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| Phase Structure and Electrochemical Properties of La--Mg--Ni System AB3 Type Hydrogen Storage Electrode Alloys |
| LIAO Bin; LEI Yongquan; Lü Guanglie;CHEN Lixin; GE Hongwei; PAN Hongge |
| Department of Materials and Engineering; Zhejiang University; Hangzhou 310027 |
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Cite this article:
LIAO Bin; LEI Yongquan; Lü Guanglie; CHEN Lixin; GE Hongwei; PAN Hongge. Phase Structure and Electrochemical Properties of La--Mg--Ni System AB3 Type Hydrogen Storage Electrode Alloys. Acta Metall Sin, 2005, 41(1): 41-.
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Abstract XRD Rietveld analysis shows that LaxMg3-xNi9
(x=1.0---2.3) alloys consist of a main phase with
hexagonal PuNi3-type structure and a few impurity phases
(mainly LaNi5 and MgNi2, increasing
x leads to an increase in both
the lattice parameters and the unit cell volume of the main
phase. The hydride of the alloys preserves the PuNi3
type structure, but shows a large unit cell volume
expansion. The electrochemical measures indicate
that the desorption plateau pressure Prm of the
alloys decreases noticeably as x increases, while
the maximum discharge capacity Cmax
increases from 88.3 (x=1.0) to
397.5 (x=2.0),
and then decreases to 230 mA.h/g
(x=2.3). For the alloys
with Cmax>348 mA.h/g (x=1.7-2.2),
the high-rate
dischargeability (HRD) of the electrodes at i=400-1200 mA/g
decreases with increaseing x. The slower decrease of HRD
is mainly attributed to the decrease of
eletrocatalytic activity due to the
charge--transfer reaction, and the more rapid
decrease of HRD of the alloys with $x>$2.0 is
related to the lower hydrogen diffusion rate in the
bulk of alloy. The rate of capacity retention
(S100) of the alloys after 100 charge/ discharge
cycles is around 55.7%-62.9%, the rather fast
cycling capacity degradation is
mainly due to the corrosion of La and Mg and the large
unit cell volume expansion in the hydride phase.
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Received: 13 January 2004
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