物理方法活化富铈贮氢合金及其预充电

Physical activation and precharge of Ce rich hydrogen storage alloy

采用物理充氢方法活化贮氢合金， 并以此方法进行氢电极的预充电。考察了压力， 温度对合金活化的影响， 得出氢化物形成的最低阈值温度为５０ ℃。用析气法评价活化效果， 确定最佳活化条件为压力１ ．６ ＭＰａ 及温度１００ ℃， 经此条件活化的电极， 充电效率是９７ ．８７ ％ 。研究了物理方法给贮氢电极预充电的条件及预充电量衰减规律， 结果显示此法能提供较宽的工艺操作范围， 在６０ ℃和０ ．８ ＭＰａ氢气压强下进行贮氢电极的预充电， 能满足控制预充量的要求， 这对实现Ｎｉ／ ＭＨ 电池的封口化成有重要的实际意义。

The physical activation and precharge process of Ce rich hydrogen storage alloy have been proposed and the effects of temperature and pressure on the amount of hydrogen absorbed by alloy during activation process have been investigated. The threshold temperature of metal hydride formation during the activation of alloy was founded to be 50 ℃. The optimum activation condition is established as 1.6 MPa and 100 ℃, under which the charging efficiency of hydride electrode is 97. 87%. These experiments indicate the result of physical activation is parallel to that of conventional electrochemical one. Moreover, the physical precharge of hydride electrode and the diminution of precharge capacity were also investigated. The results show that physical precharge techniques make controllable precharge available and supply a broad technical operating scope when metal hydride electrode is precharged under the condition of 0.8 MPa and 60 ℃. The study has practical sense to the sealed formation of Ni/MH battery.