Phase-structural transformations in a metal hydride battery anode La1.5Nd0.5MgNi9 alloy and its electrochemical performance

Володин, А. А.; Wan, Chubin; Denys, R.V.; Tsirlina, Galina A.; Тарасов, Б. П.; Fichtner, Maximilian; Ulmer, Ulrich; Yu, Yingda; Nwakwuo, Christopher C.; Yartys, V.A.

doi:10.1016/j.ijhydene.2016.01.089

Cited by 38 publications

(12 citation statements)

References 48 publications

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“…Thus, replacement of La by other RE together with optimization of Mg content [31] provides complementary possibilities to improve the alloys. Nd-doped La 2 MgNi 9 showed a better performance at high current densities [13,28].…”

Section: Introductionmentioning

confidence: 96%

“…The general regularities of their interaction with hydrogen and properties of the metal hydrides have many common features. Recently, our group [28] found that with a partial substitution of Nd for La, the formed La 1.5 Nd 0.5 MgNi 9 alloy was composed of PuNi 3 -type phase only, and showed improvement in the cycling stability and high rate dischargeability. Changes in hydrogen diffusion rate in the La 1.5 Nd 0.5 MgNi 9 anode appeared to be related to the changes in hydrogen content [29].…”

Section: Introductionmentioning

confidence: 99%

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In operando neutron diffraction study of LaNdMgNi9H13 as a metal hydride battery anode

Nazer

Denys

Yartys

et al. 2017

Journal of Power Sources

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La 2 MgNi 9 -related alloys are superior metal hydride battery anodes as compared to the commercial AB 5 alloys. Nd-substituted La 2-y Nd y MgNi 9 intermetallics are of particular interest because of increased diffusion rate of hydrogen and thus improved performance at high discharge currents. The present work presents in operando characterization of the LaNdMgNi 9 intermetallic as anode for the nickel metal hydride (Ni-MH) battery. We have studied the structural evolution of LaNdMgNi 9 during its charge and discharge using in situ neutron powder diffraction. The work included experiments using deuterium gas and electrochemical chargedischarge measurements. The alloy exhibited a high electrochemical discharge capacity (373 mAh/g) which is 20 % higher than the AB 5 type alloys. A saturated β-deuteride synthesized by solid-gas reaction at P D2 = 1.6 MPa contained 12.9 deuterium atoms per formula unit (D/f.u.) which resulted in a volume expansion of 26.1%. During the electrochemical charging, the volume expansion (23.4%) and D-contents were found to be slightly reduced. The reversible electrochemical cycling is performed through the formation of a two-phase mixture of the solid solution and -hydride phases. Nd substitution contributes to the high-rate dischargeability, while maintaining a good cyclic stability. Electrochemical Impedance Spectroscopy (EIS) experiments showed a decreased hydrogen transport rate during long-term cycling.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

In operando neutron diffraction study of LaNdMgNi9H13 as a metal hydride battery anode

Nazer

Denys

Yartys

et al. 2017

Journal of Power Sources

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“…Such a behavior is typical for all hydride-forming alloys [35]. Nevertheless, the obtained maximal values of D are somewhat higher as compared with the AB3 based hydrides (for example, 2.87×10 −11 cm 2 /s for La1.5Nd0.5MgNi9) [37] and AB5 based hydrides (1.81×10 −10 cm 2 /s for MmNi4.25Mn0.25Co0.45Al0.3) [38] type alloys.…”

Section: Hydrogen Diffusion Propertiesmentioning

confidence: 66%

“…Hydrogen diffusion coefficient was calculated according to a modified Cottrell Equation (see [36,37] for the details):…”

Section: Hydrogen Diffusion Propertiesmentioning

confidence: 99%

Study of hydrogen storage and electrochemical properties of AB2-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy

Володин

Denys

Wan

et al. 2019

Journal of Alloys and Compounds

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A C15 AB2 Laves-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy was prepared by arc melting and annealing. Phase-structural composition, microstructure, hydrogen absorption-desorption properties, thermodynamic and electrochemical performances were characterized by X-ray diffraction, scanning electron microscopy, hydrogen absorption-desorption measurements and electrochemical characterization and were related to the use of the alloys as metal hydride battery anodes.The alloy contains a C15 FCC intermetallic compound as the main phase and a LaNi secondary phase as the minor constituent (~ 1 wt.%).During the electrochemical tests, the anode electrodes quickly, after just a few activation cycles, reached a maximum discharge capacity. This was related to the catalytic effect of the La-rich secondary phase which acted as a catalyst of hydrogen absorption-desorption.Annealing resulted in increase of the maximum discharge capacity from 345 mAh/g for the as cast alloy to 370 mAh/g. Furthermore, the annealed alloy showed a better high rate dischargeability and a higher cyclic stability. After 100 cycles with 100% DOD at discharge current density of 1 C, the discharge capacity of the annealed alloy was very high, at a level of 90 % of the initial capacity.The rates of hydrogen diffusion have been characterized by Potentiostatic Intermittent Titration Technique and Electrochemical Impedance Spectroscopy. With increasing an extent of transformation into the hydride, the H diffusion rate in the bulk of the alloy particles decreased. The maximum value of DH measured by PITT for the annealed alloy was observed for the nearly fully discharged electrode, (SOC 2 %).

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“…It is also possible to improve the electrochemical parameters by combining two or more rare-earth metals (La, Ce, Nd, Pr). For example, the introduction of neodymium into the alloy can increase the resistance to oxidation, increase the exchange rate of the hydrogen reaction, as well as the rate of diffusion of hydrogen in the alloy [8]. One of the key problems in the work of anode materials is the delivery of electrons to the collector.…”

Section: Anode Materialsmentioning

confidence: 99%

Advanced Materials for Nickel—Metal Hydride Chemical Power Sources

Володин¹,

Тарасов²,

Blinov³

2019

dteees

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A general survey on Ni-MH power sources is given, their advantages and disadvantages are shown, and the reported experimental data for improving their performance are summarized. The prospect of using carbon nanostructures to improve the performance of electrodes is considered and the effectiveness of their use is shown. The resulting materials can be used to produce electrodes for Ni-MH batteries and metal hydride fuel cells.

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Phase-structural transformations in a metal hydride battery anode La1.5Nd0.5MgNi9 alloy and its electrochemical performance

Cited by 38 publications

References 48 publications

In operando neutron diffraction study of LaNdMgNi9H13 as a metal hydride battery anode

In operando neutron diffraction study of LaNdMgNi9H13 as a metal hydride battery anode

Study of hydrogen storage and electrochemical properties of AB2-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy

Advanced Materials for Nickel—Metal Hydride Chemical Power Sources

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