(1. 中南工業(yè)大學(xué)冶金物理化學(xué)與新材料研究所，長沙 410083;
2. 哈爾濱工業(yè)大學(xué)應(yīng)用化學(xué)系，哈爾濱 150001)
摘 要: 采用物理充氫方法活化貯氫合金，并以此方法進行氫電極的預(yù)充電。考察了壓力，溫度對合金活化的影響，得出氫化物形成的最低閾值溫度為50 ℃。用析氣法評價活化效果，確定最佳活化條件為壓力1.6 MPa及溫度100 ℃，經(jīng)此條件活化的電極，充電效率是97.87%。研究了物理方法給貯氫電極預(yù)充電的條件及預(yù)充電量衰減規(guī)律，結(jié)果顯示此法能提供較寬的工藝操作范圍，在60 ℃和0.8 MPa氫氣壓強下進行貯氫電極的預(yù)充電, 能滿足控制預(yù)充量的要求，這對實現(xiàn)Ni/MH電池的封口化成有重要的實際意義。
關(guān)鍵字: 貯氫合金；電極；物理活化
（1. Institute of Metallurgical Physical Chemistry and New Materials,
Central South University of Technology, Changsha 410083, P. R. China
2. Department of applied Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. China）
Abstract: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.
Key words: physical activation; hydrogen storage alloys; electrodes
