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 597.5mA · 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.
LIU Zi-li (刘子利), ZHOU Gui-bin (周桂斌), YAN Xin-chun (闫新春), LIU Xi-qin (刘希琴)
. Effect of La Addition on Electrochemical Properties of
Amorphous LaMg11Zr+200Ni Alloy[J]. Journal of Shanghai Jiaotong University(Science), 2012
, 17(3)
: 291
-296
.
DOI: 10.1007/s12204-012-1271-3
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