The Outcome of Cobalt in the Nickel–Cobalt Oxyhydroxide Electrodes of Alkaline Batteries

Pralong, V.; Delahaye‐Vidal, A.; Chabre, Y.; Beaudoin, B.; Tarascon, Jean‐Marie

doi:10.1006/jssc.2001.9293

Cited by 27 publications

(11 citation statements)

References 12 publications

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“…Earlier work on sintered nickel electrodes, where the nickel-hydroxide material is chemically precipitated onto a sintered nickel substrate ͑by repeated and sequential impregnation of nickel or nickel/cobalt solution and alkaline solution͒, found that the incorporation of cobalt hydroxide lowered the oxidation potential of the nickel-hydroxide electrode. 14,15 The incorporation of cadmium hydroxide, however, was found to increase the oxygen evolution potential ͑OEP͒. 14 A similar OEP increase was observed when using calcium hydroxide, 14 and to a lesser extent when using zinc hydroxide.…”

supporting

confidence: 71%

The Influence of Nickel-Hydroxide Composition and Microstructure on the High-Temperature Performance of Nickel Metal Hydride Batteries

Fierro

Zallen

Koch

et al. 2006

J. Electrochem. Soc.

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A special precipitation process developed at Ovonic Battery Company has been utilized to produce spherical, high-density nickel-hydroxide powders with different chemical compositions. These powders were tested in sealed, cylindrical C-cell size nickel metal hydride batteries to study the effect of chemical composition on high-temperature performance. Charging measurements were made at 25, 45, and 65°C. It was found that coprecipitated cobalt in the presence of magnesium, zinc, and calcium increases the voltage gap between the oxygen-evolution potential and the midpoint voltage of the battery. The larger voltage gap dramatically increases the charge acceptance of the battery, improving its charging efficiency ͑normalized to the room-temperature value͒ from around 50% for conventional nickel hydroxide to 85% for the improved materials when measured at 65°C.Nickel metal hydride batteries ͑NiMH͒ are the batteries of choice for a variety of applications including small devices such as portable electronics and consumer batteries as well as larger systems such as stationary power or electric and hybrid vehicles. 1 Extensive work has been done on the positive ͑nickel-hydroxide͒ electrode to improve the charge efficiency of the battery over a wide temperature range. Because NiMH batteries are frequently being utilized at temperatures that rise well above room temperature, especially in fast charge applications, high-temperature performance is an active area of research and development.It is well known that as the temperature of the battery increases, the charge acceptance of the positive electrode decreases, and the battery cannot be fully charged. 2 One important approach for improving the performance of the nickel hydroxide is to replace a small fraction of the nickel atoms in the crystal lattice by other atoms. This changes the electrochemical properties of the material and can affect the performance of the battery at higher temperatures. Compositional modification is accomplished by coprecipitating metal cations with nickel cations to form the metal hydroxide composed primarily of nickel ͑usually Ͼ85% by weight͒ and now alloyed with the modifier elements.Many papers have been published on nickel-hydroxide and nickel-hydroxide electrodes. Most of the work, however, has been done either on ͑i͒ thin-film electrodes, 3-7 ͑ii͒ electrochemically impregnated electrodes, 8 or ͑iii͒ irregularly shaped nickel-hydroxide particles that are pasted onto nickel foam. 9,10 Only a modest amount of work has been reported for spherical-particle, high-density powders. 11-13 Battery-grade material is produced by only a small number of companies, and only a few standard chemical compositions are offered commercially. Spherical high-density powder is widely used in the battery industry and is of major technological importance.The type and quantity of modifiers that can be utilized during the process of precipitation can modify, or "tune" the nickel hydroxide to achieve battery performance improvements that are attributable to the nickel ele...

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supporting

confidence: 71%

The Influence of Nickel-Hydroxide Composition and Microstructure on the High-Temperature Performance of Nickel Metal Hydride Batteries

Fierro

Zallen

Koch

et al. 2006

J. Electrochem. Soc.

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“…In particular, many investigations have recently focused on nanostructure Co 3 O 4 as a promising anode alternative due to its higher theoretical capacity (890 mAh/g) compared to that of commercialized carbonaceous material (theoretical capacity: 392 mAh/g) which is now becoming limited owing to its low capacity. Extensive efforts have been made with the aim of achieving high electrochemical performances for lithium-ion batteries through the application of one-dimensional (1D) Co 3 O 4 nanowires [ 11 , 12 ], nanostructured Co 3 O 4 thin films fabricated by electrochemical deposition method [ 13 ] or pulsed laser deposition [ 14 ], nanoparticulate Co 3 O 4 powders [ 15 - 17 ], and nanoparticle Co 3 O 4 /carbon composites [ 18 , 19 ]. However, despite such efforts and the high reversible discharge and charge capacities, almost all nano-sized Co 3 O 4 systems exhibit unstable cycle characteristics upon cycling, and in particular suffer drastic capacity fading at a specific cycle number [ 11 - 13 ] 15 [ 17 - 19 ].…”

Section: Introductionmentioning

confidence: 99%

Origin of Capacity Fading in Nano-Sized Co3O4Electrodes: Electrochemical Impedance Spectroscopy Study

Kang

Park

et al. 2008

Nanoscale Res Lett

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Transition metal oxides have been suggested as innovative, high-energy electrode materials for lithium-ion batteries because their electrochemical conversion reactions can transfer two to six electrons. However, nano-sized transition metal oxides, especially Co3O4, exhibit drastic capacity decay during discharge/charge cycling, which hinders their practical use in lithium-ion batteries. Herein, we prepared nano-sized Co3O4with high crystallinity using a simple citrate-gel method and used electrochemical impedance spectroscopy method to examine the origin for the drastic capacity fading observed in the nano-sized Co3O4anode system. During cycling, AC impedance responses were collected at the first discharged state and at every subsequent tenth discharged state until the 100th cycle. By examining the separable relaxation time of each electrochemical reaction and the goodness-of-fit results, a direct relation between the charge transfer process and cycling performance was clearly observed.

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“…This process is reversible, quite stable under cycling and takes place according to a solid solution-like mechanism. Interestingly, reversible transformations from crystallized to amorphous phases through redox reactions have been reported in other systems such as the redox process between nickel and cobalt hydroxide and oxy-hydroxide phases in alkaline batteries [24,25] or with the lithium insertion into manganese phosphide MnP 4 [26]. For these two examples, the electrochemical process is occurring through a biphasic process, suggesting the formation of an amorphous but stable phase from the thermodynamic point of view.…”

Section: Resultsmentioning

confidence: 95%

Reversible transformation from amorphouse Na3Fe3(SO4)2(OH)6 to crystallized NaFe3(SO4)2(OH)6 Jarosite-type hydroxysulfate

et al. 2015

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The Outcome of Cobalt in the Nickel–Cobalt Oxyhydroxide Electrodes of Alkaline Batteries

Cited by 27 publications

References 12 publications

The Influence of Nickel-Hydroxide Composition and Microstructure on the High-Temperature Performance of Nickel Metal Hydride Batteries

The Influence of Nickel-Hydroxide Composition and Microstructure on the High-Temperature Performance of Nickel Metal Hydride Batteries

Origin of Capacity Fading in Nano-Sized Co3O4Electrodes: Electrochemical Impedance Spectroscopy Study

Reversible transformation from amorphouse Na3Fe3(SO4)2(OH)6 to crystallized NaFe3(SO4)2(OH)6 Jarosite-type hydroxysulfate

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