High-density small-particle-size nickel-cobalt-manganese hydroxide and preparing method thereof

A technology of hydroxide and nickel-cobalt-manganese, which is applied in the field of high-density and small-size nickel-cobalt-manganese hydroxide and its preparation, can solve the problem of low tap density on the particle surface, non-uniform distribution of nickel-cobalt-manganese, and uneven particle size and other problems, to achieve the effect of low production cost, good physical and chemical indicators of the product, and uniform particle size distribution

Active Publication Date: 2014-12-10
宁夏中色金辉新能源有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three elements of nickel, cobalt and manganese obtained by this process cannot be evenly distributed, and the particle size is uneven, the particle shape is poor, and the tap density is low.
Although the gel-sol method can obtain hydroxide precipitation with uniform distribution of nickel, cobalt and manganese, the particle shape is still poor, the tap density is low, and the production cost is high
The co-precipitation method using a complexing agent and surface activity refers to: under the complexation...

Method used

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  • High-density small-particle-size nickel-cobalt-manganese hydroxide and preparing method thereof
  • High-density small-particle-size nickel-cobalt-manganese hydroxide and preparing method thereof
  • High-density small-particle-size nickel-cobalt-manganese hydroxide and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 : d10=3.26um, d50=3.47um, d90=3.62um, tap density=1.42g / cm 3 , specific surface area=12.27m 2 / g, spherical or quasi-spherical.

[0044] (1) According to the molar ratio of Ni:Co:Mn 1:1:1, prepare a nickel-cobalt-manganese sulfate mixed aqueous solution with a concentration of 1.5mol / L, prepare a sodium hydroxide aqueous solution with a concentration of 8mol / L, and prepare a concentration of 10mol / L of ammonia solution;

[0045] (2) Add mother liquor with an ammonia concentration of 0.15mol / L and a pH of 11.6 into a 100L reactor equipped with a temperature-controlled water bath jacket, a stirring paddle, and a precision filter tube as the bottom water, which just submerges the entire reactor mixer;

[0046] (3) Inject nitrogen gas into the sealed reaction kettle all the time, the nitrogen gas flow rate is 1L / min, start stirring at 150 rpm, and adjust the pH of the bottom water to 12.5 with 8mol / L sodium hydroxide solution;

[0047] (...

Embodiment 2

[0056] Ni 0.5 co 0.2 mn 0.3 (OH) 2 : d10=3.18um, d50=3.39um, d90=3.52um, tap density=1.53g / cm 3 , surface area=13.7m 2 / g, spherical or quasi-spherical.

[0057] (1) According to the molar ratio of Ni:Co:Mn 5:2:3, prepare a nickel-cobalt-manganese sulfate mixed aqueous solution with a total concentration of 1mol / L, prepare a sodium hydroxide aqueous solution with a concentration of 8mol / L, and prepare a concentration of 8mol / L L of ammonia solution;

[0058] (2) Add mother liquor with an ammonia concentration of 0.19mol / L and pH=11.78 into a 5000L reactor equipped with a temperature-controlled water bath jacket, a stirring paddle and a precision filter tube as the bottom water, which just submerges the entire reactor mixer;

[0059] (3) Inject nitrogen gas into the sealed reaction kettle all the time, the nitrogen flow rate is 30L / min, start stirring at 150 rpm, adjust the pH of the bottom water to 12.6 with 8mol / L sodium hydroxide solution

[0060] (4) Start crystal n...

Embodiment 3

[0069] Ni 0.6 co 0.2 mn 0.2 (OH) 2 : d10=3.01um, d50=3.21um, d90=3.42um, tap density=1.63g / cm 3 , surface area=10.72m 2 / g, spherical or quasi-spherical.

[0070] (1) According to the molar ratio of Ni:Co:Mn 6:2:2, prepare a nickel-cobalt-manganese chloride mixed aqueous solution with a total concentration of 0.5mol / L, and prepare a sodium hydroxide aqueous solution with a concentration of 6mol / L. The prepared concentration is 8mol / L ammonia solution;

[0071] (2) Add the ammonia concentration of 0.16mol / L and pH=11.65 to the 100L reactor with a temperature-controlled water bath jacket, stirring paddle and precision filter tube as the bottom water. The bottom water is just right All stirring paddles without passing through the reactor;

[0072] (3) Inject nitrogen gas into the sealed reaction kettle all the time, the nitrogen gas flow rate is 1L / min, start stirring at 180 rpm, adjust the pH of the bottom water to 12.8 with 6mol / L sodium hydroxide solution

[0073] (4) ...

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Abstract

The invention relates to a high-density small-particle-size nickel-cobalt-manganese hydroxide and a preparing method thereof. The nickel-cobalt-manganese hydroxide and the preparing method thereof are characterized in that: the general chemical formula of the nickel-cobalt-manganese hydroxide is NixCoyMnz(OH)2, wherein the sum of the x, the y and the z is 1, the x is not more than 0.8 and not less than 0.3, the y is not more than 0.4 and not less than 0.1, and the z is not more than 0.4 and not less than 0.1. The nickel-cobalt-manganese hydroxide is provided, so that problems of small-particle-size nickel-cobalt-manganese hydroxides prepared by methods at present, namely nonuniform element distribution, poor particle appearance, loose surfaces, difficult particle size control, nonuniformity, low tap density, and the like are overcome. A complexing control crystallization coprecipitation method is adopted. By a special technical process of producing nucleuses, growing, and subjecting particles to continuous frictional collision under a continuously increased solid liquid ratio, an aqueous solution of a nickel-cobalt-manganese soluble salt and an aqueous sodium hydroxide solution are subjected to coprecipitation under complexing of ammonia to obtain the small-particle-size nickel-cobalt-manganese hydroxide having characteristics of uniform element distribution, good degree of sphericity, uniform particle size distribution and high tap density.

Description

technical field [0001] The invention relates to a nickel-cobalt-manganese hydroxide with high density and small particle size and a preparation method thereof. Background technique [0002] At present, the positive electrode materials used for lithium-ion batteries mainly include lithium cobalt oxide (LiCoO2), lithium nickel cobalt manganese oxide (ternary material, Li(Ni,Co,Mn)O2), lithium manganate, and lithium iron phosphate. Lithium nickel cobalt manganese oxide has gradually become the mainstream in the development and application of lithium-ion battery cathode materials due to its excellent comprehensive performance in terms of energy density, discharge voltage, cycle performance, thermal stability, self-discharge, and cost. It is widely used in the field of lithium-ion batteries for 3C digital electronic products, electric tools, electric bicycles and other small and medium-sized power lithium-ion batteries. In Japan and South Korea, lithium nickel cobalt manganese o...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 贾廷庆晁锋刚张晨文荣郑江峰沈立芳贾效旭
Owner 宁夏中色金辉新能源有限公司
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