【作者】 许剑轶； 阎汝煦； 罗永春； 张胤； 陈江平；

【Author】 Xu Jianyi~(1,2),Yan Ruxu~2,Luo Yongchun~2,Zhang Yin~1,Chen Jiangping~(2,3) (1、Rare Earth School,Inner Monglia University of Science and Technology,Baotou 014010;2、State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials,Lanzhou University of Technology,Lanzhou 730050;3、Huizhou Power Pack Co.Ltd,Huizhou 516023)

【机构】 内蒙古科技大学稀土学院； 兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室； 惠州超霸电池有限公司；

【摘要】 采用感应熔炼方法制备了La_0.75Mg_0.25Ni_3.5-xCo_x（x=0,0.25,0.75,1）四元贮氢合金,系统地研究了合金B侧Fe对Ni部分替代对合金相结构及电化学性能的影响。X衍射（XRD）分析表明,La_0.75Mg_0.25Ni_3.5-xCo_x由（La,Mg）₂Ni₇相（包括Gd₂Co₇型高温相和Ce₂Ni₇型低温相）组成。此外,随着Co元素的加入,该类合金中出现CaCu₅型LaNi5相。电化学测试表明,随Co含量的增加,合金电极活化次数增大,合金电极的最大放电容量增大,合金的最大放电容量由x=0.25时的376.53 mAh/g下降到x=1时的401.62mAh/g;合金的高倍率放电性能随着Co含量的增加而降低,当电流密度为900mA/g时,合金的高倍率放电性能由83.66%（x=0）减小到73.97%（x=1）;循环稳定性变差。更多还原

【Abstract】 The phase structure and electrochemical properties of La_0.75Mg_0.25Ni_3.5-xCo_x（x=0,0.25,0.75,1） quaternary alloys was investigated.XRD analysis shows that the La_0.75Mg_0.25Ni_3.5-xCox consists of（La,Mg）₂Ni₇ phase and LaNi₅ phases with CaCu₅ type appears when Co was added.The electrochemical analysis shows that the substitutions lead to some increase in the maximum discharge capacity and a little effect on the activation property.For the discharge current density of 900 mA/g,the high rate discharge ability （HRD） of the alloy electrodes decreases from 83.66%（x=0） to 73.97%（x=1）.The cyclic stability of alloy electrodes decrease with increasing Co content in alloys.S₁₀₀ for La_0.75Mg_0.25Ni_3.5-xCo_x are 73.77%,73.66%,72.37%and 70.00%respectively.更多还原