AB_3型LaMg_2Ni_(9-x-y-z)Co_xMn_yCu_z储氢合金的制备及电化学性能研究  

Preparation and Electrochemical Property of AB_3 Type LaMg_2Ni_(9-x-y-z)Co_xMn_yCu_z Hydrogen Storage Alloys

作　　者：樊星[1] 韩选利[1] 齐白羽[2] 

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]西北矿冶研究院,甘肃白银730900

出　　处：《稀有金属材料与工程》2011年第6期1025-1028,共4页Rare Metal Materials and Engineering

摘　　要：根据正交试验方案,采用共沉淀还原扩散法制备LaMg2Ni9-x-y-zCoxMnyCuz(x=1.8,2.1,2.4,2.7,3.0;y=2.1,2.4,2.7,3.0,3.3;z=0.3,0.6,0.9,1.2,1.5)系列AB3型稀土基储氢合金,研究该系列合金的放电容量和循环稳定性,并用X射线衍射对产物的结构进行微观分析。结果表明:3元素同时替代时合金的放电容量均高于单元素替代时合金的放电容量,但循环稳定性有所下降。合金结构分析表明,合金主相为La4Co3相。该系列合金中LaMg2Ni2.7Co2.1Mn2.7Cu1.5合金电极表现出的综合电化学性能较优。AB3 type LaMg2Ni9-x-y-zCoxMnyCuz（x=1.8,2.1,2.4,2.7,3.0;y=2.1,2.4,2.7,3.0,3.3;z=0.3,0.6,0.9,1.2,1.5） hydrogen storage alloys were synthesized by a coprecipitation-reduction-diffusion method according to the orthogonal experimental design.Their discharge capacity and cycle stability were studied and the structure was analyzed by XRD.The results indicate that the maximum discharge capacity of the series of alloys under multielement substitution is higher than the alloys under single element substitution,but the cycle stability decline slightly.Structure analyses show that the main phase of alloys is La4Co3.LaMg2Ni2.7Co2.1Mn2.7Cu1.5 alloy shows the best electrochemical properties in the series of hydrogen storage alloys.

关 键 词：AB3型储氢合金 共沉淀还原扩散法 多元素替代 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程] O614.33[金属学及工艺—合金]