为了改善A2B7型La0.8 Mg0.2Ni3.5Co0.2合金的电化学性能,采用熔体快淬技术制备了合金.用XRD、SEM分析了合金的微观结构,用电化学方法测试了合金的电化学性能.结果表明,快淬后,合金具有多相结构,包括两个主相(La,Mg) Ni5及(La,Mg)2(Ni,Co)7和残留相LaNi2.28相,快淬使合金的微观应变增加,柱状晶区域面积较大,合金的晶粒明显细化.快淬使合金的放电容量、平台中值电压降低,电化学循环稳定性提高.
参考文献
| [1] | Hiroshi Hayakawa;Etsuo Akiba;Midori Gotoh .Crystal Structures of La-Mg-Ni_x (x = 3-4) System Hydrogen Storage Alloys[J].Materials transactions,2005(6):1393-1401. |
| [2] | 董小平,杨丽颖,王青,朱凯宁,王涛,王翠表.热处理后La0.80Mg0.20Ni3．70合金循环容量衰减的机理[J].材料热处理学报,2012(12):19-24. |
| [3] | Huiping Yuan;Zhiyuan Zou;Zhinian Li;Jianhua Ye;Xiumei Guo;Lijun Jiang;Shumao Wang;Xiaopeng Liu .Effect of particle size on the performance of rare earth-Mg-Ni-based hydrogen storage alloy electrode[J].International journal of hydrogen energy,2013(19):7881-7887. |
| [4] | Jiang W Q;Qin C S;Zhu R R et al.Annealing effect on hydrogen storage property of Co-free LaL8Ti0.2MgNi8.7Al0.3 alloy[J].Journal of Alloys and Compounds,2013,565:37-43. |
| [5] | Wei-Kang Hu;Roman V. Denys;Christopher C. Nwakwuo;Thomas Holm;Jan Petter Maehlen;Jan Ketil Solberg;Volodymyr A. Yartys.Annealing effect on phase composition and electrochemical properties of the Co-free La_2MgNi_9 anode for Ni-metal hydride batteries[J].Electrochimica Acta,2013:27-33. |
| [6] | Chengyuan Ni;Huaiying Zhou;Nianlei Shi;Zhongmin Wang.Electrochemical performances of Mm_(0.7)Mg_xNi_(2.58)Co_(0.5)Mn_(0.3)Al_(0.12) (x = 0, 0.3) hydrogen storage alloys in the temperature range from 238 to 303 K[J].Electrochimica Acta,2012:237-244. |
| [7] | 崔大田,王志法.快速凝固新型Au-Ag-Ge合金薄带的制备[J].材料热处理学报,2010(01):40-43. |
| [8] | 向青春,周彼德,李荣德.快速凝固过程中熔液自旋工艺的比较[J].特种铸造及有色合金,2000(03):46-49. |
| [9] | 崔忠祈;谭耀春.金属学与热处理[M].北京:机械工业出版社,2013:01. |
| [10] | Wu, Z.;Yang, F.;Bao, Z.;Nyamsi, S.N.;Zhang, Z..Improvement in hydrogen storage characteristics of Mg-based metal hydrides by doping nonmetals with high electronegativity: A first-principle study[J].Computational Materials Science,2013:83-90. |
| [11] | Yongfeng Liu;Yanhui Cao;Li Huang .Rare earth-Mg-Ni-based hydrogen storage alloys as negative electrode materials for Ni/MH batteries[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2011(3):675-686. |
| [12] | Nakano H;Wakao S;Shimizu T .Correlation between crystal structure and electrochemical properties of C14 Laves-phase alloys[J].Journal of Alloys and Compounds,1997,253-254:609-612. |
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