Pr元素对La-Nd-Mg-Ni系贮氢合金相结构和电化学性能的影响  

Effect of Pr on phase structure and electrochemical properties of La-Nd-Mg-Ni-based hydrogen storage alloys

作　　者：李媛[1] 杨淑琴[1] 王建青[2] 李中秋 韩树民[1,2] 

机构地区：[1]燕山大学环境与化学工程学院,河北秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004 [3]秦皇岛市环境保护监测站,河北秦皇岛066001

出　　处：《燕山大学学报》2013年第1期75-80,共6页Journal of Yanshan University

基　　金：国家自然科学基金资助项目(51171165);河北省自然科学基金资助项目(B2012203027,B2012203104);秦皇岛科技支撑计划资助项目(2012021A068)

摘　　要：为了研究Pr元素对La-Nd-Mg-Ni系贮氢合金相结构和电化学性能的影响,采用感应熔炼法制备了La0.20Nd0.60 Pr Mg0.20Ni3.20Co0.20Al0.20(=0,0.10,0.20,0.30,0.40)合金。XRD分析表明,合金的主相为CaCu5型的LaNi5相和Ce2Ni7型的La2Ni7相。随着的增大,两相的晶胞体积均增大,并且La2Ni7相的含量显著增加。P-C-T曲线表明,随着Pr含量的增加,合金氢化物的稳定性增强。电化学测试结果显示,随着Pr含量的增加,合金电极的高倍率放电性能、低温放电性能和循环稳定性均先提高后降低,其中100周循环容量保持率从76.7%(=0)增加到88.7%(=0.30),然后又降低到82.3%(=0.40)。To investigate effect of rare earths on phase structure and electrochemical properties of La-Nd-Mg-Ni-based hydrogen storage alloys,La0.20NdPrMg0.20Ni3.20Co0.20Al0.20（0,0.10,0.20,0.30,0.40） alloys are prepared by inductive melting.XRD results show that main phases of the alloys are CaCu5-type LaNi5 phase and Ce2Ni7-type La2Ni7 phase.As increases,the cell volume of the two phases increases and the content of La2Ni7 phase increases.P-C-T profiles show that stability of the hydrides increases with increasing Pr content.Electrochemical tests show that high rate dischargeability,low temperature dischargeability and cycling stability increases first and then decreases with increasing Pr content.The capacity retention rate at the 100th cycle increases from 76.7%（） to 88.7%（0.30）,and then decreases to 82.3%（0.40）.

关 键 词：镍-金属氢化物电池 贮氢合金 La-Nd-Mg-Ni系合金 相结构 电化学性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]