A study on the swelling of a sintered nickel hydroxide electrode

Oshitani, M.; Takayama, Takashi; Takashima, K.; Tsuji, S.

doi:10.1007/bf01008851

Cited by 117 publications

(40 citation statements)

References 3 publications

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“…NIOH65 nickel hydroxide with low tap density display 0.9 e/Ni. This result is in contrast with the literature reports [11,18,22]. NIOH170 nickel hydroxide sample is highly ordered with a small percentage of stacking faults.…”

Section: Resultscontrasting

confidence: 85%

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The effect of tap density on the reversible charge storage capacity of nickel hydroxide electrodes

Ramesh

2009

Journal of Alloys and Compounds

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Section: Resultscontrasting

confidence: 85%

“…Deabate et al have correlated the electrochemical performance of nickel hydroxide to the structure and conductivity of the samples [21]. The theoretical density of ␣ and ␤ phases of nickel hydroxides are 2.82 g cm −3 and 3.97 g cm −3 respectively [22]. Hui et al…”

Section: Introductionmentioning

confidence: 98%

The effect of tap density on the reversible charge storage capacity of nickel hydroxide electrodes

Ramesh

2009

Journal of Alloys and Compounds

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“…[6][7][8] The powder consists of relatively uniform spherical particles with 14.8 m in average diameter, 0.05 mL/g in pore volume, and 2.4 m 2 /g in specific surface area, each of which is composed of microcrystals as an agglomerate. 9 Into this nickel hydroxide powder we mixed a variety of lanthanide oxides from Pr to Lu (Ln 2 O 3 : 99.9% pure) or mischmetal oxides consisting primarily of Yb 2 O 3 with Lu 2 O 3 in the range 1-10 wt %, then added an aqueous solution of 1 wt % carboxymethylcellulose, and made the mixture into a paste, which was then packed into a foam nickel substrate (1.1 mm thick, 450 g/m 2 ) with 95% porosity.…”

Section: Methodsmentioning

confidence: 99%

Effect of Lanthanide Oxide Additives on the High-Temperature Charge Acceptance Characteristics of Pasted Nickel Electrodes

Oshitani¹,

Watada²,

Shodai³

et al. 2001

J. Electrochem. Soc.

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The development of electric and hybrid vehicles is proceeding against the backdrop of environmental problems, and high-output, high-energy-density nickel-metal hydride cells (NiMH cells) are finding application as the cardinal components for these vehicles. Because such uses require many NiMH cells to be connected in series and installed in small spaces inside vehicles, battery performance and service life are affected by how one controls the heat produced during the charging and discharging processes. This makes the cooling system an essential element, but the impossibility of completely preventing increases of battery temperature and evening out the temperature distribution among batteries has imposed the important technical task of raising the charge acceptance of batteries in the high-temperature range of 35-60ЊC. 1 However, the charge acceptance of NiMH cells declines considerably at high temperatures due to the small oxygen overpotential of the positive nickel electrodes. 2 The charging reaction of nickel electrodesis followed by the evolution reaction of oxygenbut at high temperatures the oxygen overpotential of the nickel electrode drops rapidly, and the charge acceptance decreases owing to conflict between the charging and the oxygen evolution reactions. For that reason one can find reports on various methods employed to increase the oxygen overpotential of nickel electrodes and improve charge acceptance. 2-6 These include the addition of cobalt in solid solution to nickel hydroxide, 3,6 which makes the oxidation potential of nickel electrodes decrease; the addition of compounds with group two elements, such as zinc oxide (ZnO), 4 cadmium oxide (CdO), 2 and calcium oxide (CaO), 4 or of rare earth compounds such as yttrium oxide (Y 2 O 3 ), 4 which act to raise the oxygen evolution potential; or the addition of NaOH or LiOH to the KOH electrolyte. 5 Especially effective is the addition of cobalt in solid solution to nickel hydroxide, but there is a limit to the amount added because it entails a drop in discharge potential. Therefore, actual batteries use these methods in combination, but it is still difficult to maintain a high charge acceptance at high temperatures above 50ЊC.Nevertheless, as noted previously, the oxygen evolution potential of nickel electrodes is suppressed by the addition of, for example, metal oxides whose metal ions have sp closed shells, but not much research has been focused on this mechanism or on the systematic relationship with the electron configurations of the metal ions making up those oxides. We therefore investigated oxides, and their combinations with lanthanide elements (Ln 3ϩ :[Xe] 4f n ), which are characterized by the progressive filling of the 4f orbitals from La 3ϩ to Lu 3ϩ and have sp closed shell-like ion structures,such as Zn 2ϩ , Ca 2ϩ , Cd 2ϩ , and Y 3ϩ , to determine their effects on the high-temperature characteristics of pasted nickel electrodes. ExperimentalNickel electrode preparation.-For the nickel hydroxide active material we used high-density spherical ...

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“…Swelling reduces the integrity of the electrodes and causes a bad electrical contact between the active material and substrate. Consequently, the electrode performances are impaired by the decrease in the charging efficiency and cycle life of the electrodes [26,27]. Swelling, as reflected by an increase in the thickness of the electrodes, is related to the formation of c-NiOOH during cycling.…”

Section: Xrd Patternsmentioning

confidence: 99%

Effects of ball milling on the physical and electrochemical characteristics of nickel hydroxide powder

2005

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Nickel hydroxide powder was modified by the method of ball milling, and the physical properties of both the ball-milled and un-milled nickel hydroxide were characterized by scanning electron microscopy, specific surface area, particle size distribution and X-ray diffraction. It was found that the ball milling processing could obviously increase the surface area, decrease the particle and crystallite size, and reduce the crystallinity of b-Ni(OH) 2 , which was advantageous to the improvement of the electrochemical activity of nickel hydroxide powder. Electrochemical performances of pasted nickel electrodes using the ball-milled nickel hydroxide as an active material were investigated, and were compared with those of the electrodes prepared with the un-milled nickel hydroxide. Charge/ discharge tests showed that the ball-milled nickel hydroxide electrodes exhibited better performances in the charging efficiency, specific discharge capacity, active material utilization and discharge voltage. The improvement of the performances of b-Ni(OH) 2 through ball milling could be attributed to the better reaction reversibility, higher coulombic efficiency, higher oxygen evolution potential and lower electrochemical impedance, as indicated by the cyclic voltammetry and electrochemical impedance spectroscopy studies. Thus, ball milling was an effective method to modify the physical properties and enhance the electrochemical performances of nickel hydroxide powder for the active material of rechargeable alkaline nickel batteries.

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A study on the swelling of a sintered nickel hydroxide electrode

Cited by 117 publications

References 3 publications

The effect of tap density on the reversible charge storage capacity of nickel hydroxide electrodes

The effect of tap density on the reversible charge storage capacity of nickel hydroxide electrodes

Effect of Lanthanide Oxide Additives on the High-Temperature Charge Acceptance Characteristics of Pasted Nickel Electrodes

Effects of ball milling on the physical and electrochemical characteristics of nickel hydroxide powder

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