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Coated nickel hydroxide powder for alkali secondary battery positive electrode active material and method of producing same

A positive electrode active material, nickel hydroxide technology, applied in the field of nickel hydroxide powder and its manufacturing, can solve the problems of no effective solution for paste dispersibility, unsatisfactory foamed nickel filling density, etc., to achieve high The effect of densification

Active Publication Date: 2015-07-29
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] As mentioned above, although the high-density filling scheme brought about by the high tap density of the coated nickel hydroxide powder coated with the cobalt compound has been proposed, no effective solution has been proposed to improve the dispersibility in the paste, and there is a production The problem that the filling density of foamed nickel, etc. in the positive electrode has not yet reached a satisfactory level

Method used

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  • Coated nickel hydroxide powder for alkali secondary battery positive electrode active material and method of producing same

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Experimental program
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Effect test

Embodiment 1

[0084] (Crystalization process)

[0085] After dissolving 134.3 kg of industrial-use nickel sulfate hexahydrate, 4.6 kg of industrial-use cobalt sulfate heptahydrate, and 4.0 kg of magnesium sulfate in water, the total amount was adjusted to 300 L to prepare a nickel-containing aqueous solution. Separately, 100 L of a 48% by mass industrial sodium hydroxide solution was diluted with water to prepare a total of 200 L of an aqueous sodium hydroxide solution.

[0086] Next, after filling the reaction tank with a capacity of 9 L up to the overflow port with water, the reaction tank was placed in a constant temperature water tank, and the temperature was adjusted to 50° C. and kept warm. And, while stirring in the reaction tank, continuously supply the above-mentioned nickel-containing aqueous solution and industrial 25% by mass ammoniacal liquor in the reaction tank, at the same time, adopt a pH controller, and utilize the above-mentioned sodium hydroxide solution to adjust the pH...

Embodiment 2

[0097] Cobalt oxyhydroxide-coated Nickel hydroxide powder.

[0098] In the obtained cobalt oxyhydroxide-coated nickel hydroxide powder, the total amount of ions eluted in the suspension was 2.2 mmol / L. In addition, the eluted amounts of sodium ions and sulfate ions were 1.9 mmol / L and 0.08 mmol / L, respectively. The turbidity of the suspension was 499 degrees (kaolin).

[0099] In addition, the total carbon content of the obtained cobalt oxyhydroxide-coated nickel hydroxide powder was 200 ppm. The above measurement results are shown in Table 1 below.

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Abstract

Provided is a coated nickel hydroxide powder in which dispersibility when converted into a paste is improved and agglomeration suppressed, and which can be filled at a high density into a three-dimensional porous metal body during production of positive electrodes for use in alkali secondary batteries. This coated nickel hydroxide powder comprises nickel hydroxide particles coated on the surface with a coating layer of a cobalt compound, and the total elution of ions excluding oxonium ions, hydroxide ions and carbonate ions of a suspension comprising 10ml of water added to 10g of the coated nickel hydroxide powder is 6.5mmol / l or less. To this end, the coated nickel hydroxide powder obtained through a crystallization step, a coating step and a washing step is dried in a drying step in a decarboxylated atmosphere with a carbon-containing gas partial pressure of 15Pa or less.

Description

technical field [0001] The present invention relates to a nickel hydroxide powder as a positive electrode active material for an alkaline secondary battery and a method for producing the same, in particular to a nickel hydroxide powder made of nickel hydroxide powder in order to ensure the conductivity between particles and improve the utilization rate, life characteristics and output characteristics of the battery. Nickel hydroxide powder coated with cobalt compound and its production method. Background technique [0002] In recent years, while the demand for secondary batteries for portable devices and hybrid vehicles has been increasing, there is a strong demand for higher capacity. For this reason, the nickel hydroxide powder used for the positive electrode material of the alkaline secondary battery has also been improved as follows: in order to improve the utilization rate at high temperature, cobalt is solid-dissolved in the nickel hydroxide powder, or, in order to imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/36
CPCH01M4/366C01P2002/50H01M4/32C01P2004/80H01M4/52C01G53/04Y02E60/10
Inventor 冈东寿明二瓶知伦笹冈英雄
Owner SUMITOMO METAL MINING CO LTD
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