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Sn替代Ni对R-Mg-Ni基合金结构和电化学性能的影响 被引量:4

Structure and Electrochemical Properties of R-Mg-Ni-Based Alloys with Sn Substitution for Ni
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摘要 采用元素替代的方法,研究了Sn元素部分替代Ni元素对La0.72Nd0.08Mg0.2Ni3.4-xSnxAl0.1(x=0-0.14)电极合金结构和电化学性能的影响。通过感应熔炼、退火处理、粉碎过筛后得到合金样品。X射线衍射(XRD)分析表明该合金为多相结构,包括(La,Mg)2Ni7(Gd2Co7型和Ce2Ni7型)、(La,Mg)5Ni19(Pr5Co19型)、(La,Mg)Ni3(Pu Ni3型)和La Ni5相(Ca Cu5型)。结构精修显示合金主相由Gd2Co7型(La,Mg)2Ni7相依次变化为(La,Mg)5Ni19,La Ni5相。恒电流充放电测试表明,合金放电容量最大值为387.4 m Ah·g-1。加入Sn后合金电极的放电容量下降,这与合金中相含量的变化是有关系的。Sn的加入导致合金中高吸氢相(La,Mg)2Ni7相的减少,而吸氢能力相对小的(La,Mg)5Ni19相和La Ni5相含量不断增加。高倍率放电测试表明随着Sn元素加入,高倍率放电性能下降。电化学循环稳定性测试表明随着Sn元素含量的增加,合金电极循环寿命先增加后下降。当Sn含量x=0.06时,在100次电化学循环后放电容量保持率达到最高水平83.8%。 With the method of element substitution, the effects of Sn substitution for Ni on the structure and electrochemical property of La0.72Nd0.08Mg0.2Ni3.4-xSnxAl0.1(x=0-0.14) electrode alloys were investigated. Alloy samples were prepared by induction melt- ing, annealing, pulverization and sieving. X-ray diffraction (XRD) analysis indicated that the alloys consisted of multi-phases, inclu- ding ( La, Mg) 2 Ni7 ( Gd2 Co7, Ce2 Si7 ), ( La, Mg) 5 Ni19 ( Pr5 C019 ), ( La, Mg) Ni3 ( PuNi3 ) and LaNi5 ( CaCu5 ). Structural refine- ment indicated that the main phase varied from Gd2CoT-type (La, Mg)2Ni7 to (La, Mg)5Ni19 and LaNi5. The galvanostatic charge- discharge test indicated the maximum discharge capacity reached 387.4 mAh·g^-1 , and the discharge capacity decreased with the addi- tion of Sn, which was related with the change of phase contents. In fact, the amount of (La, Mg)2 NiT phase with good hydrogen stor- age ability deereased, and that of (La, Mg)5 Nil9 and LaNis phases with relatively worse hydrogen storage ability increased when Sn was introduced. High-rate discharge measurements indicated that the high-rate discharge ability decreased with Sn increasing. The cy- clle measurements indicated that cycle life firstly increased then decreased with the increase of Sn. When Sn content reached x = 0.06, the cyclic retention over 100 cycles was up to 83.8%.
出处 《稀有金属》 EI CAS CSCD 北大核心 2015年第6期487-492,共6页 Chinese Journal of Rare Metals
基金 宁夏自然科学基金项目(NZ14262)资助
关键词 元素替代 储氢合金 相结构 电化学性能 element substitution hydrogen storage alloy phase structure electrochemical properties
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  • 1Kadir K, Sakai T, Uehara I. Synthesis and structure determination of a new series of hydrogen storage alloys : RMg2 Ni9 (R = La, Ce, Pr, Nd, Sm and Gd) built from MgNi2 Laves-type layers alternating with AB5 layers [J]. J. Alloys Compd., 1997, 257 (1-2): 115.
  • 2Kohno T, Yoshida H, Kawashima F, Iuaba T, Sakai I, Yamamoto M, Kanda M. Hydrogen storage properties of new ternary system alloys: La2MgNi9, LasMg2Ni23, La3MgNi,, [J] J. Alloys Compd., 2000, 311 (2) : LS.
  • 3Pan H G, Liu Y F, Gao M X, Zhu Y F, Lai Y Q, Wang Q D. An investigation on the structural and elec- trochemical properties of Lao.~ Mgo.3 ( Ni0.ss Co0.15 )x (x = 3.15 -3.80) hydrogen storage electrode alloys [J]. J. Alloys Compd. , 2003, 351 (1-2) : 228.
  • 4Zhang F L, Luo Y C, Chen J P, Yan R X, Kang L, Chen J H. Effect of annealing treatment on structure and deetrochemical properties of lmo.67Mgo.zxNizsCo0.5 alloy electrodes [J]. J. Power Sources, 2005,150: 247.
  • 5黄林军,王彦欣,唐建国,吴东昌,王瑶,刘继宪.镁基非晶电极合金的容量衰减机制探讨[J].稀有金属,2013,37(1):14-20. 被引量:2
  • 6Zhang X B, Sun D Z, Yin W Y, Chai Y J, Zhao M S. Effect of La/Ce ratio on the structure and electrochemical characteristics of Lao.7_x Ce, Mg0.3 Ni2.s Co0.s ( x = 0. 1 - O. 5 ) hydrogen storage alloys [ J ]. Electrechim Acta, 2005, 50(9) : 1957.
  • 7Liu Y F, Pan H G, Gao M X, Miao H, Lei Y Q, Wang Q D. Function of AI on the cycling behavior of the La- Mg-Ni-Co-type alloy electrodes I J]. Int. J. Hydrogen Energy, 2008, 33(1): 124.
  • 8Zhang X B, Sun D Z, Yin W Y, Chai Y J, Zhao M S.Effect of Mn content on the structure and electrochemical characteristics of La0.7 Mgo. 3 Ni2.975 - x Coo. 525 Mnx ( x = 0 0.4) hydrogen storage alloys [ J 1- Electrochim Acta, 2005, 50(14): 2911.
  • 9Liao B, Lei Y Q, Chen L X, Lu G L, Pan H G, Wang Q D. A study on the structure and electrochemical properties of La2Mg( Ni0.95 Mo.05 )9 ( M = Co, Mn, Fe, A1, Cu, Sn) hydrogen storage electrode alloys [ J ]. J. Alloys Compd. , 2004, 376(1-2) : 186.
  • 10Gao Z J, Luo Y C, Lin Z, Li R F, Wang J Y, Kang L. Effect of Co substitution for Ni on the microstructure and electrochemical properties of La-R-Mg-Ni-hased hydro- gen storage alloys [ J ]. J. Solid State Electrochem. , 2013,17 (3) : 727.

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