【摘要】 针对电动车用大型动力 Ni/ MH电池工作温度较高的特点 ,系统地研究了 3种工作温度 (2 5℃ ,40℃和 6 0℃ )对贮氢合金 RENi3.55Mn0 .4Co0 .75Al0 .3 电化学性能的影响。研究结果表明 ,RENi3.55Mn0 .4Co0 .75Al0 .3 合金具有单一的Ca Cu5型 L a Ni5相结构 ;当工作温度从 2 5℃提高至 6 0℃时 ,合金的放氢平衡压力从 0 .0 4MPa升高至 0 .13MPa,同时放氢平台的宽度变窄 ,倾斜度增大 ,从而导致该合金的放氢量降低 ;随着温度的升高 ,合金的活化性能得到显著改善 ,但合金的最大放电容量和循环稳定性明显降低 ;而中高温 (40℃和 6 0℃ )时合金的高倍率放电性能则明显优于室温(2 5℃ )时的高倍率放电性能更多还原

【Abstract】 In view of the higher working temperature of large size Ni/ M H batteries, the effects of temperature (25 ℃, 40 ℃ and 60 ℃) on the electrochemical properties of electric vehicle ( E v). The hydrogen storage alloy RENi 3.55 Mn 0.4 Co 0.75 Al 0.3 have been investigated systematically. The results show that the alloy has a single phase CaCu 5 type LaNi 5 structure. As the operating temperature rises from 25 ℃ to 60 ℃, hydrogen equilibrium pressure of the alloy increases from 0.04 MPa to 0.13 MPa, the width of hydrogen desorption plateau decreases and the gradient increases, leading to a decline of the capacity. Higher temperatures (40 ℃～60 ℃) can improve the activation behavior and high rate dischargeability, but the discharge capacity and cycling stability decrease markedly at the same time.更多还原