Substitution effect of elements in Zr-based alloys with Laves phase for nickel-hydride battery

Nakano, Hiroaki; Wakao, Shinjiro

doi:10.1016/0925-8388(95)01733-x

Cited by 57 publications

(40 citation statements)

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“…The unit cell volume, however, barely decreased with an increase in the Nb content, as shown in Table 2, so the change in the unit cell volume will minorly contribute to the destabilization of the hydride. The χ ave value is defined by the following equation [14]:…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, at 303 K, HRD was greatly improved with increasing the Nb content. The hydrides of the Zr0.6−xTi0.4NbxNi alloy were destabilized by the electronic effect of the Nb substitution, facilitating hydrogen diffusion [14,30]. Consequently, the decay in discharge capacity with an increase in specific discharge current will be suppressed.…”

Section: Cdistotal/mahmentioning

confidence: 99%

“…Nakano et al reported that when the χ ave value for the Zr-based Laves-phase alloy increased by 0.01, the enthalpy change for the hydride formation increased by about 3 kJ mol(H 2 ) −1 [14], suggesting that the stability of hydride is sensitive to χ ave . In the present study, χ ave of the primary phase increased with the x value or the Nb content, as shown in Table 3, suggesting that the difference between χ ave of the primary phase and χ H decreased or hydrogen in the primary phase was destabilized.…”

Section: Hydrogen Storage Properies Of Thementioning

confidence: 99%

“…In addition, Nb is higher in electronegativity (χ) than Zr and Ti (χ Nb = 1.60, χ Zr = 1.33 and χ Ti = 1.54). Nakano et al reported the effect of the Nb substitution of the AB 2 -type Zr-based Zr 1−x M x (V 0.10 Ni 0.49-0.57 Mn 0.30-0.36 Co 0.05 ) 2.1 (M = Ti or Nb, 0 ≤ x ≤ 0.1) in Laves-phase alloys [14]. The difference between the average electronegativity (χ ave ) of the constituents and the χ of hydrogen (χ H = 2.20) decreased with an increase in the Ti or Nb content, leading to the destabilization of the hydrides [14].…”

Section: Introductionmentioning

confidence: 99%

“…Nakano et al reported the effect of the Nb substitution of the AB 2 -type Zr-based Zr 1−x M x (V 0.10 Ni 0.49-0.57 Mn 0.30-0.36 Co 0.05 ) 2.1 (M = Ti or Nb, 0 ≤ x ≤ 0.1) in Laves-phase alloys [14]. The difference between the average electronegativity (χ ave ) of the constituents and the χ of hydrogen (χ H = 2.20) decreased with an increase in the Ti or Nb content, leading to the destabilization of the hydrides [14]. So, the replacement of Zr and Ti with Nb will increase χ ave or decrease the difference between χ ave and χ H , which causes the destabilization of the hydrides.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Matsuyama

Takito²,

Kozuka³

et al. 2018

Metals

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Abstract:Crystal structure, pressure-composition isotherms and electrochemical properties of the Zr 0.6−x Ti 0.4 Nb x Ni (x = 0.01, 0.02, and 0.05) alloys were investigated. Their X-ray diffraction profiles demonstrated that all the Zr 0.6−x Ti 0.4 Nb x Ni alloys consisted of the primary phase with the B33-type orthorhombic structure and the secondary phase with the B2-type Ti 0.6 Zr 0.4 Ni cubic structure. Rietveld refinement demonstrated that the atomic fraction of the secondary phase increased with the Nb content. The Zr 0.6−x Ti 0.4 Nb x Ni alloys were lower in hydrogen storage capacity than the Nb-free Zr 0.6 Ti 0.4 Ni alloy due to an increase in the abundance of the secondary phase. In the charge-discharge tests with the Zr 0.6−x Ti 0.4 Nb x Ni alloy negative electrodes, all the initial discharge curves had two potential plateaus due to the electrochemical hydrogen desorption of trihydride to monohydride and monohydride to alloy of the primary phase. The total discharge capacities at 333 and 303 K for the Zr 0.58 Ti 0.4 Nb 0.02 Ni alloy negative electrode were 384 and 335 mAh g −1 , respectively, which were higher than those of the other Zr 0.6−x Ti 0.4 Nb x Ni and Zr 0.6 Ti 0.4 Ni alloy negative electrodes.

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Section: Resultsmentioning

confidence: 99%

Section: Cdistotal/mahmentioning

confidence: 99%

Section: Hydrogen Storage Properies Of Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Matsuyama

Takito²,

Kozuka³

et al. 2018

Metals

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Effect of the variation in the composition on the adsorption and desorption performance for the Zr(V_x Ni_1–x)_2+α (0 ≤ x ≤ 1; 0 ≤ α ≤ 1) family of alloys

Huang

Wang

2008

Physica Status Solidi (a)

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We have performed first‐principles calculations of cubic C15‐type Laves phase Zr(Vx Ni1–x )2+α (0 ≤ x ≤ 1; 0 ≤ α ≤ 1) alloys to understand their hydrogen storage properties. Our calculations have shown that hydrogen atoms tend to occupy 2A2B sites for these alloys. It has been found that hydrogen desorption performance for these alloys can be improved by the partial substitution of Ni for V and the partial substitution of V for Zr, which agrees with experimental results. The effect of the variation in the compositions of these alloys on the hydride formation energy is revealed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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An overview of hydrogen storage system in Ni-MH batteries

Jurczyk

Nowak

2018

Hydrogen Storage Materials

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Substitution effect of elements in Zr-based alloys with Laves phase for nickel-hydride battery

Cited by 57 publications

References 15 publications

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Effect of the variation in the composition on the adsorption and desorption performance for the Zr(V_x Ni_1–x)_2+α (0 ≤ x ≤ 1; 0 ≤ α ≤ 1) family of alloys

An overview of hydrogen storage system in Ni-MH batteries

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Substitution effect of elements in Zr-based alloys with Laves phase for nickel-hydride battery

Cited by 57 publications

References 15 publications

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Effect of the variation in the composition on the adsorption and desorption performance for the Zr(Vx Ni1–x)2+α (0 ≤ x ≤ 1; 0 ≤ α ≤ 1) family of alloys

An overview of hydrogen storage system in Ni-MH batteries

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Product

Resources

About

Effect of the variation in the composition on the adsorption and desorption performance for the Zr(V_x Ni_1–x)_2+α (0 ≤ x ≤ 1; 0 ≤ α ≤ 1) family of alloys