Characteristics of AB₃-Type Co-Free Hydrogen Storage Alloy in Low-Temperature Condition

Abstract:

In this paper, the characteristics of melted and annealed Co-free AB₃-type hydrogen storage alloys in low-temperature condition were investigated by electrochemical tests. A series of Co-free AB₃-type hydrogen storage alloys were synthesized with vacuum melting method, and be annealed by low-temperature heat treatment. The structures of alloys are simply discussed through SEM and XRD results. And discharge ability and cycle ability of alloys were tested. Experiment results indicate that characteristics of different AB₃-type hydrogen storage alloys are affected by low-temperature obviously, and heated treatment could increase the discharge capacity of hydrogen storage alloy effectively, and improve the charge-discharge stability of alloy. Furthermore, non-metal element substituted alloy shows better Low-temperature applicability due to its weak crystallization. The discharge capacity of La_0.7Mg_0.3Ni_2.9B_0.05 alloy remains 91.2% after 30 cycles at 273K. And discharge capacity of heated La_0.7Mg_0.3Ni_2.9(FeB)_0.1 alloy could reach to 250mA·g^-1.

• Periodical: Advanced Materials Research (Volume 974)
• Pages: 66-70
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.974.66
• Online since: June 2014
• Authors: Wei Li*, Min Yu Zhang, Dao Bin Mu, Tao Yang, Feng Wu
• Keywords: Co-Free AB₃-Type Hydrogen Storage Alloy, Low-Temperature, Substitution

References

[1] Yang-Huan ZHANG, Bao-Wei Li, Hui-Ping Ren, Zhong-Wang Wu, Xiao-Ping Dong and Xin-Lin Wang, Influences of the substitution of Fe for Ni on structures and electrochemical performances of the as-cast and quenched La0. 7Mg0. 3Co0. 45Ni2. 55−xFex (x = 0–0. 4) electrode alloys, J. Alloys Compd 2008; 460(1-2): 414-420.

DOI: 10.1016/j.jallcom.2007.05.056

[2] B. Liao, Y. Q. Lei , L. X. Chen, G. L. Lu, H. G. Pan, Q. D. Wang, A study on the structure and electrochemical properties of La2Mg(Ni0. 95M0. 05)9 (M = Co, Mn, Fe, Al, Cu, Sn) hydrogen storage electrode alloys, J. Alloys and Compd 2004; 376(1-2): 186-195.

DOI: 10.1016/j.jallcom.2003.12.011

[3] Xuedong Wei, Peng Zhang, Hui Dong, Yongning Liu, Jiewu Zhu, Guang Yu, Electrochemical performances of a Co-free La(NiMnAlFe)5 hydrogen storage alloy modified by surface coating with Cu, J. Alloys Compd 2008; 458(1-2): 583-587.

DOI: 10.1016/j.jallcom.2007.04.211

[4] Xuedong Wei, Sheshe Liu, Hui Dong, Peng Zhang, Yongning Liu, Jiewu Zhu, Guang Yu, Microstructures and electrochemical properties of Co-free AB5-type hydrogen storage alloys through substitution of Ni by Fe, J. Electrochimica Acta, 2007; 52(7): 2423-2428.

DOI: 10.1016/j.electacta.2006.08.067

[5] Ye H, Xia B J, Wu W Q, et al. Effect of rare earth composition on the high-rate capability and low-temperature capacity of AB5-type hydrogen storage alloys[J]. Journal of Power Source, 2002, 111: 145-151.

DOI: 10.1016/s0378-7753(02)00297-5

[6] Wu Feng, Zhang Minyu, Mu Daobin, the effect of B and Fe substitution on the structure of AB3-type Co-free hydrogen storage alloy, J. Transactions of Nonferrous Metals Society of China, 2010, 20(10).

DOI: 10.1016/s1003-6326(09)60390-3

[7] Characteristics before and after heat treatment of Co-free AB3-type Fe substituted hydrogen storage alloys used for Ni-MH batteries, J. Advanced Materials Research, 2010, 129-131: 1049-1054.

DOI: 10.4028/www.scientific.net/amr.129-131.1049