Optimisation of active material for positive electrodes of NiCd accumulators

Micka, K.; Zábranský, Z.; Svatá, M.

doi:10.1016/0378-7753(82)80003-7

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…The above-mentioned principles of NHE activation by means of nickel hydroxide structure modification also prove to be fruitful in the case of "anionic" activation, i.e., substitution of some insignificant portion of hydroxide layers of three-layer stacks for stable anions. To these principles we can attribute some known methods (28,29), according to which the effect of NHE activation is compa- (30). In the IR spectra some insignificant differences can be seen only in the region of broad absorption bands at 3400-3200 cm -~, corresponding to the stretching modes of H-bonded water molecules and OH groups, and also for a weak band at 3590 cm ~.…”

Section: Resultsmentioning

confidence: 99%

Structure Modification and Change of Electrochemical Activity of Nickel Hydroxides

Ezhov

Malandin

1991

J. Electrochem. Soc.

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Questions concerning the interrelationship between the structure of nickel hydroxides used in alkaline batteries and their electrochemical activity are discussed. A great role in the nickel hydroxide electrode (NHE) activation played by the increase of the depth of the transition higher nickel hydroxides ---, ~-Ni(OH)2 during NHE discharging is shown. The latter can be achieved by modifying the higher nickel hydroxide structure. In particular, the cobalt(II) hydroxide additive enables this modification during NHE charging forming the fragments of the CoHQ structure embedded into the crystalline lattice, which leads to the inhibition effects during the transition phase ~-Ni(OH)2--~ ~-NiOOH and to some certain types of the crystalline lattice disorder facilitating the reverse transition to the ~-Ni(OH)2 structure during NHE discharging. It has been shown that the ~-NiOOH structure modification can be achieved by various means. In particular, some positive effects increasing the NHE reversibility are observed in the presence of the inert zinc hydroxide additive, as well as some portion of stable anions incorporated into the ~-Ni(OH)~ structure forming H-bonds with the layers of the nickel hydroxide crystalline lattice.

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Section: Resultsmentioning

confidence: 99%

Structure Modification and Change of Electrochemical Activity of Nickel Hydroxides

Ezhov

Malandin

1991

J. Electrochem. Soc.

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“…Activation of nickel oxide electrode with cobalt additive improves the utilization coefficient of active material in alkaline accumulators by 10-15 %. Cobalt is added to the positive electrode in the form of hydroxide [26]. It is stated in the literature that hydroxide is a surface activator, i. e., a significant increase of capacity occurs if cobalt compounds are on the surface of nickel hydroxide [27].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

A study of multilayered electrochromic platings based on nickel and cobalt hydroxides

Kotok

Кovalenko

2018

EEJET

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Запропоновано отримання багатошарових електрохромних плівок на основі Ni(OH) 2 і Co(OH) 2 катодним темплатним методом. Отримані плівки показали електрохімічну активність і електрохромні властивості. Найкращі електрохромні характеристики показала плівка, яку отримували послідовно в розчинах із додаванням полівінілового спирту, що містять нітрат кобальту і нікелю 2 і 78 хвилин відповідно Ключові слова: Ni(OH) 2 , Co(OH) 2 , електрохромізм, електрохромні матеріали, CoOOH, полівіниловый спирт, багатошарові покриття Предложено получение многослойных электрохромных пленок на основе Ni(OH) 2 и Co(OH) 2 катодным темплатным методом. Полученные пленки показали электрохимическую активность и электрохромные свойства. Наилучшие электрохромные характеристики показала пленка, которую получали последовательно в растворах сдобавлением поливинилового спирта, содержащих нитрат кобальта и никеля 2 и 78 минут соответственно Ключевые слова: Ni(OH) 2 , Co(OH) 2 , электрохромизм, электрохромные материалы, CoOOH, поливиниловый спирт, многослойные покрытия

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“…[6][7][8][9] Many methods for the synthesis of nickel hydroxide have been reported, such as solid-state reaction, 10 homogeneous precipitation, 11,12 electrochemical method, 13 ion-exchange resin method, 14 and chemical precipitation method, [15][16][17][18] etc. Recently, Subbaiah et al 19 and Konishi et al 20 prepared nickel hydroxide via a complexation-precipitation route and hydrolytic stripping in organic solvent, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Nickel hydroxide is not only widely used for the cathode material of rechargeable alkaline batteries (Ni/Cd, Ni/MH, Ni/H 2 , and Ni/Zn batteries), − but also is applied in the manufacture of lithium−nickel composite oxide cathode material for lithium ion batteries. − Many methods for the synthesis of nickel hydroxide have been reported, such as solid-state reaction, homogeneous precipitation, , electrochemical method, ion-exchange resin method, and chemical precipitation method, − etc. Recently, Subbaiah et al and Konishi et al prepared nickel hydroxide via a complexation−precipitation route and hydrolytic stripping in organic solvent, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Subbaiah et al and Konishi et al prepared nickel hydroxide via a complexation−precipitation route and hydrolytic stripping in organic solvent, respectively. The chemical precipitation method is extensively used in the industry, in which nickel hydroxide is generally prepared from NiSO 4 solution, because the SO 4 2- ions obviously facilitate precipitation and decrease the absorbed impurities on the surface of nickel hydroxide particles. , Mrha and co-workers determined that the presence of some SO 4 2- anions in nickel hydroxide benefits the electrochemical performance of alkaline Ni/Cd batteries; however, the nickel hydroxide prepared from Ni(NO 3 ) 2 shows lower activity.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Morphological Control of Nickel Hydroxide for Lithium−Nickel Composite Oxide Cathode Materials by an Eddy Circulating Precipitation Method

Sun

Cheng

Wang

et al. 2006

Ind. Eng. Chem. Res.

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Spherical nickel hydroxide with high density was synthesized via an eddy-circulating precipitation method, in which a Ni(NO 3 ) 2 solution was reacted with a NaOH solution at 65-70°C, and NH 4 NO 3 -NH 3 ‚H 2 O was used as a buffer reagent. The resulting nickel hydroxide particles, with a tap density of 2.20 g/cm 3 and the average particle size of 30.6 µm, are aggregated by the granular crystallites. The morphology of the crystallite can be controlled by changing the anions. The LiNi 0.8 Co 0.2 O 2 that has been prepared using this nickel hydroxide shows excellent electrochemical performance, which delivers an initial discharge capacity of 190.90 mAh/g at a current rate of 25 mA/g between 3.0 V and 4.35 V and exhibits good cycle stability.

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Optimisation of active material for positive electrodes of NiCd accumulators

Cited by 10 publications

References 8 publications

Structure Modification and Change of Electrochemical Activity of Nickel Hydroxides

Structure Modification and Change of Electrochemical Activity of Nickel Hydroxides

A study of multilayered electrochromic platings based on nickel and cobalt hydroxides

Synthesis and Morphological Control of Nickel Hydroxide for Lithium−Nickel Composite Oxide Cathode Materials by an Eddy Circulating Precipitation Method

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