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Nickel-cobalt compound hydroxide and method and device for producing same, positive electrode active substance for nonaqueous electrolyte secondary cell and method for producing same, and nonaqueous electrolyte secondary cell

A composite hydroxide and cathode active material technology, applied in the direction of active material electrodes, secondary batteries, nickel compounds, etc., can solve the problems of reduced charge and discharge life, difficult industrial scale production, strong self-discharge, etc., to improve the cycle characteristics, cost reduction, and productivity improvement effects

Active Publication Date: 2015-05-27
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical capacity is only about half of that of lithium-cobalt composite oxides, so there is a disadvantage that it is difficult to meet the demand for higher capacity of lithium-ion secondary batteries, which is increasing year by year.
In addition, there are also the following disadvantages: at a temperature above 45°C, self-discharge is strong, and the charge-discharge life is also reduced
However, this technology requires strict control of crystallization conditions, which makes it difficult to apply to industrial-scale production. In addition, the reaction process and the separation process are carried out in a single reaction tank, which may cause ungrown particles to be mixed in. Limitations in the homogenization of recovered particles

Method used

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  • Nickel-cobalt compound hydroxide and method and device for producing same, positive electrode active substance for nonaqueous electrolyte secondary cell and method for producing same, and nonaqueous electrolyte secondary cell
  • Nickel-cobalt compound hydroxide and method and device for producing same, positive electrode active substance for nonaqueous electrolyte secondary cell and method for producing same, and nonaqueous electrolyte secondary cell
  • Nickel-cobalt compound hydroxide and method and device for producing same, positive electrode active substance for nonaqueous electrolyte secondary cell and method for producing same, and nonaqueous electrolyte secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] In an overflow crystallization reaction tank with a volume of 34L equipped with four baffles, 32L of industrial water and 1300mL of 25% by mass ammonia water were put in, and heated to 50°C through a constant temperature bath and a heating mantle. Thereafter, a 24% by mass caustic soda aqueous solution was injected, and the pH was controlled to 12.2 based on a liquid temperature of 25°C. Specifically, in order to correctly implement the management of the pH value, the pH value at a temperature of 50° C. is controlled so that the pH value at a temperature of 25° C. is between 12.1 and within the scope of 12.3.

[0172] The crystallization reaction was carried out in the following manner: in a reaction tank maintained at 50°C, while stirring, a constant pump was used to supply 30 mL / minute (min) to adjust the molar concentration of Ni to 1.69 mol / L and the molar concentration of Co to 0.31 mol / L raw material aqueous solution, and while supplying 25 mass % ammonia water a...

Embodiment 2

[0180] The pH of the reaction aqueous solution was maintained at 11.8 based on the liquid temperature of 25° C., and the reaction was carried out at a stirring speed of 800 rpm in the reaction step, and a composite hydroxide was obtained in the same manner as in Example 1. In addition, the management of the pH value is as follows: the reaction aqueous solution in the reaction tank is cooled to 25°C and the pH value is measured, thereby controlling the pH value at a temperature of 50°C so that the pH value at a temperature of 25°C is in the range of 11.7 to 11.9 Inside. The obtained composite hydroxide is subjected to appropriate solid-liquid separation, washed with water and dried to obtain a powdery composite hydroxide. As a result of ICP emission spectroscopic analysis of this composite hydroxide, it was confirmed that it has the general formula: Ni 0.85 co 0.15 (OH) 2 Expressed. In addition, the composite hydroxide was carried out in the same manner as in Example 1 to m...

Embodiment 3

[0185] The composite hydroxide was obtained in the same manner as in Example 1, except that the pH of the reaction aqueous solution was maintained at 12.0 based on the liquid temperature of 25°C. As a result of ICP emission spectroscopic analysis of this composite hydroxide, it was confirmed that it has the general formula: Ni 0.85 co 0.15 (OH) 2 Expressed. In addition, the composite hydroxide was carried out in the same manner as in Example 1 to measure the particle size distribution (D10, D50, and D90) and the tap density. The results are shown in Table 1.

[0186] Thereafter, a composite oxide covered with aluminum was synthesized in the same manner as in Example 1. As a result of ICP emission spectroscopic analysis of this composite oxide, it was confirmed that it has the general formula: Ni 0.83 co 0.13 al 0.04 o 2 Expressed.

[0187] In addition, it carried out similarly to Example 1, and obtained the positive electrode active material. As a result of ICP emiss...

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Abstract

[Problem] By obtaining a compound hydroxide that has a sharp particle diameter distribution, the present invention aims to improve the cycle properties of a nonaqueous electrolyte secondary cell obtained using the nickel-cobalt compound hydroxide as the precursor. [Solution] In the present invention, a slurry contains a nickel-cobalt compound hydroxide that is obtained by reacting and continuously feeding to a reactor an aqueous solution containing at least nickel and cobalt, an aqueous solution that serves as an ammonium ion donor, and an aqueous caustic alkali solution. The slurry is continuously extracted and the slurry is separated by grading into large particle diameter portions and small particle diameter portions. The small particle diameter portion is continuously circulated back to the reactor. The resulting nickel-cobalt compound hydroxide is represented by the general formula Ni1-x-yCoxMy (OH)2 (where 0.05 ≤ x ≤ 0.50, 0 ≤ y ≤ 0.10, 0.05 ≤ x + y ≤ 0.50, M is at least one metal element selected from Al, Mg, Mn, Ti, Fe, Cu, Zn, and Ga), wherein the correlations of (D50-D10) / D50 ≤ 0.30 and (D90-D50) / D50 ≤ 0.30 are established between D10, D50, and D90.

Description

technical field [0001] The invention relates to a nickel-cobalt composite hydroxide, a manufacturing method and a manufacturing device thereof. In addition, the present invention also relates to a positive electrode active material for a non-aqueous electrolyte secondary battery using the nickel-cobalt composite hydroxide as a raw material and a manufacturing method thereof, and the positive electrode active material for a non-aqueous electrolyte secondary battery as a positive electrode material The non-aqueous electrolyte secondary battery used. Background technique [0002] In recent years, with the advancement of electronic technology, the miniaturization and weight reduction of electronic equipment has been rapidly promoted. In particular, with the popularization and high functionality of portable electronic devices such as mobile phones and notebook computers, the development of small and lightweight secondary batteries having high energy density is strongly desired a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/525
CPCC01G53/006C01P2004/61C01P2006/11C01P2006/40H01M4/525C01G53/00C01G53/42C01G53/66C01P2004/51Y02E60/10B01J19/24B01J2219/00033B01J2219/24H01M4/049H01M10/0525H01M2004/028
Inventor 加濑克也镰田康孝渔师一臣
Owner SUMITOMO METAL MINING CO LTD
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