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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
Aiming at the high operating temperature of large-power Ni / MH battery for electric vehicle, the effects of three operating temperatures (25 ℃, 40 ℃ and 60 ℃) on the hydrogen storage alloy RENi3.55Mn0 .4Co0 .75Al0.3 Electrochemical properties of the impact. The results show that, RENi3.55Mn0 .4Co0 .75Al0. 3 alloy has a single Ca Cu5 type L a Ni5 phase structure; when the working temperature from 25 ℃ to 60 ℃, the equilibrium pressure of hydrogen desorption alloy from 0 .0 4MPa increased to 0.13MPa, at the same time, the width of the hydrogen releasing platform became narrower and the inclination increased. As a result, the hydrogen desorption capacity of the alloy decreased. With the increase of the temperature, the activation performance of the alloy was significantly improved. However, The maximum discharge capacity and cycle stability were significantly reduced. However, the high-rate discharge performance of the alloy at 40 ℃ and 60 ℃ was significantly better than that at room temperature (25 ℃)