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Effect of La addition on electrochemical properties of amorphous LaMg11Zr+200Ni alloy

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Abstract

The effect of La addition on the structure and electrochemical properties of amorphous LaMg11Zr+200Ni (LaMg11Zr: Ni = 1: 2, m: m) hydrogen storage alloy prepared by mechanical alloying was investigated systematically. The results show that the alloys have an amorphous structure after 20 h ball-milling and the particles are significantly refined with the addition of La. The electrochemical tests indicate that the charging resistance of the alloy electrodes decreases with the addition of La. The maximum discharge capacity of the alloy electrodes increases with the increase of La addition, while the cyclic stability and high-rate discharge performance increase firstly and then decrease as the La content increases. When the mass fraction of La is up to 5%, the maximum discharge capacity after charging/discharging of 30 cycles of the alloy electrode is increased from 576.2 to 597.5 mA· h/g, and the capacity retention rate and high-rate dischargeability (HRD) of the alloy electrode are increased by 20.5% and 29.4% respectively compared with those of the alloy electrode without the La addition, exhibiting the best comprehensive electrochemical performances.

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Authors and Affiliations

  1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Zi-li Liu  (刘子利), Gui-bin Zhou  (周桂斌), Xin-chun Yan  (闫新春) & Xi-qin Liu  (刘希琴)

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  1. Zi-li Liu  (刘子利)
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  2. Gui-bin Zhou  (周桂斌)
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  3. Xin-chun Yan  (闫新春)
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  4. Xi-qin Liu  (刘希琴)
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Correspondence to Zi-li Liu  (刘子利).

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Foundation item: the Key Technologies Research and Development Program of Jiangsu Province (No. BE2010103)

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Liu, Zl., Zhou, Gb., Yan, Xc. et al. Effect of La addition on electrochemical properties of amorphous LaMg11Zr+200Ni alloy. J. Shanghai Jiaotong Univ. (Sci.) 17, 291–296 (2012). https://doi.org/10.1007/s12204-012-1271-3

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  • DOI: https://doi.org/10.1007/s12204-012-1271-3

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