 4 cycles, while in 13 cycles at 25 ℃. The high rate capability increased from 55 % at 25 ℃ to 71% at 70 ℃ at 300 mA/g. It was worth noting that the alloys at 25 ℃ and 70 ℃ exhibited an excellent cycle stability. The formation of the oxide film on the alloy particle surface prohibited the dissolution of the elements of the alloy during the charging-discharging process.