Modeling of metal hydride battery anodes at high discharge current densities and constant discharge currents

Gabis, I. E.; Evard, E. A.; Voyt, A.P.; Кузнецов, В. Г.; Тарасов, Б. П.; Crivello, Jean-Claude; Latroche, M.; Denys, R.V.; Hu, Weikang; Yartys, V.A.

doi:10.1016/j.electacta.2014.08.107

Cited by 12 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This results in an increased hydrogen diffusion coefficient and improved high rate dischargeability of the annealed alloy. An improvement in the electrochemical characteristics after the annealing was observed by us earlier when studying AB3 and A2B7 type alloys, and the values of specific capacitance, HRD, and cyclic stability obtained in this study are quite comparable with the data for the La-Mg-Ni alloys [39][40][41][42][43][44]. Further studies of the effect of the rare earth metals on the improved electrochemical performance of the Zr-based Laves type alloys are required to better understand the mechanism governing catalytic interaction between the main phase and the rare earth containing secondary phases, to systematically extend observations available for the multiphase Zrbased alloys doped by La, Ce, Pr or Nd [45] or Zr-based C15 type Laves phase alloys doped by 3 wt.% La [46].…”

Section: Electrochemical Propertiessupporting

confidence: 90%

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

View full text Add to dashboard Cite

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 %).

show abstract

Section: Electrochemical Propertiessupporting

confidence: 90%

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

View full text Add to dashboard Cite

show abstract

“…Recently, systematic theoretical and experimental studies of the La-Mg-Ni-based hydrogen storage alloys with super-stacking structures have been performed [9], as they are regarded as high performance negative electrode materials of the Ni-MH batteries. Liao et al [10] reported that electrochemical discharge capacity of the La 2 MgNi 9 electrode of 397 mAh/g.…”

Section: Introductionmentioning

confidence: 99%

“…Liao et al [10] reported that electrochemical discharge capacity of the La 2 MgNi 9 electrode of 397 mAh/g. Modelling of the electrochemical discharge process of the metal hydride electrode [9], allowed an optimization of the metal hydride electrodes, based on estimation of the diffusion coefficient of hydrogen and equilibrium content of H in the solid solution domain in the metal hydrides.…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…where R Σ = R solution + R surface films + R charge transfer , ΔQ is the total charge of electrode at a certain potential, l is a length that is equal to a half of the effective diameter of a metal particle (cm), as we suppose that hydrogen diffusion and transformations in the metal hydride electrode proceed according to the "shrinking core" model, which was successfully utilised for the description of the electrochemical processes in the metal hydride La 2 MgNi 9 type anodes of the metal hydride batteries [14]. In present study for l we have adopted the value 2.5×10 -3 cm.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen diffusion in La1.5Nd0.5MgNi9 alloy electrodes of the Ni/MH battery

Володин

Denys

Tsirlina

et al. 2015

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Modeling of metal hydride battery anodes at high discharge current densities and constant discharge currents

Cited by 12 publications

References 43 publications

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

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

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

Hydrogen diffusion in La1.5Nd0.5MgNi9 alloy electrodes of the Ni/MH battery

Contact Info

Product

Resources

About