Some factors affecting the cycle lives of LaNi5-based alloy electrodes of hydrogen batteries

Sakai, Tetsuo; Oguro, Keisuke; Miyamura, Hiroshi; Kuriyama, Nobuhiro; Kato, Akihiko; Ishikawa, Hiroshi; Iwakura, Chiaki

doi:10.1016/0022-5088(90)90027-h

Cited by 306 publications

(115 citation statements)

References 11 publications

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“…With a view to application as electrodes in Ni-MH batteries, addition of Co is well known to improve the cycling life of the electrode [10]. The aim of this study was to get a better understanding of the influence of reactive mechanical grinding (RMG) and Co addition on both the crystallographic and the hydrogen sorption behavior of the Mg+10 wt.% Co mixture.…”

Section: Introductionmentioning

confidence: 99%

Effect of reactive mechanical grinding on chemical and hydrogen sorption properties of the Mg+10 wt.% Co mixture

Bobet

Chevalier

Darriet

2002

Journal of Alloys and Compounds

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:Reactive mechanical grinding (MG under H 2 ) of magnesium powder improves the hydrogen sorption properties. The hydrogenation of Mg starts in situ during the milling process that allows suppressing the activation procedure generally requested for Mg. The addition of Co, which acts as a catalyst for the dissociation of H 2 , also leads to an improvement of the hydrogen sorption properties (but a strong dependence upon the milling time is reported). The hydriding is determined to be a two-step process: nucleation and diffusion. A direct relationship exists between the nucleation duration and the specific surface. A critical milling time exists below which the diffusion process is improved and above which no more improvement is observed (the maximum internal stress in the powder is also reached at this critical time). The diffusion is controlled by the number of crystallites per particle which can be decreased by increasing the milling time up to 10 h. However, the sorption properties of Mg-Co mixtures are a little under those reported for MgH 2 -metal mixtures.

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Section: Introductionmentioning

confidence: 99%

Effect of reactive mechanical grinding on chemical and hydrogen sorption properties of the Mg+10 wt.% Co mixture

Bobet

Chevalier

Darriet

2002

Journal of Alloys and Compounds

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“…For example, the LaCrO 3 composition has a volume change about 0.4% [67]. In contrast, the intermetallic alloy-LaNi 5 presents a volume change about 25% in each hydrogenation because of the introduction of H atoms in the interstices of the CaCu 5 structure [87]. Up to date, reported values of volume change for different perovskitetype oxides remains below 1% after hydrogenation [67,77], which is significantly lower than values reported for traditional intermetallic alloys.…”

Section: Synthesis Of Rare-earth Perovskite-type Oxides For Applicatimentioning

confidence: 83%

Review: on rare-earth perovskite-type negative electrodes in nickel–hydride (Ni/H) secondary batteries

Henao

Martínez-Gómez

2017

Mater Renew Sustain Energy

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Rare-earth perovskites-type oxides are compounds with the general formula ABO 3 . There are many industrial and research applications related to their properties such as photocatalytic activity, magnetism, or pyroferro and piezo-electricity, and interest in these compounds in the field of energy storage and conversion is growing. Rare-earth perovskite-type oxides may be used in nickelmetal hydride (Ni/MH) battery technology because these materials may store hydrogen in strong alkaline environments, and also because of their abundance and low cost. In this review, the use of rare-earth perovskite-type oxides in Ni/MH batteries is described, starting from their crystalline structure and production methods. In each category, a description concerning the latest advances and future research direction is presented. Electrochemical performance of the perovskite-type electrodes is reviewed extensively. In addition, various strategies for enhancing their hydrogen storage capacity as a negative electrode in hydrogen batteries are discussed. Drawbacks and challenges of this technology are also presented.

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“…The properties of the metal hydrides are traditionally controlled by the nature and relative amount of the constituent elements. 10) However, this straight forward way does not affect the thermodynamic properties of Mg-based hydrides in most cases, because the thermodynamic stability of Mg-based alloy is dominated by the strong Mg-H bonding. 11,12) From the thermodynamic point of view, stability of Mgbased alloys gives spontaneously the results that hydrogen absorption-desorption pressures becomes lower.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Consideration on Multi-Step Hydrogenation of Mg<SUB>17</SUB>Al<SUB>12</SUB> Assisted by Phase Separation

Sato

Kuji

2011

Mater. Trans.

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The multi-step hydrogenation and dehydrogenation on the pressure-composition-temperature relations for the Mg 17 Al 12 -H system was thermodynamically discussed on the based upon the enthalpy for Mg-Al alloy recombination during corresponding reaction with hydrogen. Pressure-composition-temperature diagrams were measured Mg 17 Al 12 -H system by means of the volumetric technique in the temperature range of 598-648 K. The isotherms show two step hydrogenation and dehydrogenation indicating a disproportionate formation of MgH 2 via Mg 2 Al 3 intermetallic phase. The decomposition of Mg from the intermetallic phase causes thermodynamic destabilisation for the formation of Mg hydrides. The molar enthalpies of hydride formation for the investigated systems are: ÁH f ¼ À38:5 AE 0:9 kJ (mol H ) À1 for the Mg-H system;À1 for the first-step hydrogenation in Mg 17 Al 12 ; ÁH f ¼ À31 AE 1 kJ (mol H ) À1 for the second-step hydrogenation in

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Some factors affecting the cycle lives of LaNi5-based alloy electrodes of hydrogen batteries

Cited by 306 publications

References 11 publications

Effect of reactive mechanical grinding on chemical and hydrogen sorption properties of the Mg+10 wt.% Co mixture

Effect of reactive mechanical grinding on chemical and hydrogen sorption properties of the Mg+10 wt.% Co mixture

Review: on rare-earth perovskite-type negative electrodes in nickel–hydride (Ni/H) secondary batteries

Thermodynamic Consideration on Multi-Step Hydrogenation of Mg<SUB>17</SUB>Al<SUB>12</SUB> Assisted by Phase Separation

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