Effect of Yttrium on Microstructure and Electrochemical Properties of AB5 Type La0.7-xYxCe0.3Ni3.9Co0.45Mn0.35Al0.3 Hydrogen Storage Alloy

被引：0
作者：
Sun Y. [1 ]
Luo Y. [2 ]
机构：
[1] Gansu Provincial Agricultural Vocational College, Lanzhou
[2] Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou
来源：
Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2020年 / 38卷 / 05期
关键词：
Electrochemical performance; Microstructure; Phase composition and structure; Rare earth CaCu[!sub]5[!/sub] hydrogen storage alloy;
D O I：
10.11785/S1000-4343.20200508
中图分类号：
学科分类号：
摘要：
Annealed alloys of AB5 type La0.7-xYxCe0.3Ni3.9Co0.45Mn0.35Al0.3 (x=0, 0.1, 0.2, 0.3, 0.4) were prepared by vacuum arc melting and heat treatment (1000 ℃×10 h). The effects of rare earth Y element on the microstructure, phase structure and electrochemical properties of the annealed alloy were investigated. The results of XRD and SEM electron microscopy showed that the microstructure of the annealed alloy has a matrix of CaCu5 phase and a small amount of second phase. With the increase of rare earth Y content x, the unit cell parameters a, c and unit cell volume V of the main phase decrease sequentially. Electrochemical test results show the capacity retention rate after 100 charge and discharge cycles is S100=77.6%~88.1%, and the high-rate discharge performance of the alloy electrode is HRD900=86.9%~92.7%. The addition of the Y has a significant effect on improving the cycle life of the alloy. The alloy with Y content x=0.2 has good comprehensive electrochemical performance. The cycle life after 100 charge and discharge is S100=88.1%, and the high rate discharge performance is HRD900=92.9%. The reaction kinetics of the alloy electrode is controlled by the surface charge transfer rate of the alloy and the diffusion of hydrogen in the bulk phase of the alloy. © 2020, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved.
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页码：640 / 645
页数：5
相关论文
共 12 条
[1]  
Gal L, Charbonnier V, Zhang J, Goubault L, Bernard P, Latroche M., Optimization of the La substitution by Mg in the La<sub>2</sub>Ni<sub>7</sub>, hydride-forming system for use as negative electrode in Ni-MH battery, Int. J. Hydrogen Energy, 40, 47, (2015)
[2]  
Mei X Z, Luo Y C, Zhang G Q, Kang L., Phase structure and electrochemical properties of rare earth A<sub>2</sub>B<sub>7</sub> type La<sub>1-x</sub>Sc<sub>x</sub>Ni<sub>2.6</sub>Co<sub>0.3</sub>Mn<sub>0.5</sub>Al<sub>0.1</sub> (x=0~0.5) hydrogen storage alloys, Inorganic Materials Journal, 30, 10, (2015)
[3]  
Guzik M N, Hauback B C, Yvon K., Hydrogen atom distribution and hydrogen induced site depopulation for the La<sub>2-x</sub>Mg<sub>x</sub>Ni<sub>7</sub>-H system, J. Solid State Chem, 186, 2, (2012)
[4]  
Zhao L, Luo Y C, Deng A Q, Jiang W T., Hydrogen storage and electrochemical properties of Mg-free superlattice structure A<sub>2</sub>B<sub>7</sub> La<sub>1-x</sub>Y<sub>x</sub>Ni<sub>3.25</sub>Mn<sub>0.15</sub>Al<sub>0.1</sub> alloy, Chemical Journal of Chinese Universities, 39, 9, (2018)
[5]  
Wang Y X., Effects of Y and Zr Substitution on the Structure and Electrochemical Properties of AB<sub>5</sub> Type Hydrogen Storage Alloys, (2019)
[6]  
Fan Y P, Liu B Z, Zhang B Q, Ji L Q, Wang Y G, Zhang Z., Microstructures and electrochemical properties of LaNi<sub>3.55</sub>Co<sub>0.2-x</sub>Mn<sub>0.35</sub>Al<sub>0.15</sub>Cu<sub>0.75</sub>(Fe<sub>0.43</sub>B<sub>0.57</sub>)<sub>x</sub> (x=0~0.20) hydrogen storage alloys, Mater. Chem. Phys, 138, 2-3, (2013)
[7]  
Zhao X J, Li Q, Chou K C, Liu H, Lin G W., Effect of Co substitution for Ni and magnetic-heat treatment on the structures and electrochemical properties of La-Mg-Ni-type hydrogen storage alloys [J], J. Alloys Compd, 473, 1, (2009)
[8]  
Luo L., Preparation and Properties of Ultra-Long Life Low Cobalt AB<sub>5</sub> Hydrogen Storage Alloy, (2016)
[9]  
Yang C C, Wang C C, Li M M., A start of the renaissance for nickel metal hydride batteries: a hydrogen storage alloy series with an ultra-long cycle life, J. Mater. Chem. A, 5, 3, (2017)
[10]  
Jiang W T, Luo Y C, Zhao L, Deng A Q, Zhang G Q., Effect of rare earth elements on the microstructure and electrochemical properties of R-Y-Ni system A<sub>2</sub>B<sub>7</sub> magnesium-free hydrogen storage alloy, Chinese Journal of Inorganic Chemistry, 34, 10, (2018)
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