董小平,杨丽颖,庞艳荣,张建,田翔,王翠表

• 1:河北大学质量技术监督学院
• 2:马钢集团南山矿业公司

摘要(Abstract)：

为了改善La-Mg-Ni-Al合金的循环稳定性,用Y部分替代合金中La元素,用真空感应熔炼与950℃完全退火处理制备了La_(0.82-x)Y_xMg_(0.18)Ni_(3.35)Al_(0.15)(x=0~0.45)合金。采用XRD分析了合金的相结构,并测试了其电化学性能,分析了Y含量对合金相结构及电化学性能的影响。结果表明,Y部分替代La后,合金相结构除了主相LaNi_5、(La,Y,Mg)_2(Ni,Al)_7外,还有Ni_3Y相,Y元素导致主相晶胞体积减小。与不含Y合金相比,含Y合金的电化学性能相对较好。合适的Y含量替代改善合金电极的电化学性能,在本实验研究范围内,Y含量为0.25时的合金具有相对较大的放电容量,Y含量为0.35时的合金具有相对较好的循环稳定性。

关键词(KeyWords)： Y含量;La-Mg-Ni-Al合金;相结构;电化学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51371094);; 河北大学实验中心开放项目(sy2015091)

作者(Author): 董小平,杨丽颖,庞艳荣,张建,田翔,王翠表

DOI: 10.13289/j.issn.1009-6264.2017.01.004

参考文献(References)：

• [1]张羊换,杨泰,吴征洋,等.RE(RE=Nd,Sm,Pr)部分替代La对A2B7型合金电化学贮氢性能的影响[J].稀有金属,2015,39(1):1-10.ZHANG Yang-huan,YANG Tai,WU Zheng-yang,et al.Electrochemical hydrogen storage performance of A2B7-type electrode alloys with partial substitution of RE(RE=Nd,Sm,Pr)for La[J].Chinese Journal of Rare Metals,2015,39(1):1-10.
• [2]Zhang L,Wen K D,Han S M,et al.Study on solid solubility of Mg in Pr3-xMgxNi9and electrochemical properties of Pu Ni3-type single-phase RE-MgNi(RE=La,Pr,Nd)hydrogen storage alloys[J].Electrochimica Acta,2015,173:200-208.
• [3]Li P,Hou Z H,Shang H W,et al.Structure and electrochemical hydrogen storage characteristics of the as-cast and annealed La0.8-xSmxMg0.2Ni3.15Co0.2Al0.1Si0.05(x=0-0.4)alloys.[J].Journal of Rare Earth,2012,30(7):696-704.
• [4]董小平,杨丽颖,李小亭,等.退火方式对La0.75Mg0.25Ni3.44Co0.2Al0.03Ti0.03合金的电化学性能影响[J].材料热处理学报,2010,31(1):80-85.DONG Xiao-ping,YANG Li-ying,LI Xiao-ting,et al.Influence of annealing way on electrochemical property of La0.75Mg0.25Ni3.44Co0.2Al0.03Ti0.03alloy[J].Transactions of Materials and Heat treatment,2010,31(1):80-85.
• [5]Martin M,Fommel C,Borkhart C,et al.Absorption and desorption kinetics of hydrogen storage alloys[J].Journal of Alloys and Compounds 1996;238(1/2):193-201
• [6]Denys R V,Riabov A B,Yartys V A,et al.Mg substitution effect on the hydrogenation behaviour,thermodynamic and structural properties of the La2Ni7-H(D2)system[J].Journal of Solid State Chemistry,2008,181(4):812-821
• [7]Liu J J,Han S M,Li Q,et al.Effect of Pr on phase structure and cycling stability of La-Mg-Ni-based alloys with A2B7-and A5B19-type superlattice structures[J].Electrochimica Acta,2015,184:257-263.
• [8]董小平,庞艳荣,王青,等.放电等离子烧结制备镧镁镍贮氢合金[J].材料热处理学报,2014,35(5):20-23.DONG Xiao-ping,PANG Yan-rong,WANG Qing,et al.La Mg Ni hydrogen storage alloy prepared by spark plasma sintering[J].Transactions of Materials and Heat Treatment,2014,35(5):20-23.
• [9]董小平,刘生龙,杨丽颖,等.熔体快淬对A2B7型La0.8Mg0.2Ni3.5Co0.2合金结构及电化学性能的影响[J].材料热处理学报,2014,35(4):1-6.DONG Xiao-ping,LIU Sheng-long,YANG Li-ying,et al.Effects of rapid quenching on structure and electrochemical performance of A2B7type La0.8Mg0.2Ni3.5Co0.2alloy[J].Transactions of Materials and Heat Treatment,2014,35(4):1-6.

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