A new family of hydride electrode materials based on CaNi5-type alloys

Li, Z.P.; Suda, S.

doi:10.1016/0925-8388(95)01712-7

Cited by 10 publications

(5 citation statements)

References 4 publications

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“…As La‐based compounds are very expensive, in‐depth research should be carried out to replace them partially or totally with other materials such as Zr, 58 Pr, 59 Nd, 60 Ca, 61 Mm, 62 and Ce 63 . Many studies opted for the use of the CaNi 5 compound because of its low cost, high discharge capacity (482 mAhg −1 ) and good kinetic properties 64,65 …”

Section: Introductionmentioning

confidence: 99%

“…63 Many studies opted for the use of the CaNi 5 compound because of its low cost, high discharge capacity (482 mAhg À1 ) and good kinetic properties. 64,65 The CaNi 5 electrode is characterized by its excellent hydrogen storage capacity and limited cycling stability which degrades the former after only 200 cycles. 66 It was demonstrated that this addition had no remarkable effect on the poor cycling properties of electrodes.…”

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confidence: 99%

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Electrochemical properties of theCaNi₄_.₈M_0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Karaoud

Dabaki

Khaldi

et al. 2023

Env Prog and Sustain Energy

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The present research work examines the electrochemical properties of CaNi4.8M0.2(MMg, Zn) type alloy applied as an anode in nickel metal hybrid batteries. Based on an extensive study of the CaNi4.8Mn0.2 compound prepared by mecano‐synthesis; under an argon atmosphere, with a variation of milling time and weigh ratio, using a Retsch PM400 type ball mill. The experimental results show that the excellent electrochemical properties were obtained for a milling time of 40 h and a ball‐to‐powder weight ratio equal to 8:1. Based on this study, we examined electrochemically the CaNi4.8M0.2(MMg, Zn, and Mn) compound according to the optimized parameters. Several methods, such as galvanostatic polarization and potentiodynamic polarization, were applied to characterize these electrodes. CaNi4.8M0.2(MMg, Zn, and Mn) electrodes were activated, respectively, during the first, second, and third cycles. The maximum discharge capacity was about 87, 60, and 96 mAhg−1 at ambient temperature. These electrochemical findings correlate with the kinetic results provided during a long cycle.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Electrochemical properties of theCaNi₄_.₈M_0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Karaoud

Dabaki

Khaldi

et al. 2023

Env Prog and Sustain Energy

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“…Their capacity, with a lifetime of almost 1000 cycles, is equal to 360 mAh g −1 [19,20]. On the other hand, these lanthanumbased compounds have some limitations, including their higher cost than MmNi 5 or CaNi 5 compounds [21,22]. The CaNi 5 compound has attracted much attention due to its low cost and acceptable storage capacity [23,24].…”

Section: Introductionmentioning

confidence: 99%

Phase structure and electrochemical characteristics of CaNi4.7Mn0.3 hydrogen storage alloy by mechanical alloying

Dabaki

Khaldi

Elkedim

et al. 2021

J Solid State Electrochem

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In this paper, we study systematically the effect of ball/powder weight ratio on the morphological, structural, and electrochemical properties of CaNi 4.7 Mn 0.3 powder alloy by mechanical milling. The CaNi 4.7 Mn 0.3 alloy powder is elaborated for an optimal milling time of 40 h with 8:1 and 12:1 ball/powder weight ratios. The X-ray diffraction (XRD) characterization shows that the CaNi 4.7 Mn 0.3 alloy powder is characterized by a nanocrystalline/amorphous crystallographic state and exhibits two major Ni and CaNi 3 phases irrespective of the ball/powder weight ratio. The CaNi 4.7 Mn 0.3 electrode activates rapidly in the first cycle regardless of the ball/powder weight ratio, and the best value of maximum discharge capacity is obtained for an 8:1 ratio (125 mAh g −1 ). The values of diffusion coefficient/mean grain size squared ratio D H a 2 , Nernst's potential E 0 , and exchange current density I 0 at the first activation cycle are the best for 8:1 ball/powder weight ratio. After activation, the discharge capacity decreases exponentially regardless of the ball/powder weight ratio. Indeed, the capacity loss and the degradation rate after 50th cycle are about 71%, 10.71 cycle −1 and 53%, 2.95 cycle −1 for 8:1 and 12:1, respectively. The evolution of the D H a 2 ratio, E 0 , and I 0 during the cycling is in good agreement with that of the discharge capacity. The highest values of the diffusion coefficient D H , Nernst's potential E 0 , and exchange current density I 0 after 50th cycle are observed for 8:1 ball/powder weight ratio. KeywordsCaNi 4.7 Mn 0.3 hydrogen storage alloy • Mechanical alloying • Morphological and structural properties • Electrochemical properties

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“…Many studies have been carried out to reduce the cost of LaNi 5 alloys by partially or totally replacing lanthanum with calcium, the CaNi 5 alloy, whose lanthanum is totally replaced by calcium, has the same hexagonal structure of the CaCu 5 type in the P6/3m space group as the LaNi 5 original alloy. 22,23 In the last decade, a lot of research has been conducted to develop the hydrogen storage properties of the CaNi 5 alloy, including its capacity and stability by the partial substitution of the Ca by Zr 24 and Ni by Mg, 25 Mo, 26 Al, 27 Sn, Cu, Mn, Si, Cr, Zn, Fe and V. 28 The electrochemical capacity might be increased if the metal is partially substituted by bigger metal atoms, as this would generate a larger unit cell volume. 29 The substitution of Ca and Ni by Ce and Zn, respectively, modified the unit cell volume and therefore the thermodynamics of hydrogenation and the plateau pressure.…”

Section: Introductionmentioning

confidence: 99%

“…This research result is explained by the reduction of the phenomenon of decrepitating of the metallic compound containing cobalt following the expansion of the mesh volume during cycling. Many studies have been carried out to reduce the cost of LaNi 5 alloys by partially or totally replacing lanthanum with calcium, the CaNi 5 alloy, whose lanthanum is totally replaced by calcium, has the same hexagonal structure of the CaCu 5 type in the P6/3m space group as the LaNi 5 original alloy 22,23 . In the last decade, a lot of research has been conducted to develop the hydrogen storage properties of the CaNi 5 alloy, including its capacity and stability by the partial substitution of the Ca by Zr 24 and Ni by Mg, 25 Mo, 26 Al, 27 Sn, Cu, Mn, Si, Cr, Zn, Fe and V 28…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

et al. 2020

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In this article, we exhaustively examined the effects of Mn substitution for Ni on the structures and electrochemical characterization of the CaNi 5−x Mn x (x = 0.2, 0.3, 0.5, 1) alloys prepared by mechanical synthesis for 40 hours at ball to powder weight ratio of 8:1. The characterization of electrodes was examined by X-ray diffraction, scanning electron microscope and electrochemical tests. In this context, the structural properties for each alloy have two major phases Ni, Ca 2 Ni 7 ; Ni, CaNi 3 ; Ni, CaNi 5 ; Ni, CaNi 3 where x = 0.2, 0.3, 0.5 and 1 respectively. The powder micrograph shows the existence of agglomerates has average particle size between 22 and 35 μm. In addition, the quantification by energy dispersive spectroscopy has been indicated the chemical composition of the all produced alloys is near their nominal composition. All electrodes are activated during the first cycle, independent of the Mn substitution rate. The highest values of discharge capacity and reversibility are obtained for x = 0.3 (125 mAh g −1 , 0.17 V) and x = 0.5 (119 mAh g −1 , 0.19 V) despite their low cycle stability. The evolution of D H /a 2 ratio and the I 0 exchange current density for the different Mn substitution rates is in accordance with that of the evolution of discharge capacities. The better kinetic properties is observed for x = 0.5 during electrochemical cycling.

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A new family of hydride electrode materials based on CaNi5-type alloys

Cited by 10 publications

References 4 publications

Electrochemical properties of theCaNi₄_.₈M_0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Electrochemical properties of theCaNi₄_.₈M_0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Phase structure and electrochemical characteristics of CaNi4.7Mn0.3 hydrogen storage alloy by mechanical alloying

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying

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A new family of hydride electrode materials based on CaNi5-type alloys

Cited by 10 publications

References 4 publications

Electrochemical properties of theCaNi4.8M0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Electrochemical properties of theCaNi4.8M0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Phase structure and electrochemical characteristics of CaNi4.7Mn0.3 hydrogen storage alloy by mechanical alloying

Electrochemical properties of the CaNi 5− x Mn x electrodes synthesized by mechanical alloying

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Electrochemical properties of theCaNi₄_.₈M_0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Electrochemical properties of theCaNi₄_.₈M_0.2(MMg, Zn, and Mn) mechanical milling alloys used as anode materials in nickel‐metal hydride batteries

Electrochemical properties of the CaNi _{5−
x} Mn _x electrodes synthesized by mechanical alloying