Stacking structures and electrode performances of rare earth–Mg–Ni-based alloys for advanced nickel–metal hydride battery

Ozaki, Tomonobu; Kanemoto, Manabu; Kakeya, Tadashi; Kitano, Yasuyuki; Kuzuhara, Minoru; Watada, Masaharu; Tanase, Shigeo; Sakai, Tetsuo

doi:10.1016/j.jallcom.2007.03.059

Cited by 114 publications

(68 citation statements)

References 12 publications

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“…X-ray crystallographic analysis as well as electron microscopic analysis were carried out and reported partially in the previous papers. 18,19) In this paper, we present electron micrographs for the Pr 5 Co 19 -type structure (5:19H-structure) and the Ce 5 Co 19 -type structure (5:19R-structure) which were found in the alloy system, and also demonstrate that a complex layer structure can be analyzed by careful observation of the electron diffraction pattern.…”

Section: Introductionmentioning

confidence: 86%

“…18,19) Specimens suitable for electron microscopy were prepared using a mechanical polishing machine and an ion thinning instrument. Two electron microscopes were employed, JEM2010 in Hiroshima Institute of Technology, and H9000 at the Research Center for Ultrahigh Voltage Electron Microscopy, Osaka University.…”

Section: Methodsmentioning

confidence: 99%

“…In the La-Mg-Ni alloy system studied here, the existence of 1:3R-, 2:7H-, 5:19R-, 5:19H-and 1:4R-structures has been confirmed by X-ray diffraction analysis, and it has also been confirmed that La or Mg atoms occupy the site for large atoms and the Ni atoms occupy the site for small atoms. 18,19) The crystal structure of the Laves phase or the CaCu 5 (LaNi 5 ) structure are known as closed pack structures of spheres with different radii. Atomic layers forming these structures are illustrated in Fig.…”

Section: )mentioning

confidence: 99%

“…In this paper we will use the value 0.404 nm for the thickness, which was obtained by X-ray analysis. 18,19) In Fig. 2, an example of the TEM image is presented for the 5:19H structure together with a projection of the crystal structure.…”

Section: )mentioning

confidence: 99%

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Electron Diffraction study of Layer Structures in La-Mg-Ni Hydrogen Absorption Alloys

et al. 2007

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In order to improve the hydrogen absorption properties of the layer structure appearing at the nickel rich side of La-Mg-Ni alloy, appropriate amounts of Ni were replaced by some elemental atoms, Mn, Co and Al. The La 0:8 Mg 0:2 Ni 3:4Àx Co 0:3 (MnAl) x (0 < x < 0:4) alloy system was synthesized and crystal structures were investigated by electron microscopy. The atomic concentration ratio of (LaMg) to the other atoms was 3.7 in this system. The Pr 5 Co 19 -type structure (5:19H-structure) and the Ce 5 Co 19 -type structure (5:19R-structure) were found in this alloy system. Electron micrographs of these structures are presented in this paper. Structure analysis of the complex layer structure is demonstrated by careful observation of the electron diffraction pattern.

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Section: Introductionmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Electron Diffraction study of Layer Structures in La-Mg-Ni Hydrogen Absorption Alloys

et al. 2007

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“…19 The RE portion consists of La, Pr, and Nd. An oxidation-resistant carbon (CB) and ethylene-vinyl-acetate (EVA) were dispersed in a xylene solvent at the molar ratio of 1:1.…”

Section: Electrode and Battery Preparationmentioning

confidence: 99%

Cobalt-free Materials for Nickel-metal Hydride Battery: Self-discharge Suppression and Overdischarge-resistance Improvement

et al. 2013

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For use of the large-sized Ni-MH battery in the social-infrastructure, it is important to improve its self-discharge suppression and overdischarge resistance as well as its high-power and long cycle-life performances. The use of the RE 0.9 Mg 0.1 Ni 3.9 Al 0.2 alloy as the negative electrode of a Ni-MH battery effectively suppressed the self-discharge compared to the use of the conventional AB 5 -type alloy. Meanwhile, a carbon-coated Ni(OH) 2 prepared using a fluid-bed coating method exhibited a better overdischarge resistance than that using the conventional CoOOHcoated one. The Co, which is an expensive rare metal, is completely removed from the Ni-MH battery using these Co-free electrodes. The Co-free Ni-MH battery combines several good battery characteristics, such as a low selfdischarge and overdischarge resistance.

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Nickel‐Metal Hydride (Ni‐MH) Batteries

Arya

Verma

2020

Rechargeable Batteries

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Stacking structures and electrode performances of rare earth–Mg–Ni-based alloys for advanced nickel–metal hydride battery

Cited by 114 publications

References 12 publications

Electron Diffraction study of Layer Structures in La-Mg-Ni Hydrogen Absorption Alloys

Electron Diffraction study of Layer Structures in La-Mg-Ni Hydrogen Absorption Alloys

Cobalt-free Materials for Nickel-metal Hydride Battery: Self-discharge Suppression and Overdischarge-resistance Improvement

Nickel‐Metal Hydride (Ni‐MH) Batteries

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