Development of high-capacity nickel-metal hydride batteries using superlattice hydrogen-absorbing alloys

Yasuoka, Shigekazu; Magari, Yoshifumi; Murata, Tetsuyuki; Tanaka, Tadayoshi; Ishida, Jun; Nakamura, Hiroshi; Nohma, Toshiyuki; Kihara, Masaru; Baba, Yoshitaka; Teraoka, Hirohito

doi:10.1016/j.jpowsour.2005.05.054

Cited by 143 publications

(85 citation statements)

References 3 publications

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“…So far, three MH alloys of the A 2 B 7 family have been used as the negative electrode in Ni/MH rechargeable battery. Kohno et al first introduced La 5 Mg 2 Ni 23 with a potential capacity of over 400 mAh g −1 (Kohno, et al, 2000) (Mm, Mg)(Ni, Co, Al) 3.3 alloys were used in high-capacity 2700 mAh AA-size battery by Sanyo (Yasuoka, et al, 2006) where Mm is the misch metal. Finally, (Nd, Mg) 2 (Ni, Al) 7 alloys were used for the low self-discharge AA battery also introduced by Sanyo.…”

Section: Influences On Electrochemical Propertiesmentioning

confidence: 99%

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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Section: Influences On Electrochemical Propertiesmentioning

confidence: 99%

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Young¹

2012

Stoichiometry and Materials Science - When Numbers Matter

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“…Nickel-metal hydride (Ni-MH) batteries have been intensively studied and widely used in today's power tools and portable applications because of their high specific energy power and specific energy density, fast charge and discharge capabilities, environment-friendly characteristics, long cyclic stability and good security [1][2][3]. Although Ni-MH batteries are commercially available, further research is still required to improve their power performance for applications in electric vehicles and hydride vehicles [4].…”

Section: Introductionmentioning

confidence: 99%

Regulation of the discharge reservoir of negative electrodes in Ni–MH batteries by using Ni(OH) (x= 2.10) and γ-CoOOH

Shangguan

Chang

Tang

et al. 2011

Journal of Power Sources

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a b s t r a c tIn this paper, a novel strategy to regulate the discharge reservoir of negative electrodes in Ni-MH batteries is introduced by using Ni(OH) x (x = 2.10) and ␥-CoOOH. The electrochemical measurements of these batteries demonstrate that the use of Ni(OH) x (x = 2.10) and ␥-CoOOH can not only successfully regulate the discharge reservoir of negative electrodes in Ni-MH batteries to an adequate quantity, but also effectively improve the electrochemical performance of the batteries. Compared with normal batteries, the in-house prepared batteries with a lower discharge reservoir exhibit an enhanced discharge capacity, improved high-rate discharge ability, higher discharge potential plateau and superior cycle stability. The effect of Ni(OH) x (x = 2.10) and ␥-CoOOH on the electrochemical performance of nickel electrode is also investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results suggest that the new method is simple and effective for cost reduction of Ni-MH batteries with improved electrochemical performance.

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“…Generally, KOH solutions with concentrations varying from 4.0 M to 8.5 M are used for Ni/MH batteries in the research field and for commercial applications [11,[56][57][58]. In this study, the electrolyte concentration (KOH + Cs 2 CO 3 ) is fixed at 6.77 M. Concentrations of KOH and Cs 2 CO 3 in various electrolytes are shown in Table 2.…”

Section: Electrochemical Performances For Electrolytes With Cs 2 Co 3mentioning

confidence: 99%

Effects of Cs2CO3 Additive in KOH Electrolyte Used in Ni/MH Batteries

Yan

Nei²,

et al. 2017

Batteries

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Abstract:The effects of Cs 2 CO 3 addition in a KOH-based electrolyte were investigated for applications in nickel/metal hydride batteries. Both MgNi-based and Laves phase-related body-centered cubic solid solution metal hydride alloys were tested as the anode active materials, and sintered β-Ni(OH) 2 was used as the cathode active material. Certain amounts of Cs 2 CO 3 additive in the KOH-based electrolyte improved the electrochemical performances compared with a conventional pure KOH electrolyte. For example, with Laves phase-related body-centered cubic alloys, the addition of Cs 2 CO 3 to the electrolyte improved cycle stability (for all three alloys) and discharge capacity (for the Al-containing alloys); moreover, in the 0.33 M Cs 2 CO 3 + 6.44 M KOH electrolyte, the discharge capacity of Mg 52 Ni 39 Co 3 Mn 6 increased to 132%, degradation decreased to 87%, and high-rate dischargeability stayed the same compared with the conventional 6.77 M KOH electrolyte. The effects of Cs 2 CO 3 on the physical and chemical properties of Mg 52 Ni 39 Co 3 Mn 6 were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma, and electrochemical impedance spectroscopy. The results from these analyses concluded that Cs 2 CO 3 addition changed both the alloy surface and bulk composition. A fluffy layer containing carbon was found covering the metal particle surface after cycling in the Cs 2 CO 3 -containing electrolyte, and was considered to be the main cause of the reduction in capacity degradation during cycling. Also, the Cs 2 CO 3 additive promoted the formations of the C-O and C=O bonds on the alloy surface. The C-O and C=O bonds were believed to be active sites for proton transfer during the electrochemical process, with the C-O bond being the more effective of the two. Both bonds contributed to a higher surface catalytic ability. The addition of 0.33 M Cs 2 CO 3 was deemed optimal in this study.

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Development of high-capacity nickel-metal hydride batteries using superlattice hydrogen-absorbing alloys

Cited by 143 publications

References 3 publications

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Stoichiometry in Inter-Metallic Compounds for Hydrogen Storage Applications

Regulation of the discharge reservoir of negative electrodes in Ni–MH batteries by using Ni(OH) (x= 2.10) and γ-CoOOH

Effects of Cs2CO3 Additive in KOH Electrolyte Used in Ni/MH Batteries

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