The influence of some additives on the electrochemical behaviour of sintered nickel electrodes in alkaline electrolyte

Constantin, D. M.; Rus, E. M.; Oniciu, L.; Ghergari, Lucreţia

doi:10.1016/s0378-7753(98)00053-6

Cited by 28 publications

(16 citation statements)

References 15 publications

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“…Also, the addition of cobalt in Ni(OH) 2 lattice has been shown to increase the oxygen evolution potential, thereby improving the Ni(OH) 2 active material utilization and cycle life [9][10][11][12][13][14][15]. Other additions, * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature characteristics of advanced Ni-MH batteries using nickel electrodes containing CaF2

Zhang¹,

Gong²,

Song³

et al. 2008

Journal of Power Sources

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Section: Introductionmentioning

confidence: 99%

“…Tel. : +1 519 253 3000x4785; fax: +1 519 973 7007. including Ba, Mn, Cu, Zn and Cd, have also been studied in order to increase the performance of Ni-MH batteries [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

High-temperature characteristics of advanced Ni-MH batteries using nickel electrodes containing CaF2

Zhang¹,

Gong²,

Song³

et al. 2008

Journal of Power Sources

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“…* Ni-MH batteries thus need to match with a variety of applications, and in particular, they are required to work in a wide temperature range by improving both high-and low-temperature characteristics. The discharge capacity of a Ni-MH battery charged at high temperature is usually lower than that charged at room temperature [9][10][11][12][13]. This is considered to be due to the oxygen evolution reaction or a side reaction (Eq.…”

Section: Introductionmentioning

confidence: 99%

“…In the past, the electrolyte composition [10] and coprecipitating elements into nickel hydroxide such as cobalt and calcium [11][12][13][14][15] were investigated in order to improve the high-temperature charge efficiency. Powder additives such as calcium compounds, barium compounds and rare-earth compounds are used for this purpose for a non-sintered nickel electrode [16][17][18][19][20] manufacturing point of view to apply such powder additives to a sintered nickel electrode, which possesses better power characteristics than a non-sintered nickel electrode and is suitable for use in HEVs.…”

Section: Introductionmentioning

confidence: 99%

Improvement of high- and low-temperature characteristics of nickel-metal hydride secondary batteries using rare-earth compounds

Shinyama

Nakamura

Nohma

et al. 2006

Journal of Alloys and Compounds

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“…Common additives include nickel, 6 cobalt, 5,7 cobalt oxide, 8 and cobalt hydroxide. 9,10 Interestingly, these additives are either ferromagnetic 11 ͑Ni and Co͒ or antiferromagnetic ͓CoO 11 and Co͑OH͒ 2 12 ͔. Ferromagnets have a spontaneous magnetic moment, such that they have a magnetic moment even in the absence of an applied field.…”

mentioning

confidence: 99%

Magnetized Nickel Electrodes for Improved Charge and Discharge Rates in Nickel Metal Hydride and Nickel Cadmium Batteries

Ping-hua¹,

Leddy²

2006

Electrochemical and Solid-State Letters

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Nickel hydroxide electrodes serve as positive electrodes in several batteries including nickel metal hydride and nickel cadmium batteries. Nickel hydroxide slurries are coated onto platinum electrodes and allowed to dry either with or without an external magnetic field. Once dried, the external magnet is removed. Films are also formed that incorporate chemically inert, silaneshrouded magnetite microparticles. Magnetized films exhibit larger cyclic voltammetric currents than corresponding nonmagnetized films. Magnetized films generate currents that are 1.2 5 to 1.7 9 times that of nonmagnetized films containing no microparticles. Results are consistent with a magnetically facilitated increase in charge and discharge rates. The nickel oxyhydroxide/hydroxide electrode is common to several technologically important batteries including nickel metal hydride ͑Ni-MH͒, nickel cadmium ͑NiCd͒, nickel zinc, and nickel iron batteries.1-4 The capacity of nickel metal hydride batteries is controlled by the positive ͓NiOOH/Ni͑OH͒ 2 ͔ electrode. 5 The performance of the NiOOH/Ni͑OH͒ 2 electrode is improved by the use of various additives. ͔. Ferromagnets have a spontaneous magnetic moment, such that they have a magnetic moment even in the absence of an applied field. Antiferromagnetic materials have a net magnetic moment above the Néel temperature. Magnetization of the AB 5 alloy used in the negative electrode of nickel metal hydride batteries has increased discharge rate and maximum discharge capacity. 13Above cryogenic temperatures, magnetic effects on chemical systems do not arise through thermodynamic processes but through the dynamics of mass transport and kinetics. Mass-transport effects include the magnetohydrodynamics of charged particles moving in a magnetic field 14,15 and the motion of paramagnetic species in field gradients. 16 Kinetic effects arise through spin polarization where the magnetic field couples the electron and nuclear spins to facilitate reaction rates. [17][18][19] Incorporation of magnetic microparticles onto and into electrodes in various electrochemical systems has enhanced currents. [20][21][22][23][24][25] Here, cyclic voltammetric data are presented that are consistent with magnetization enhancing the rate of charge and discharge for nickel oxyhydroxide/hydroxide electrodes as compared to nonmagnetized electrodes. Platinum electrodes were coated by either a simple Ni͑OH͒ 2 slurry or by a Ni͑OH͒ 2 slurry containing magnetic microparticles. The magnetic microparticles had a core of magnetite ͑Fe 3 O 4 ͒ rendered chemically inert by a silane coating. The films were cast either in the presence or absence of an external magnetic field. Once magnetized films were dried, the external magnet was removed. After preconditioning the electrode, electrodes were examined using cyclic voltammetry. Magnetization enhanced the observed current. For magnetized films containing magnetic microparticles, the current approaches twice that observed for the nonmagnetized films containing no magnetic microparticles. Exper...

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The influence of some additives on the electrochemical behaviour of sintered nickel electrodes in alkaline electrolyte

Cited by 28 publications

References 15 publications

High-temperature characteristics of advanced Ni-MH batteries using nickel electrodes containing CaF2

High-temperature characteristics of advanced Ni-MH batteries using nickel electrodes containing CaF2

Improvement of high- and low-temperature characteristics of nickel-metal hydride secondary batteries using rare-earth compounds

Magnetized Nickel Electrodes for Improved Charge and Discharge Rates in Nickel Metal Hydride and Nickel Cadmium Batteries

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