Journal ArticleDOI
Hydrogen absorption-desorption characteristics of MmNiAlM and MmNiMnM alloys (Mm misch metal)
TLDR
In this paper, the authors studied the hydrogen absorption-desorption characteristics of multicomponent alloys such as MmNi5−xAl(Mn)y−zMz and MnNi5 −xMnyM2.Abstract:
In order to reduce the large hysteresis effect in MmNi hydrides (Mm misch metal) we studied the hydrogen absorption-desorption characteristics of multicomponent alloys such as MmNi5−xAl(Mn)y−zMz and MmNi5−xAl(Mn)yM2 (M = Co, Cr, Cu, Nb, Ti, V, Zr; x = 0.3 − 0.5; y = 0.3 − 0.5; z = 0.05 − 0.1). The substitution or addition of the element M eliminates the large hysteresis effect that occurs during an absorption-desorption cycle. The hysteresis factor (equal to In( P a P d )) for MmNi4.7Al0.3M0.1 hydrides decreased for additives M in the following order: Zr > Co > Cr > Ti,V > Cu. Investigations of the effects of cycling showed that spalling occurred more rapidly for MmNi4.5Mn0.5 than for MmNi4.5Mn0.5Zr0.005 and MmNi4.5Mn0.5Zr0.1.read more
Citations
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Rechargeable hydrogen batteries using rare-earth-based hydrogen storage alloys
TL;DR: In this article, a columnar structure was formed so that the c -axis of the hexagonal structure was oriented parallel to the cooling plane, and the cylindrical sealed cell also showed a very long cycle life (a capacity decay of 6% after 2000 cycles).
Journal ArticleDOI
Hydrogen storage characteristics of Ti–Zr–Cr–V alloys
TL;DR: In this paper, the crystal structures, the lattice parameters and the characteristics of hydrogen storage at 303 K have been investigated in ternary alloys of the Ti-Cr-V system.
Journal ArticleDOI
Hydrogen storage for off-grid power supply
TL;DR: In this paper, the authors explored the technical issues surrounding the use of hydrogen storage, in conjunction with a PEM electrolyser and PEM fuel cell, to guarantee electricity supply when the energy source is intermittent, most typically solar photovoltaic.
Journal ArticleDOI
Rare-earth-based alloy electrodes for a nickel-metal hydride battery
TL;DR: In this article, a low-cost negative battery electrode for MmNi-5-based alloys (Mm, mischmetal) was proposed and induction-melting tests showed that the surface region with a columnar structure had a longer cycle lifetime than the inner region with an equiaxed structure.
Journal ArticleDOI
R&d on metal hydride materials and Ni-MH batteries in Japan
TL;DR: The production of small-sized Ni-MH batteries, which amounts to some 40% of market share for portable appliances, is still growing because of an increase in the energy density per volume and also a reduction in price.
References
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Journal ArticleDOI
Engineering properties of metal hydrides
E.L. Huston,G.D. Sandrock +1 more
TL;DR: In this article, the authors bring together engineering properties for three classes of hydride-forming alloys (AB, AB5 and A2B) manufactured and marketed by Ergenics under the HY-STOR trade name.
Journal ArticleDOI
Hydrogen absorption-desorption characteristics of mischmetal-nickel-aluminum alloys
TL;DR: The hydrogen absorption and desorption characteristics of mischmetal (Mm)-nickel-aluminum alloys were investigated in this paper, where the same hexagonal structure as LaNi5 and MmNi5 was found to react readily with hydrogen to form the hydrides MnNi4.5Al0.75 Al0.5A10.
Journal ArticleDOI
Development of mischmetal-nickel and titanium-cobalt hydrides for hydrogen storage
TL;DR: In this paper, the authors studied the hydrogen absorption-desorption characteristics of ternary alloys such as Mm1−x AxNi5 (A Ca, Ti; x = 0.05− 0.75), MmNi5−yBy (B ǫ, Co, Cr, Mn, V, V; x= 0.1−0.75).
Journal ArticleDOI
Hydrogen absorption-desorption characteristics of misch metal-nickel-silicon alloys
TL;DR: The hydrogen absorption and desorption characteristics of misch metal-nickel-silicon alloys were investigated in this article, where the same hexagonal structure as LaNi5 and MmNi5 was used to form the hydrides MmNis5−ySiy.
Journal ArticleDOI
Hysteresis effects in cerium-containing LaNi5-type compounds☆
D Dayan,M.H Mintz,M.P. Dariel +2 more
TL;DR: In this article, pressure-composition and X-ray diffraction techniques were used to study the absorption plateau pressure in the (La,Ce)Ni 5 -type hydride in the course of a hydrogenation cycle and showed that the formation of this greatly expanded phase favored the reversion of cerium to the trivalent state.